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Grade 12 Chemistry entrance exam, 2018 E.C. (2026), version 4

Real questions from the Grade 12 university entrance exam in Chemistry, as students sat it in 2018 E.C. Every question comes with the correct answer and a worked explanation. The 2018 E.C. exam went out in several versions. This page holds version 4; the others are listed further down.

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  • Natural science stream

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  • 2018 E.C. (2026), version 4

    Exam year

  • 75 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

Modern atomic theory contradicts Dalton's atomic theory in stating that:

  1. A.When elements combine, their atoms unite in small whole number ratio to form compound.
  2. B.All substances are made up of very small particles called atoms.
  3. C.Atoms of different elements have different properties.
  4. D.Atom can split into smaller particles.
Show the answer and explanation

Answer: D Atom can split into smaller particles.

Why

Dalton's atomic theory stated that atoms are indivisible, whereas modern atomic theory shows that atoms can be split into subatomic particles (protons, neutrons, and electrons) and undergo nuclear division.

Question 2

The atomic nucleus was discovered with the help of an experiment called:_____.

  1. A.The deflection of cathode ray experiment.
  2. B.The Alpha particles scattering experiment.
  3. C.The discharge tube experiment.
  4. D.The oil drop experiment.
Show the answer and explanation

Answer: B The Alpha particles scattering experiment.

Why

Ernest Rutherford discovered the atomic nucleus through his famous alpha-particle scattering experiment, where he bombarded thin gold foil with alpha particles.

Question 4

Which experiment provide evidence that atom is mostly empty space and led to the discovery of the atomic nucleus?

  1. A.Millikan's oil drop experiment
  2. B.Bohr's hydrogen atom experiment
  3. C.Rutherford's gold foil experiment
  4. D.Thomson's cathode ray tube experiment
Show the answer and explanation

Answer: C Rutherford's gold foil experiment

Why

Rutherford's gold foil experiment showed that most alpha particles passed straight through the foil, indicating that the atom is mostly empty space, while a few were deflected at large angles by a dense, positively charged nucleus.

Question 5

An element has electron configuration of [Kr]5s²4d⁴. To which group and period respectively does the element belong in the Modern periodic table?

  1. A.Group IVB and period 4
  2. B.Group IIB and period 5
  3. C.Group VB and period 6
  4. D.Group VIB and period 5
Show the answer and explanation

Answer: D Group VIB and period 5

Why

The highest principal quantum number is 5, indicating that the element is in Period 5. The sum of the outer s and d electrons is 2 + 4 = 6, which places it in Group VIB (Group 6) of the transition metals.

Question 6

The characteristic similarities of elements in the same period is:

  1. A.They all have the same electron configuration
  2. B.They all have the same valence electrons
  3. C.They all have the same number of energy level
  4. D.They all have similar chemical properties
Show the answer and explanation

Answer: C They all have the same number of energy level

Why

Elements in the same period of the periodic table have their valence electrons in the same outermost energy level (or shell), meaning they have the same number of energy levels.

Question 7

Which One of the following statement is not true about Mendeleev's periodic table?

  1. A.Arranged elements in order of increasing atomic masses
  2. B.It was proposed in 1869 and predicted many new elements
  3. C.Wrong order of atomic masses would be observed
  4. D.The position of isotopes and noble gases are available
Show the answer and explanation

Answer: D The position of isotopes and noble gases are available

Why

Mendeleev's periodic table did not have designated positions for isotopes (which were undiscovered at the time and would disrupt the order by atomic mass) or noble gases (which were only discovered and added later).

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The other Chemistry papers of 2018 E.C.

2018 E.C. (2026)2018 E.C. (2026), version 12018 E.C. (2026), version 2

Chemistry papers from other years

2017 E.C. (2025)2017 E.C. (2025), round 12017 E.C. (2025), version 22016 E.C. (2024)2016 E.C. (2024), Tigray2016 E.C. model exam2015 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 2018 E.C. Chemistry entrance exam questions?

Yes. They come from the national university entrance exam in Chemistry that students sat in 2018 E.C. (2026). Our set holds 75 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 2018 E.C. paper as a PDF?

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