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In which of the following reactions H 2 O 2 acts as a reducing agent ? (a)   H 2 O 2 + 2 H + + 2 e - → 2 H 2 O (b)   H 2 O 2 - 2 e - → O 2 + 2 H + (c)   H 2 O 2 + 2 e - → 2 OH - (d)   H 2 O 2 + 2 OH - - 2 e - → O 2 + 2 H 2 O

Options

  1. A(a) , (b)
  2. B(c) , (d)
  3. C(a) , (c)
  4. D(b) , (d)

Correct answer

D. (b) , (d)

Step-by-step solution

Reducing agent undergoes oxidation and in oxidation half reaction there will be loss of electrons. (b) H 2 O 2 → O 2 + 2 H + + 2 e - (loss) (d) H 2 O 2 + OH - → 2 H 2 O + O 2 + 2 e - (loss)

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