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Chemistry

Write the balanced chemical equation for –

(i) Action of cold and dilute nitric acid on copper.

(ii) Action of conc. nitric acid on sulphur.

(iii) Laboratory preparation of nitric acid.

Nitric Acid

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Answer

(i) 3Cu + 8HNO3 [dil.] ⟶ 3Cu(NO3)2 + 4H2O + 2NO(g)

(ii) S + 6HNO3 [conc.] ⟶ H2SO4 + 2H2O + 6NO2

(iii) KNO3 [conc.] + H2SO4 [conc.] <200°C\xrightarrow{\lt 200 \degree\text{C}} KHSO4 + HNO3

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