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Grade 12 Chemistry entrance exam, 2011 E.C. (2019)

Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2011 E.C. Every question comes with the correct answer and a worked explanation.

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  • Natural science stream

    Who sits it

  • 2011 E.C. (2019)

    Exam year

  • 77 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 aspect of the modern view of atomic structure was proved by Rutherford's gold foil experiment?

  1. A.The existence of the nucleus.
  2. B.The charge on an electron.
  3. C.The charge on an α\alpha particle.
  4. D.The existence of electrons.
Show the answer and explanation

Answer: A The existence of the nucleus.

Why

Rutherford's gold foil experiment showed that alpha particles could be deflected at large angles, proving the existence of a dense, positively charged nucleus at the center of the atom.

Question 2

Which of these compounds is propanoic acid?

  1. A.CH₃CH₂COOCH₃
  2. B.CH₃CH₂COH
  3. C.CH₃CH₂CH₂OH
  4. D.CH₃CH₂COOH
Show the answer and explanation

Answer: D CH₃CH₂COOH

Why

Propanoic acid is a three-carbon carboxylic acid with the molecular formula CH––CH––COOH.

Question 3

Fats and oils can be classified as___________.

  1. A.carbohydrates
  2. B.acids
  3. C.esters
  4. D.alcohols
Show the answer and explanation

Answer: C esters

Why

Fats and oils are triglycerides, which are esters formed from glycerol (a triol) and three fatty acid molecules.

Question 4

What does it mean by Δ\DeltaH = negative for a given process?

  1. A.The process is endothermic
  2. B.The process is exothermic
  3. C.The process is adiabatic
  4. D.The process is equithermic
Show the answer and explanation

Answer: B The process is exothermic

Why

A negative change in enthalpy (Δ\DeltaH < 0) indicates that heat is released to the surroundings, which is the definition of an exothermic process.

Question 5

The oxidation state of chlorine in HClO₄ is:

  1. A.+1
  2. B.+3
  3. C.+5
  4. D.+7
Show the answer and explanation

Answer: D +7

Why

In HClO₄, hydrogen has an oxidation state of +1 and oxygen is -2. Setting the sum equal to zero: (+1) + Cl + 4(-2) = 0, which gives Cl = +7.

Question 6

Which substance is used to lower the melting point of aluminum oxide ore in the electrolytic extraction of aluminum?

  1. A.Cryolite
  2. B.Bauxite
  3. C.Hematite
  4. D.Magnetite
Show the answer and explanation

Answer: A Cryolite

Why

Cryolite (Na₃AlF₆) is added to alumina (Al₂O₃) to lower its melting point from about 2050°C to around 950°C, making the electrolytic extraction of aluminum energy-efficient.

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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)2014 E.C. (2022)2013 E.C. (2021)2012 E.C. (2020)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 2011 E.C. Chemistry entrance exam questions?

Yes. They come from the national university entrance exam in Chemistry that students sat in 2011 E.C. (2019). Our set holds 77 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 2011 E.C. paper as a PDF?

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