Ncert Exercises & Solutions

Which of the following statements are correct?

a.	S — S bond is present in H₂S₂O₆
b.	In peroxosulphuric acid (H₂SO₅) sulphur is in +6 oxidation state
c.	Iron powder along with Al₂O₃ and K₂O is used as a catalyst in the preparation of NH₃ by Haber's process
d.	Change in enthalpy is positive for the preparation of SO₃ by catalytic oxidation of SO₂

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: Maximum oxidation state of sulphur is +6

The structure of H₂S₂O₆ is as shown below

It contains one S—S bond. Hence, first is the correct statement.

(b) In peroxosulphuric acid (H₂SO₅) sulphur is in + 6 oxidation state.

The structure of H₂SO₅ is

let the oxidation state of S = x:

2 \times (+ 1) + x + 3 \times (- 2) + 2 \times (- 1) = 0

x - 6 = 0

x = 6

Hence, the second statement is also correct

(c)

During the preparation of ammonia, iron oxide with a small amount of K₂O and Al₂O₃ is used as a catalyst to increase the rate of attainment of equilibrium. Hence the third statement is incorrect.

(d)
Change in enthalpy is negative for the preparation of SO₃ by catalytic oxidation of SO₂. Hence, fourth statement is wrong.

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