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Grade 12 Chemistry entrance exam, 2016 E.C. (2024)

Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2016 E.C. Every question comes with the correct answer and a worked explanation.

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  • Natural science stream

    Who sits it

  • 2016 E.C. (2024)

    Exam year

  • 72 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 are the molecular formulae of an alkene and alkyne containing seven carbon atoms, respectively?

  1. A.C 7 H 14 and C 7 H 12
  2. B.C 7 H 16 and C 7 H 14
  3. C.C 7 H 14 and C 7 H 16
  4. D.C 7 H 12 and C 7 H 14
Show the answer and explanation

Answer: A C 7 H 14 and C 7 H 12

Why

Alkenes follow the general formula CnH2n (so for n=7, C7H14) and alkynes follow CnH2n-2 (so for n=7, C7H12).

Question 2

Which of the following is the CORRECT method of preparation of alkenes in the laboratory?

  1. A.Alkylation of sodium acetylide with a primary alkyl halide.
  2. B.Heating of sodium salt of an organic acid with soda lime.
  3. C.Reaction of halogenated alkane with sodium.
  4. D.Dehydration of alcohols with concentrated sulfuric acid.
Show the answer and explanation

Answer: D Dehydration of alcohols with concentrated sulfuric acid.

Why

Dehydration of alcohols using a strong acid catalyst like concentrated sulfuric acid is a standard laboratory method to prepare alkenes.

Question 4

Which of the following is the product of fractional distillation of crude oil?

  1. A.Producer gas
  2. B.Naphthalene
  3. C.Water gas
  4. D.Kerosene
Show the answer and explanation

Answer: D Kerosene

Why

Kerosene is a major fraction obtained directly from the fractional distillation of crude oil, whereas producer gas and water gas are manufactured from coal or coke.

Question 5

What is the molecular formula and IUPAC name of a saturated monocarboxylic acid having six carbon atoms?

  1. A.C 5 H 11 COOH, heptanoic acid
  2. B.C 6 H 13 COOH, heptanoic acid
  3. C.C 5 H 11 COOH, hexanoic acid
  4. D.C 6 H 13 COOH, hexanoic acid
Show the answer and explanation

Answer: C C 5 H 11 COOH, hexanoic acid

Why

A saturated monocarboxylic acid with six carbon atoms has the IUPAC name hexanoic acid, and its molecular formula is C5H11COOH (since one of the six carbons is in the carboxyl group).

Question 7

During summer, the average value for the temperature measured in a certain chemistry laboratory is 298.15 K. How many decimal places are there in the measured value?

  1. A.5
  2. B.3
  3. C.2
  4. D.1
Show the answer and explanation

Answer: C 2

Why

The measured value 298.15 K has two digits after the decimal point, meaning there are 2 decimal places.

Question 8

Which of the following is the CORRECT Lewis electron -dot symbol of MgO? (Atomic number: Mg = 12 and O = 8)

  1. A.Mg + : .. O : .. 2-
  2. B.Mg +2 : .. O : .. -
  3. C.Mg + : .. O : .. -
  4. D.Mg +2 : .. O : .. 2-
Show the answer and explanation

Answer: D Mg +2 : .. O : .. 2-

Why

Magnesium oxide is an ionic compound where Mg transfers its 2 valence electrons to O, forming Mg2+ and an oxide ion (O2-) with a complete octet of 8 valence electrons.

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Chemistry papers from other years

2018 E.C. (2026)2017 E.C. (2025)2015 E.C. (2023)2014 E.C. (2022)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 2016 E.C. Chemistry entrance exam questions?

Yes. They come from the national university entrance exam in Chemistry that students sat in 2016 E.C. (2024). Our set holds 72 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 2016 E.C. paper as a PDF?

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