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JAMB Chemistry Past Questions 2022

10 questions from the JAMB 2022 Chemistry paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2022Question 1 · Acids, Bases, and Salts
In the preparation of salts, the method employed will depend on the?
  1. A.composition
  2. B.dissociating ability
  3. C.stability to heat
  4. D.precipitating ability
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Answer: D. precipitating ability

The method chosen for preparing a salt depends largely on whether the salt is soluble or precipitates out (its 'precipitating ability'/solubility).

JAMB 2022Question 2 · Atomic Structure and Chemical Bonding
How many neutrons are present in atom with mass number and atomic number 37 and 17 respectively?
  1. A.18
  2. B.20
  3. C.37
  4. D.17
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Answer: B. 20

Neutrons = mass number - atomic number = 37-17 = 20.

JAMB 2022Question 3 · Chemistry of Metals
Using the metal activity series, the metal that can liberate hydrogen gas from steam is?
  1. A.iron
  2. B.copper
  3. C.tin
  4. D.lead
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Answer: A. iron

Iron reacts with steam (though not with cold water) to liberate hydrogen gas: 3Fe + (steam) → + .

JAMB 2022Question 4 · Chemistry of Non-metals and Gases
The sulphide that is commonly used in coating electric fluorescent tubes is?
  1. A.iron(ii)Sulphide
  2. B.tin(ii)sulphide
  3. C.Zinc Sulphide
  4. D.lead(iv) Sulphide
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Answer: C. Zinc Sulphide

Zinc sulphide is commonly used as a phosphor coating in fluorescent tubes.

JAMB 2022Question 5 · Electrochemistry and Redox Reactions
Zn + 2HCL → ZnCl + H What happens to zinc in the above reaction?
  1. A.oxidized
  2. B.a reactant
  3. C.reduced
  4. D.a metal
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Answer: A. oxidized

Zinc is oxidized (Zn(0) to ) as it displaces hydrogen from HCl.

JAMB 2022Question 6 · Environmental and Industrial Chemistry
Addition of charcoal to the filter bed of sand during water treatment for township supply is to?
  1. A.prevent goiter
  2. B.prevent tooth decay
  3. C.remove odour
  4. D.kill germs
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Answer: C. remove odour

Charcoal added to the sand filter bed in water treatment removes odours (and tastes) by adsorption.

JAMB 2022Question 7 · Organic Chemistry
An organic compound which liberate carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?
  1. A.CHOH
  2. B.CH
  3. C.CH
  4. D.CHCOOH
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Answer: D. CHCOOH

Ethanoic acid , being acidic, liberates from a trioxocarbonate(IV) solution.

JAMB 2022Question 8 · Organic Chemistry
Crude petroleum is converted to useful products by the process of?
  1. A.fractional crystallization
  2. B.fractional distillation
  3. C.filtration
  4. D.chromatography
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Answer: B. fractional distillation

Crude petroleum is separated into useful fractions by fractional distillation.

JAMB 2022Question 9 · Physical Chemistry
Addition of sodium chloride to water to form a solution would lead to?
  1. A.increase in freezing point and increase the boiling point
  2. B.increase in freezing point and decrease the boiling point
  3. C.decrease in freezing point and decrease the boiling point
  4. D.decrease in freezing point and increase the boiling point
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Answer: D. decrease in freezing point and increase the boiling point

Dissolving NaCl in water lowers the freezing point (freezing point depression) and raises the boiling point (boiling point elevation) — both colligative property effects.

JAMB 2022Question 10 · Physical Chemistry
Which of the following best represent solid gas mixture?
  1. A.milk
  2. B.kerosene
  3. C.soil
  4. D.smoke
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Answer: D. smoke

Smoke is a mixture of solid particulates suspended in a gas.

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