Question

Which of the following reactions depict the oxidising
behaviour of H₂SO₄ :
(a) 2PCl₅ + H₂SO₄ → 2POCl₃ + 2HCl + SO₂Cl₂
(b) 2NaOH + H₂SO₄ → Na₂SO₄ + H₂O
(c) NaCl + H₂SO₄ → NaHSO₄ + HCl
(d) 2HI + H₂SO₄ → I₂ + SO₂ + 2H₂O

Answer 1

Answer:

d- 2 HI + H2SO4-----I2+ SO2+H2O

Answer 2

The reactions which depicts the oxidising behaviour of H₂SO₄ is :

(a) 2PCl₅ + H₂SO₄ → 2POCl₃ + 2HCl + SO₂Cl₂

( +5,-1 ) ( +1,+6,-2 ) ( +5,-2,-1 ) ( +1,-1 ) ( +6,-2,-1 )

• No change in oxidation state of any element

(b) 2NaOH + H₂SO₄ → Na₂SO₄ + H₂O

( +1,-2,+1 ) ( +1,+6,-2 ) ( +1,+6,-2 )

( +1,-2 )

• No change in oxidation state

(c) NaCl + H₂SO₄ → NaHSO₄ + HCl

( +1,-1 ) ( +1,+6,-2 ) ( +1,+1,+6,-2 ) ( +1,-1 )

• No change in oxidation state

(d) 2HI + H₂SO₄ → I₂ + SO₂ + 2H₂O

( +1,-1 ) ( +1,+6,-2 ) ( +0 ) ( +4,-2 )

( +1,-2 )

• Here Iodine gets oxidized from -1 to 0