Question

Arrange the acids 

(i) H₂SO₃

(ii) H₃PO₃ and 

(iii) HClO₃ in the decreasing order of acidity. 

(a) (i) > (iii) > (ii) 

(b) (i) > (ii) > (iii) 

(c) (ii) > (iii) > (I) 

(d) (iii) > (i)> (ii)

Answer 1

(d) (iii) > (i)> (ii)

Acidity is directly proportional to oxidation number. As the oxidation number of S, P and Cl in H₂SO₃ , H₃PO₃ and HCIO₃ is +4, +3, +5 respectively. So decreasing order of acidity will be (iii) > (I) > (ii)