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JAMB Chemistry Past Questions 2021

10 questions from the JAMB 2021 Chemistry paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2021Question 1 · Acids, Bases, and Salts
The process by which salt and water reacted in a limited way to form an acid or a base is?
  1. A.Neutral process
  2. B.Basic acidic process
  3. C.Hydrolysis
  4. D.Sublimation
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Answer: C. Hydrolysis

The reaction of a salt with water in a limited way to produce an acidic or basic solution is called (salt) hydrolysis.

JAMB 2021Question 2 · Atomic Structure and Chemical Bonding
The maximum electron in N shell is?
  1. A.2
  2. B.8
  3. C.18
  4. D.32
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Answer: D. 32

Maximum electrons in the N shell (n=4) = = 2(16) = 32.

JAMB 2021Question 3 · Atomic Structure and Chemical Bonding
The nucleus of an atom consists of?
  1. A.Electrons and neutrons
  2. B.Electrons and protons
  3. C.Protons and neutrons
  4. D.None of the above
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Answer: C. Protons and neutrons

The nucleus of an atom consists of protons and neutrons.

JAMB 2021Question 4 · Chemistry of Metals
The process or act of extracting a metal from its ore and refining it is called?
  1. A.Extraction
  2. B.Metal mining
  3. C.Mettallurgy
  4. D.Prospecting
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Answer: C. Mettallurgy

The extraction of a metal from its ore, followed by refining, is called metallurgy.

JAMB 2021Question 5 · Chemistry of Non-metals and Gases
A binary compound of oxygen with another element is referred to as?
  1. A.Oxide
  2. B.Element
  3. C.Carbon
  4. D.Nitrogen
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Answer: A. Oxide

A binary compound of oxygen with another element is called an oxide.

JAMB 2021Question 6 · Environmental and Industrial Chemistry
The gas which causes global warming is?
  1. A.O
  2. B.CO
  3. C.N
  4. D.He
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Answer: B. CO

Carbon(IV) oxide is a major greenhouse gas responsible for global warming.

JAMB 2021Question 7 · Organic Chemistry
The enzyme that converts glucose to ethyl alcohol is?
  1. A.maltase
  2. B.zymase
  3. C.Diatase
  4. D.Invertase
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Answer: B. zymase

Zymase, an enzyme complex from yeast, converts glucose into ethanol (and ) during fermentation.

JAMB 2021Question 8 · Periodicity and Inorganic Chemistry
What is the chemical name for the compound CuCO?
  1. A.Copper (iii) carbonate
  2. B.Copper (ii) carbonate
  3. C.Copper (i) carbonate
  4. D.Copper
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Answer: B. Copper (ii) carbonate

is copper(II) carbonate, since copper commonly exists as in this compound.

JAMB 2021Question 9 · Physical Chemistry
The scientist who stated that matter can be converted into energy is?
  1. A.Boyle
  2. B.Lavoiser
  3. C.Avogadro
  4. D.Einstein
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Answer: D. Einstein

Einstein's mass-energy equivalence (E=) established that matter can be converted into energy.

JAMB 2021Question 10 · Physical Chemistry
The molar enthalpy change accompanying the removal of an electron from a gas phase atom or ion in its ground state is called?
  1. A.Electron gain enthalpy
  2. B.Ionization enthalpy
  3. C.Enthalpy change
  4. D.Enthalpic gas removal
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Answer: B. Ionization enthalpy

The molar enthalpy change for removing an electron from a gas-phase atom/ion in its ground state is the ionization enthalpy.

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