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SO 2 reduces Fe (III) salt to iron (II) salt. 2Fe 3 + + SO 2 , + 2H 2 O→ 2Fe 2+ + SO 4 , 2 ' + 4H +

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The p-Block Elements

Short Answer Type

391. Why does O₃ act as a powerful oxidising agent?

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392. How is O₃ estimated quantitatively?

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393. What happens when sulphur dioxide is passed into aqueous solution of Fe (III) salt?

SO₂ reduces Fe (III) salt to iron (II) salt.
2Fe^{3 +} + SO₂, + 2H₂ O→ 2Fe²⁺ + SO₄,²' + 4H⁺

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394. Comment on the nature of two S-O bonds formed in SO₂ molecule. Are the two S-O bonds in this molecule equal?

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395. How is the presence of SO₂ detected?

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396. Mention three areas in which H₂SO₄ plays an important role.

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397. Write the conditions to maximise the yield of H₂SO₄ by contact process.

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398. Why is Ka₂ < < Ka, for H₂SO₄ in water?

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399. Considering the parameters such as bond dissociation enthalpy, electron gain enthalphy and hydration enthalpy compare the oxidising power of F₂ and Cl₂.

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400. Give two examples to show the anomalous behaviour of fluorine.

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