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Grade 12 Chemistry entrance exam, 2014 E.C. (2022)

Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2014 E.C. Every question comes with the correct answer and a worked explanation.

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  • Natural science stream

    Who sits it

  • 2014 E.C. (2022)

    Exam year

  • 58 questions with answers

    In this set

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Answer each question yourself before opening the answer. The explanations point to the exact place in the textbook, so you know which page to reread when you miss one.

Question 1

What is the difference between reversible and irreversible reactions?

  1. A.In reversible reactions, the reaction goes to completion.
  2. B.In irreversible reactions, there is a mixture of products and reactants.
  3. C.In reversible reactions, there is equilibrium between reactants and products.
  4. D.In irreversible reactions, there is equilibrium between reactants and products.
Show the answer and explanation

Answer: C In reversible reactions, there is equilibrium between reactants and products.

Why

In a reversible reaction, reactants and products coexist in a state of dynamic chemical equilibrium where the forward and reverse reactions occur at equal rates, unlike irreversible reactions which go to completion.

Question 2

Consider the reactions all given below are in gaseous state. For which of the following reactions is K p less than K c ?

  1. A.N 2 O 4 ⇌ 2NO 2
  2. B.2SO 2 + O 2 ⇌ 2SO 3
  3. C.2H 2 ⇌ H 2 + I 2
  4. D.N 2 + O 2 ⇌ 2NO
Show the answer and explanation

Answer: B 2SO 2 + O 2 ⇌ 2SO 3

Why

The relationship between the equilibrium constants is given by Kp=Kc(RT)ΔnK_p = K_c(RT)^{\Delta n}. For reaction B (2SO2+O2⇌2SO32SO_2 + O_2 \rightleftharpoons 2SO_3), the change in moles of gas is Δn=2−3=−1\Delta n = 2 - 3 = -1, which makes Kp<KcK_p < K_c.

Question 4

The general formula for saturated monocarboxylic acids is

  1. A.RCOOH
  2. B.RCOR
  3. C.RCHO
  4. D.ROR
Show the answer and explanation

Answer: A RCOOH

Why

Saturated monocarboxylic acids (also known as alkanoic acids) contain one carboxyl group (-COOH) attached to an alkyl group, represented by the general formula RCOOH.

Question 5

What is enthalpy change? It is

  1. A.the amount of heat given out or absorbed in a reaction at constant pressure and volume
  2. B.the amount of heat absorbed in a reaction
  3. C.the amount of heat given out in a reaction
  4. D.the amount of heat given out or absorbed in a reaction at constant pressure
Show the answer and explanation

Answer: D the amount of heat given out or absorbed in a reaction at constant pressure

Why

Enthalpy change (ΔH\Delta H) is defined as the amount of heat energy absorbed or released by a chemical system during a process occurring at constant pressure (qp=ΔHq_p = \Delta H).

Question 6

What is oxidation? Oxidation is

  1. A.the addition of electron(s) to the oxidizing agent
  2. B.the reduction of the oxidation state of the oxidizing agent
  3. C.the addition of hydrogen to a substance and the removal of oxygen from a substance
  4. D.the loss of electrons by a species, accompanied by an increase in oxidation number
Show the answer and explanation

Answer: D the loss of electrons by a species, accompanied by an increase in oxidation number

Why

Oxidation is defined as the process in which an atom, ion, or molecule loses one or more electrons, which corresponds to an increase in its oxidation number.

Question 7

What is meant by preferential discharge, if a number of ions are present in a solution? It means that the one which requires

  1. A.highest energy will be liberated first at a given electrode
  2. B.highest energy will be liberated last at a given electrode
  3. C.least energy will be liberated first at a given electrode
  4. D.least energy will be liberated last at a given electrode
Show the answer and explanation

Answer: C least energy will be liberated first at a given electrode

Why

Preferential discharge refers to the selective reduction or oxidation of ions at an electrode during electrolysis; the ion that requires the least energy to gain or lose electrons is discharged first.

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Chemistry papers from other years

2018 E.C. (2026)2017 E.C. (2025)2016 E.C. (2024)2015 E.C. (2023)2013 E.C. (2021)2012 E.C. (2020)2011 E.C. (2019)2010 E.C. (2018)2009 E.C. (2017)2008 E.C. (2016)2007 E.C. (2015)2006 E.C. (2014)2005 E.C. (2013)

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Are these the real 2014 E.C. Chemistry entrance exam questions?

Yes. They come from the national university entrance exam in Chemistry that students sat in 2014 E.C. (2022). Our set holds 58 of its questions, each with its answer and an explanation that points back to the textbook.

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Can I download the Chemistry 2014 E.C. paper as a PDF?

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