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Unofficial practice · EUEE

2017 E.C. Chemistry EUEE past paper

67 questions · 2017 E.C. / 2025 G.C. · Natural stream · unofficial

Unofficial practice for the 2017 E.C. / 2025 G.C. Chemistry Ethiopian University Entrance Exam (EUEE / matric). 67 question stems from the Abrari bank are listed below. Not an official Ministry, EAES, MoLS, or OCACC paper.

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Unofficial EUEE past-paper items. Not an official key.

1 / 5chemistryIndustrial chemistry / glass

Which type of glass is made by heating a mixture of silica, sodium carbonate and limestone?

Unofficial practice. Abrari is an independent study aid and is not affiliated with, endorsed by, or an official product of the Ethiopian Ministry of Education (MoE), EAES, MoLS, or OCACC. Answers are Abrari keys, not an official marking scheme.

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Stems are visible for study. Worked solutions stay inside each item and are unofficial.

Q1 · Industrial chemistry / glass

Which type of glass is made by heating a mixture of silica, sodium carbonate and limestone?
  1. A. Pyrex glass
  2. B. Soda-lime
  3. C. Borosilicate
  4. D. Quartz
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q2 · Electrochemistry / cell potential

Consider the following galvanic cell: When the Zn strip was connected to metal 'B' at 25°C, the voltmeter shows 0.51 V. Which of the following is the standard reduction potential of metal 'B'? (EZn2+/Zn∘=−0.76E^\circ_{\mathrm{Zn}^{2+}/\mathrm{Zn}} = -0.76 V)

This item uses a figure in the original paper (not redrawn here).

  1. A. EB2+/B∘=1.27E^\circ_{\mathrm{B}^{2+}/\mathrm{B}} = 1.27 V
  2. B. EB2+/B∘=0.25E^\circ_{\mathrm{B}^{2+}/\mathrm{B}} = 0.25 V
  3. C. EB2+/B∘=−1.27E^\circ_{\mathrm{B}^{2+}/\mathrm{B}} = -1.27 V
  4. D. EB2+/B∘=−0.25E^\circ_{\mathrm{B}^{2+}/\mathrm{B}} = -0.25 V
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q3 · Polymers

Which of the following polymer is used to make ropes, clothes, hair combs and stockings?
  1. A. Bakelite
  2. B. Teflon
  3. C. Nylon
  4. D. Perspex
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q4 · Industrial chemistry / catalysts

Which of the following catalyst is used in the Ostwald process for the production of HNO3HNO_3?
  1. A. CuO
  2. B. Fe
  3. C. V2O5V_2O_5
  4. D. Pt
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q5 · Reaction rate / factors

Which of the following factors does NOT affect the rate of a chemical reaction having solid reactants?
  1. A. Volume of reaction vessel
  2. B. Physical state of reactants
  3. C. Temperature of reaction
  4. D. Concentration of reactants
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q8 · Atomic structure / EM radiation

A mineral absorbs purple light of frequency 7.11×1014 Hz7.11 \times 10^{14}\ \text{Hz}. What is the wavelength (in nm) of the absorbed light? (c=3.00×108 m/sc = 3.00 \times 10^8\ \text{m/s})
  1. A. 314.5 nm
  2. B. 421.9 nm
  3. C. 237.5 nm
  4. D. 184.4 nm
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q9 · Atomic structure / energy transitions

Why do atoms absorb energy when their electrons undergo transitions from a lower energy to a higher energy level? This is because
  1. A. The electrons of the atoms absorb energy when they go from higher to lower energy.
  2. B. The electrons of the atoms do not have allowable energy levels.
  3. C. The electrons of the atoms move from one orbit of higher radius to another one having lower radius.
  4. D. The electrons of the atoms move from one orbit of lower radius to another one having larger radius.
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q10 · Quantum numbers

What are the quantum numbers for the 5s orbital?
  1. A. n=5, l=0, ml=0, ms=±12n=5,\ l=0,\ m_l=0,\ m_s=\pm\frac{1}{2}
  2. B. n=5, l=2, ml=−2, ms=±12n=5,\ l=2,\ m_l=-2,\ m_s=\pm\frac{1}{2}
  3. C. n=5, l=1, ml=−2, ms=±12n=5,\ l=1,\ m_l=-2,\ m_s=\pm\frac{1}{2}
  4. D. n=5, l=0, ml=−1, ms=±12n=5,\ l=0,\ m_l=-1,\ m_s=\pm\frac{1}{2}
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q11 · Quantum numbers / Pauli

