Which of the following chemical equations represents the balanced reaction in which dichlorine heptaoxide (Cl 2 O 7 ) in the gaseous state combines with an aqueous solution of hydrogen peroxide in an acidic medium to produce chlorite ions (ClO 2 – ) and oxygen gas?

Options

1. A2Cl 2 O 7 (g) + 8H 2 O 2 (aq) + 12H + (aq) → 4ClO 2 – (aq) + 12H 2 O(l) + 7O 2 (g)
2. B2Cl 2 O 7 (g) + 2H 2 O 2 (aq) + 2H + (aq) → 2ClO 2 – (aq) + 2H 2 O(l) + O 2 (g)
3. CCl 2 O 7 (g) + 4H 2 O 2 (aq) + → 2ClO 2 – (aq) + 2H + + 4O 2 (g)
4. D3Cl 2 O 7 (g) + 4H 2 O 2 (aq) + → 6ClO 2 – (aq) + 4H 2 O(l) + 3O 2 (g)