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JAMB Chemistry 1994 Question 25

Question 25

Redox Reactions

H−(s) + H2O(l) → H2(g) + OH−(aq). From the equation above, it can be inferred that the

  1. A.reaction is a double decomposition
  2. B.hydride ion is a reducing agent
  3. C.hydride ion is an oxidizing agent
  4. D.reaction is neutralization
Show the answer and explanation

Answer: B (hydride ion is a reducing agent)

Explanation

Hydrogen in H− goes from −1 to 0 in H2, so the hydride ion loses electrons (is oxidized). A substance that is oxidized acts as the reducing agent.