Which of the following is CORRECT about the set of quantum numbers assigned to the two electrons of the helium atom?
  1. A. The magnetic quantum numbers of both electrons are different.
  2. B. The second electron occupies the same orbital as the first with the opposite spin quantum number.
  3. C. The second electron occupies the same orbital as the first with the same spin quantum number.
  4. D. Both electrons have the same four quantum numbers.
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q12 · Chemical bonding

What is the bond formed between two or more atoms by sharing of electrons?
  1. A. Valence bond
  2. B. Covalent bond
  3. C. Metallic bond
  4. D. Ionic bond
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q13 · Intermolecular forces

Which statement below CORRECTLY describes dipole-dipole forces? It is the force that exists
  1. A. between polar and non-polar molecules.
  2. B. between non-polar molecules.
  3. C. between polar molecules.
  4. D. in all
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q14 · Intermolecular forces

Comparing the forces between molecules of similar molar masses, which one of the following produces the weakest force?
  1. A. Van der Waals forces.
  2. B. Ionic forces.
  3. C. Hydrogen bonding.
  4. D. Covalent bonds
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q15 · Environmental chemistry / greenhouse effect

Which of the following is NOT true about greenhouse effect and greenhouse gases?
  1. A. The greater the percentage of greenhouse gases in the atmosphere, the cooler the earth should be.
  2. B. Oxygen (O₂) and nitrogen (N₂) are transparent to infrared radiation.
  3. C. Carbon dioxide and water vapor are greenhouse gases.
  4. D. Greenhouse effect is the trapping of the infrared radiation by certain gases in the atmosphere
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q16 · Natural resources

In which of the following is the type of natural resource and the given example CORRECTLY paired?
  1. A. Non-Renewable Resources; water
  2. B. Non-Renewable Resources; animal wool
  3. C. Renewable resources; crops
  4. D. Renewable resources; copper
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q17 · Acids and bases / Bronsted-Lowry

Which of the following compound is a Bronsted-Lowry base?
  1. A. $\ce{H2S}$
  2. B. $\ce{HCl}$
  3. C. $\ce{NH3}$
  4. D. $\ce{BF3}$
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q18 · Electrolysis

In an activity during laboratory session a small amount of lead bromide ($\ce{PbBr2}$) crystals were placed in a beaker. Two electrodes are inserted until they are in contact with the $\ce{PbBr2}$ crystals. When the $\ce{PbBr2}$ crystals in the beaker are gently heated, which of the following will be observed?
  1. A. Lead (II) ion is oxidized at the cathode
  2. B. Lead (II) ion is reduced at the anode
  3. C. Bromide ion is oxidized at the cathode
  4. D. Bromine gas is evolved at the anode
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q19 · Environmental chemistry / pollution

What is the name given to the pollution caused by the dumping of non-biodegradable wastes into the environment?
  1. A. Water pollution
  2. B. Sound pollution
  3. C. Land pollution
  4. D. Air pollution
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q20 · Metallurgy / steel

What is the purpose of the conversion of pig iron to steel?
  1. A. To decrease the concentration of iron in the pig iron
  2. B. To increase the concentration of iron in the pig iron
  3. C. To remove impurities by reduction
  4. D. To remove impurities by oxidation
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q21 · Laws of chemical combination

Which of the following statements CORRECTLY describes the law of conservation of mass?
  1. A. Pure compounds always contain the elements in the same percentage by mass.
  2. B. A particular compound is composed of the same elements in the same parts by mass.
  3. C. Mass is neither created nor destroyed during a chemical reaction.
  4. D. The total mass of substances varies during a chemical reaction.
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q22 · Gas laws / density

What is the density of methane (CH4CH_4) at a pressure of 900 torr and a temperature of 25°C? (R=0.082R=0.082 atm. L/mol. K, 1 atm = 760 torr)
  1. A. 9.2
  2. B. 1.25
  3. C. 0.92
  4. D. 0.78
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q23 · Graham's law of diffusion

It takes 2.25 minutes for 0.02 mol of He to diffuse. How long will it take to diffuse for the same amount of methane gas, CH4CH_4? (M.wt of He = 4 g/mol, CH4CH_4 = 16 g/mol)
  1. A. 6 min
  2. B. 4.5 minutes
  3. C. 2.25 min
  4. D. 1.25 min
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q24 · Reaction rate / definition

