Correct answer: (a) 2, 5, 16

Explanation:

XMnO₄^- + YC₂O₄^2- + ZH⁺ ⇌ XMn²⁺ + 2YCO₂ + Z/2 H₂O

First half reaction MnO₄^- → Mn⁺².......(i)

On balancing

MnO₄^- + 8H⁺ + 5e^- → Mn⁺² + 4H₂O   ......(ii)

Second half reaction

C₂O₄^2- → 2CO₂ ........ (iii)

On balancing

C₂O₄^2- → 2CO₂ + 2e^- .......(iv)

On multiplying eqn. (ii) by 5 and (iv) by 2 and then adding we get

2MnO₄^- + 5C₂O₄^2- + 16H⁺ ⇌ 2Mn²⁺ + 10CO₂ + 8H₂O