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Balance the following equations in basic medium by ion - electron method and oxidation number methods Cl 2 O 7 g + H 2 O 2 aq ⟶ ClO 2 - aq + O 2 g stoichiometric coefficients for Cl 2 O 7 (g), H 2 O 2 (aq), ClO 2 - and O 2 (g) may be

Options

  1. A1, 4, 2, 4
  2. B1, 3, 2, 3
  3. C1, 5, 2, 4
  4. D1, 2, 2, 2

Correct answer

A. 1, 4, 2, 4

Step-by-step solution

Cl + 7 2 O 7 + 8 e ⟶ 2 Cl + 3 O 2 - 1 RHR H 2 O 2 + 2 OH aq - 1 ⟶ O + 2 H 2 O + 2 e - OHR × 4 ------------------------------------------------------------------------ Cl 2 O 7 + 4 H 2 O 2 + 8 OH aq - ⟶ 2 ClO 2 aq - 1 + 4 O 2 + 8 H 2 O To balance unbalanced oxygen atoms, add 3H 2 O molecules on LHS and 6 OH - ions on RHS Cl 2 O 7 + 4 H 2 O 2 + 8 OH - + 3 H 2 O ⟶ 2 ClO 2 - 1 + 4 O 2 + 8 H 2 O + 6 OH aq - 1 Cl 2 O 7 + 4 H 2 O 2 + 2 OH aq - 1 ⟶ 2 ClO 2 - 1 + 4 O 2 + 5 H 2 O

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