Which one of the following statement CORRECTLY defines rate of reaction? The rate of a reaction is
  1. A. the measure of the rate of diffusion of different gases inside a tube.
  2. B. the study of necessary mechanisms occurred in a chemical reaction.
  3. C. the measure of the amount of energy change in a chemical reaction.
  4. D. the changes in concentration of reactants or products per unit time.
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q26 · Balancing equations / stoichiometry

Aluminum reacts with oxygen to form aluminum oxide. What is the coefficient of aluminum after balancing the reaction?
  1. A. 8
  2. B. 6
  3. C. 4
  4. D. 2
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q27 · Ionic compounds / properties

What property of an ionic compound can be investigated by heating it in a crucible?
  1. A. Crystallization point
  2. B. Malleability
  3. C. Solubility
  4. D. Melting point
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q28 · Isotopes / average atomic mass

Silver has two known isotopes, 107^{107}Ag and 108^{108}Ag with their percent abundance of 52% and 48%, respectively. What is the average atomic mass of silver?
  1. A. 108.86
  2. B. 107.48
  3. C. 108.06
  4. D. 107.89
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q29 · Ions / cation formation

Which reaction scheme below illustrates the formation of a cation?
  1. A. Mg2++2e−→MgMg^{2+} + 2e^- \rightarrow Mg
  2. B. S+2e−→S2−S + 2e^- \rightarrow S^{2-}
  3. C. 2Cl−→Cl2+2e−2Cl^- \rightarrow Cl_2 + 2e^-
  4. D. Na→Na++e−Na \rightarrow Na^+ + e^-
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q30 · Titration / equivalence vs end point

Which statement distinguishes equilibrium point from end point in acid-base titration?
  1. A. End point is a point at which the indicator changes color whereas equivalence point is the point where an acid has completely reacted with a base.
  2. B. Equivalence point is a point at which the indicator changes color whereas end point is the point where an acid has completely reacted with a base.
  3. C. Equivalence point is a point at which reactants start to melt whereas end point is the point where products start to freeze.
  4. D. Equivalence point is a point at which reactants start to evaporate whereas end point is the point where a product starts to condense
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q31 · Electrolysis / Faraday's law

Which one is the mathematical expression for Faraday's first law of electrolysis?
  1. A. m=MItnFm = \frac{MIt}{nF}
  2. B. m=MPVRTm = \frac{MPV}{RT}
  3. C. M=nV(liter)M = \frac{n}{V(\text{liter})}
  4. D. m1m2=E1E2\frac{m_1}{m_2} = \frac{E_1}{E_2}
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q32 · Industrial chemistry / manufacturing

Which of the following describes the process of manufacturing valuable products in industries?
  1. A. Manufacturing industry uses only inorganic chemicals in the production of valuable products.
  2. B. Carry out unwanted reaction of a material that result in the dissolution or consumption of the material.
  3. C. Discharging of a solid, liquid or gaseous substance into an environment that causes unwanted changes.
  4. D. Designing to produce a desired output from raw materials using energy through different steps.
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q33 · Acid-base equilibrium / percent ionization

For the dissociation of HNO2HNO_2: HNO2(aq)⇌NO2−(aq)+H+(aq)HNO_2(aq) \rightleftharpoons NO_2^-(aq) + H^+(aq). What is the percent ionization of a 0.5 M solution of HNO2HNO_2? (KaK_a of HNO2HNO_2 = 7.1×10−47.1 \times 10^{-4})
  1. A. 9.1%
  2. B. 3.8%
  3. C. 1.8%
  4. D. 0.2%
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q34 · Redox / oxidizing agent

Which of the following reaction shows the action of H2SO4H_2SO_4 as oxidizing agent?
  1. A. Mg(s)+2H2SO4(aq)→3MgSO4(aq)+(NH2)2SO4(aq)Mg(s) + 2H_2SO_4(aq) \rightarrow 3MgSO_4(aq) + (NH_2)_2SO_4(aq)
  2. B. Cu(s)+2H2SO4(aq)→CuSO4(aq)+SO2(g)+2H2O(l)Cu(s) + 2H_2SO_4(aq) \rightarrow CuSO_4(aq) + SO_2(g) + 2H_2O(l)
  3. C. 2KOH(aq)+H2SO4(aq)→K2SO4(aq)+2H2O(l)2KOH(aq) + H_2SO_4(aq) \rightarrow K_2SO_4(aq) + 2H_2O(l)
  4. D. SO3(g)+H2O(l)→H2SO4(aq)SO_3(g) + H_2O(l) \rightarrow H_2SO_4(aq)
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q35 · Weak base / Kb calculation

