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JAMB Chemistry 2010 Question 22

Question 22

Redox Reactions

6AgNO3(aq) + PH3(g) + 3H2O(l) → 6Ag(s) + H3PO3(aq) + 6HNO3(aq)
In the reaction above, the reducing agent is

  1. A.HNO3(aq)
  2. B.H2O(l)
  3. C.PH3(g)
  4. D.AgNO3(aq)
Show the answer and explanation

Answer: C (PH3(g))

Explanation

P goes from −3 in PH3 to +3 in H3PO3 (oxidised) while Ag+ is reduced to Ag, so PH3 is the reducing agent.