Explain why [4 MARKS]
(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
(b) Nitric acid, when kept in a reagent bottle for a long time, turns yellow.

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Solution

Each Part: 2 Marks

(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate because the nitric acid produced reacts with almost all the materials including cork and rubber except glass.

(b) It turns yellow because $H N O_{3}$ decomposes by the action of light to give brown coloured $N O_{2}$ which imparts a yellow colour to $H N O_{3}$ .
$4 H N O_{3} S u n l i g h t \to 4 N O_{2} + 2 H_{2} O + O_{2}$

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Explain why [4 MARKS] (a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate. (b) Nitric acid, when kept in a reagent bottle for a long time, turns yellow.

Explain why [4 MARKS]
(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
(b) Nitric acid, when kept in a reagent bottle for a long time, turns yellow.