A 0.47 M aqueous solution of a weak base has a pOH of 2. What is KbK_b for the weak base?
  1. A. 4.4×10−14.4 \times 10^{-1}
  2. B. 1.0×10−21.0 \times 10^{-2}
  3. C. 3.14×10−33.14 \times 10^{-3}
  4. D. 2.17×10−42.17 \times 10^{-4}
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q36 · Electrochemistry / galvanic cell

A student was given a standard Zn(s)|Zn2+Zn^{2+}(aq) half-cell and another half-cell containing copper immersed in 1.00 M CuSO4CuSO_4(aq). When the Zn was connected as the anode at 25°C, the cell potential reading on the voltmeter shows 1.1 V. Which of the following is NOT correct regarding the cell potential measurement?
  1. A. Electrons travel through the external circuit from copper cathode to the zinc anode.
  2. B. The zinc electrode was dissolved and the blue color CuSO₄ solution would fade.
  3. C. The circuit is completed inside the cell by migration of ions through the salt bridge.
  4. D. The mass of copper was increased during the cell potential measurement.
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q39 · Acidic oxides

Which of the following properties is the property of an acidic oxide? An acidic oxide reacts with
  1. A. Water to form acids.
  2. B. Salts to form acids.
  3. C. Basic oxides to form hydroxides and water.
  4. D. Bases to form basic hydroxide and water.
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q40 · Acids / weak acid

What is the name given to an acid that dissociates (ionizes) only to a slight extent in aqueous solution?
  1. A. Strong acid
  2. B. Dilute acid
  3. C. Concentrated acid
  4. D. Weak acid
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q41 · pH scale

Solutions can be classified based upon their pH values. What is a solution whose pH value is 13?
  1. A. Acidic solution
  2. B. Amphoteric solution
  3. C. Basic solution
  4. D. Neutral solution
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q42 · Reactions of metals / litmus

During laboratory class, a student placed clean water in a beaker and added pieces of calcium metal using tongs. After the reaction is completed, he/she tested the solution using red litmus paper. Which of the following will be observed?
  1. A. The litmus paper turns to red.
  2. B. The litmus paper turns to blue.
  3. C. The litmus paper turns to colorless.
  4. D. The litmus paper maintains its color.
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q43 · EM radiation relationships

Which of the following statements CORRECTLY describes the relationship among wavelength, frequency and speed in electromagnetic radiation?
  1. A. As the wavelength decreases, the frequency increases.
  2. B. As the wavelength increases, the frequency increases.
  3. C. As the frequency increases, the speed of light decreases.
  4. D. As the wavelength decreases, the speed of light increases.
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q44 · Intermolecular forces / boiling point

Which of the following organic compounds has the highest boiling point?
  1. A. Ethene
  2. B. Ethanol
  3. C. Ethane
  4. D. Ethanal
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q45 · Acids and bases / Lewis base

What is a Lewis base? It is
  1. A. Proton acceptor
  2. B. Proton donor
  3. C. Electron pair donor
  4. D. Electron pair acceptor
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q46 · Percent ionization expression

Given the following information: CH₃COOH (aq) ⇌ CH₃COO⁻ (aq) + H⁺ (aq) with initial concentration of CH₃COOH = 0.2 mol/L, change -X/+X/+X, equilibrium 0.2-X / X / X. Which of the following expressions represents the percent ionization of CH₃COOH?
  1. A. (x/0.2)100%
  2. B. ((0.2-x)/0.2)100%
  3. C. (x/(0.2-x))100%
  4. D. ((0.2)/x)100%
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q47 · Periodic table / classification

Scandium (Sc) has the electron configuration [Ar] 4s2^23d1^1. To which group of elements does it belong to?
  1. A. Transition elements
  2. B. Representative elements
  3. C. Nonmetals
  4. D. Inner transition elements
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q48 · Ionic compounds / melting point

A student carried out an experiment to determine the melting points of NaCl and CuCl2_2. He/she added 0.2 g of NaCl and CuCl2_2 into two different test tubes and heated both tubes simultaneously using a Bunsen burner. Which of the following statements is CORRECT regarding the melting point of NaCl and CuCl2_2?
  1. A. The melting point of NaCl is higher than that of CuCl2_2.
  2. B. The melting point of NaCl is lower than that of CuCl2_2.
  3. C. Both NaCl and CuCl2_2 will not melt.
  4. D. Both NaCl and CuCl2_2 will melt at the same time.
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q49 · Hydrogen bonding

