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JAMB UTME Chemistry 2024 past questions and answers

This 2024 JAMB UTME Chemistry set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2024 set with instant marking.

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Sample JAMB UTME Chemistry 2024 questions

1. In the electrolytic extraction of aluminium, why is cryolite added to purified aluminium oxide?
  1. It oxidises aluminium ions at the cathode
  2. It prevents the anode from being consumed
  3. It lowers the melting point of the electrolyte
  4. It supplies carbon for reducing aluminium oxide

Answer: C. It lowers the melting point of the electrolyte

Cryolite dissolves alumina and lowers the operating temperature, reducing the energy required for electrolysis.

2. In a blast furnace, which substance is mainly responsible for reducing iron(III) oxide to iron?
  1. Carbon monoxide
  2. Calcium oxide
  3. Nitrogen
  4. Silicon dioxide

Answer: A. Carbon monoxide

Carbon monoxide removes oxygen from iron(III) oxide to form iron and carbon dioxide.

3. A steel water pipe is connected to a block of magnesium to reduce rusting; the magnesium protects the pipe because it
  1. forms an impermeable oxide coating on the steel
  2. makes the water alkaline
  3. removes dissolved oxygen from the water
  4. is oxidised preferentially to the iron

Answer: D. is oxidised preferentially to the iron

Magnesium is more reactive than iron, so it acts as a sacrificial anode and corrodes in preference to the steel.

4. Which reagent can oxidise chloride ions in concentrated hydrochloric acid to produce chlorine gas?
  1. Sodium hydroxide
  2. Acidified potassium permanganate
  3. Calcium carbonate
  4. Aqueous ammonia

Answer: B. Acidified potassium permanganate

Acidified potassium permanganate is a strong oxidising agent that converts chloride ions to chlorine.

5. What is the usual volume ratio of nitrogen to hydrogen in the feed mixture for the Haber process?
  1. 1:1
  2. 1:3
  3. 3:1
  4. 2:3

Answer: B. 1:3

The balanced equation N2 + 3H2 ⇌ 2NH3 requires one volume of nitrogen for every three volumes of hydrogen.

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