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JAMB Chemistry 1986 Question 35

Question 35

Redox Reactions

What are the values of x, y and z respectively in the equation: xCu + yHNO3 → xCu(NO3)2 + 4H2O + zNO?

  1. A.4:1:2
  2. B.3:8:2
  3. C.2:8:3
  4. D.8:3:2
Show the answer and explanation

Answer: B (3:8:2)

Explanation

The balanced equation is 3Cu + 8HNO3 → 3Cu(NO3)2 + 4H2O + 2NO; check: 8 H on each side and 8 N on each side. So x = 3, y = 8, z = 2.