What is the cause of unusual high boiling points of HF, H2_2O and NH3_3?
  1. A. Induced dipole forces
  2. B. Dipole-Dipole forces
  3. C. Ion-dipole forces
  4. D. Hydrogen bonding
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q51 · Graham's law of diffusion

If the rate of diffusion of a certain unknown gas is half times the rate of diffusion of helium, what will be the molar mass of the unknown gas? (Atomic mass of He= 4.0 g/mole)
  1. A. 8.0 g/mole
  2. B. 2.0 g/mole
  3. C. 32.0 g/mole
  4. D. 16.0 g/mole
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q52 · Laboratory / boiling chips

A student added boiling chips into a beaker of water while carrying out an activity to determine the boiling point of water. Why do you think the boiling chips are necessary?
  1. A. To speed up the rate of evaporation
  2. B. To ensure smooth rate of evaporation
  3. C. To reach the boiling point with less consumption of heat
  4. D. To maintain constant temperature and pressure
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q53 · Oxidation number

What is the oxidation number of manganese in KMnO4_4?
  1. A. +6
  2. B. +5
  3. C. +8
  4. D. +7
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q54 · Organic chemistry / isomers

2-methyl-1-butene is one of the isomers of C5_5H10_{10}. Which of the following is the CORRECT structural formula of this isomer?
  1. A. CH3_3-CH2_2-C(CH3_3)=CH2_2
  2. B. CH3_3-CH(CH3_3)-CH=CH2_2
  3. C. CH3_3-CH=CH-CH2_2-CH3_3
  4. D. CH3_3-C(CH3_3)=CH-CH3_3
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q55 · Organic chemistry / synthesis

Which of the following organic compounds is used for the production of 1, 2-ethanediol?
  1. A. Ethane
  2. B. Ethene
  3. C. Ethanol
  4. D. Ethyne
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q56 · Organic chemistry / natural gas

Which of the following is the main constituent of natural gas?
  1. A. Butane
  2. B. Ethane
  3. C. Methane
  4. D. Propane
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q58 · Organic chemistry / dry cleaning

In order to avoid the decrease in quality of some clothes after washing with water, which of the following chemicals is used for dry cleaning?
  1. A. CH2_2Cl2_2
  2. B. CH4_4
  3. C. C2_2Cl4_4
  4. D. C2_2H4_4
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q59 · Molecular geometry / VSEPR

The molecule of BF3_3 has both bonding and lone pair of electrons. Based upon these electrons, which one is the CORRECT molecular geometry of the molecule of BF3_3?
  1. A. Square pyramidal
  2. B. Square planar
  3. C. Trigonal bipyramidal
  4. D. Trigonal planar
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q60 · Laws of chemical combination

Which law governs the fact that the ratio of the amount of hydrogen to oxygen by weight will be the same in a drop of water and a lake of water?
  1. A. Law of conservation of mass
  2. B. Law of relative composition
  3. C. Law of definite proportion
  4. D. Law of multiple proportions
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q61 · Chemical equilibrium / characteristics

Which statement below CORRECTLY describes the characteristics of chemical equilibrium?
  1. A. A reaction stops if sufficient amount of time is given.
  2. B. A reaction stops when it reaches equilibrium.
  3. C. A new substance or substances are formed when equilibrium is attained.
  4. D. The rates of the forward and reverse reactions are equal.
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q62 · Organic chemistry / hydrocarbons

What is the name given to compounds of carbon and hydrogen containing multiple bonds?
  1. A. Aromatic hydrocarbons
  2. B. Aliphatic hydrocarbons
  3. C. Unsaturated hydrocarbons
  4. D. Saturated hydrocarbons
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q63 · Green chemistry / atom economy

The following reaction can be used for the synthesis of CH3_3CH2_2CH2_2CH3_3 as a desired product: CH3_3CH2_2CHBrCH3_3 + CH3_3S−^{-} → CH3_3CH2_2CH2_2CH3_3 + CH3_3SH + Br−^{-}. Which of the following is the atom economy for the above reaction? (Atomic masses: H=1; C=12; S=32 and Br=80)
  1. A. 48%
  2. B. 30.43%
  3. C. 80%
  4. D. 56%
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q64 · Applied chemistry / food preservation

