2H2O2 → 2H2O + O2 (a) For (i) What is the oxidation number of Oxygen in (2)?

Question

2H₂O₂ → 2H₂O + O₂ 

(1)          (2)          (3)

(a) For (i) What is the oxidation number of Oxygen in (2)? 

(ii) What type of Redox reaction is it? 

(b) Balance the Redox reaction using oxidation number method. 

SO₂ + H₂S → S + H₂O

Answer 1

(a) (i) -2 

(ii) Disproportionation or Disproportionate reaction.

(b) 

Multiply oxidation equation by 2 and reduction equation by 1. 

SO₂ → S 

2H₂S → 2S 

Add both the equations 

SO₂ + 2H₂S → 3S 

Balancing the atoms of hydrogen and oxygen by introducing suitable number of H₂O molecules to the product.