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JAMB UTME Chemistry 2009 past questions and answers

This 2009 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 2009 set with instant marking.

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Sample JAMB UTME Chemistry 2009 questions

1. What salt is formed when sulfuric acid is completely neutralized by sodium hydroxide?
  1. Sodium sulfate
  2. Sodium sulfite
  3. Sodium hydrogensulfate
  4. Sodium thiosulfate

Answer: A. Sodium sulfate

Complete neutralization follows H2SO4 + 2NaOH -> Na2SO4 + 2H2O, producing sodium sulfate.

2. What is the pH of a solution whose hydrogen ion concentration is 0.010 mol dm^-3?
  1. 1
  2. 2
  3. 10
  4. 12

Answer: B. 2

Since pH = -log10[H+], a concentration of 10^-2 mol dm^-3 gives pH 2.

3. Which gas is released when dilute hydrochloric acid reacts with calcium carbonate?
  1. Hydrogen
  2. Oxygen
  3. Carbon dioxide
  4. Chlorine

Answer: C. Carbon dioxide

An acid reacting with a carbonate forms a salt, water and carbon dioxide.

4. What is the oxidation number of sulfur in the sulfate ion, SO4^2-?
  1. +2
  2. +4
  3. +8
  4. +6

Answer: D. +6

Four oxygen atoms contribute -8 overall, so sulfur must be +6 for the ion's total charge to be -2.

5. In the reaction Zn + Cu2+ -> Zn2+ + Cu, which substance acts as the reducing agent?
  1. Zn
  2. Cu2+
  3. Zn2+
  4. Cu

Answer: A. Zn

Zinc loses electrons to reduce Cu2+ to copper, so zinc is the reducing agent.

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