Which of the following process involves preventing the growth of bacteria, fungi and reducing the oxidation of fats?
  1. A. Tanning
  2. B. Haber-Bosch
  3. C. Contact
  4. D. Food preservation
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q65 · Electrolysis / molten NaCl

Which of the following is the overall reaction for electrolysis of molten NaCl?
  1. A. Na+^{+}(l) + Cl−^{-}(l) → Na(l) + 12\frac{1}{2}Cl2_2(g)
  2. B. Na+^{+}(l) + 12\frac{1}{2}Cl2_2(g) → Na+^{+}(l) + Cl−^{-}(l)
  3. C. H2_2(g) + 12\frac{1}{2}O2_2(g) → H2_2O(g)
  4. D. H2_2O(g) → H2_2(g) + 12\frac{1}{2}O2_2(g)
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q66 · Electrolysis / dilute H2SO4

Which of the following occur during the electrolysis of dilute H2_2SO4_4?
  1. A. The overall reaction is: H2_2(g) + 12\frac{1}{2}O2_2(g) → H2_2O(g)
  2. B. SO42−_4^{2-} is discharged at the anode.
  3. C. A basic solution is formed
  4. D. H+^{+} is discharged at the negative electrode
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q67 · Redox / classification

Which statement below CORRECTLY distinguishes redox and non-redox reactions?
  1. A. Reduction occurs in redox reactions and oxidation takes place in non-redox reactions.
  2. B. Electrons are transferred in redox reactions but not in non-redox reactions.
  3. C. Acid-base reactions can be considered as both redox and non-redox reactions.
  4. D. Oxidation number remains the same in both redox and non-redox reactions
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q68 · Chemical equilibrium / expression

Given the reaction: C(s) + CO2_2(g) ⇌ 2CO(g). What is the equilibrium constant expression for the reaction?
  1. A. [CO]2^{2}/[CO2_2]
  2. B. [CO]2^{2}/[C][CO2_2]
  3. C. [C][CO2_2]/[CO]2^{2}
  4. D. [CO2_2]2^{2}/[C]
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q69 · States of matter

Which of the following pair of substances can be considered as examples of the liquid state of matter at room temperature and 1 atm pressure?
  1. A. Water and carbon dioxide
  2. B. Carbon and mercury
  3. C. Carbon and carbon monoxide
  4. D. Water and mercury
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q70 · Gas laws

Which gas law describes the behavior of gases using the variables: temperature, volume, pressure and number of moles?
  1. A. Boyle's law
  2. B. Ideal gas law
  3. C. Combined gas law
  4. D. Avogadro's law
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q71 · Atomic structure / subatomic particles

Which one of the following CORRECTLY shows the relative charges of an electron, proton and neutron, respectively?
  1. A. 0, -1, +1
  2. B. 0, +1, -1
  3. C. -1, 0, +1
  4. D. -1, +1, 0
Worked solutionUnofficial

Unofficial keyed letter D. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q72 · Atomic structure / Bohr model

Which statement below CORRECTLY describes the Bohr's model of an atom?
  1. A. Electrons and neutrons are found in the nucleus.
  2. B. Protons and electrons are found in the nucleus.
  3. C. Electrons move in circular orbits around the nucleus.
  4. D. Protons move in circular orbits around the nucleus.
Worked solutionUnofficial

Unofficial keyed letter C. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q73 · Periodic table / periodicity

Which statement below CORRECTLY describes periodicity? Periodicity is
  1. A. a row in the Periodic Table which contains elements with same number of shells.
  2. B. a regular repetition of chemical and physical properties in the Periodic Table.
  3. C. a column in the Periodic Table which contains elements with similar chemical properties.
  4. D. a measure of electronegativity which runs from least electronegative to most electronegative elements.
Worked solutionUnofficial

Unofficial keyed letter B. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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Q74 · Hydrogen bonding

Which statement below CORRECTLY expresses hydrogen bonding? It is formed by bonding
  1. A. a hydrogen atom to an element such as oxygen.
  2. B. a hydrogen atom to an element such as sodium.
  3. C. two hydrogen atoms with unequal sharing of electrons.
  4. D. two hydrogen atoms with equal sharing of electrons.
Worked solutionUnofficial

Unofficial keyed letter A. A full worked solution is not published for this item yet.

Unofficial — solved by Abrari, not an official EAES key.

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