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When ozone reacts with an excess of potassium iodide. Solution buffered with a borate buffer (pH = 9.2). 2I - (aq) +H 2 O(l) +O 3 (g) → 2OH - (aq) +I 2 (s) +H 2 O(g) Iodine is liberated which can be titrated against a standard solution of sodium thiosulphate. This is a quantitative method of estimating the O 3 gas.

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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?

When ozone reacts with an excess of potassium iodide. Solution buffered with a borate buffer (pH = 9.2).

2I^-(aq) +H₂O(l) +O₃(g) → 2OH^-(aq) +I₂(s) +H₂O(g)

Iodine is liberated which can be titrated against a standard solution of sodium thiosulphate. This is a quantitative method of estimating the O₃ gas.

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

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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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