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Chemistry

Identify the gas evolved when:

(i) Sulphur is treated with concentrated nitric acid.

(ii) A few crystals of KNO3 are heated in a hard glass test tube.

Nitric Acid

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Answer

(i) Nitrogen dioxide gas

S + 6HNO3 ⟶ H2SO4 + 2H2O + 6NO2

(ii) Oxygen gas

2KNO3Δ2KNO2+O22\text{KNO}3 \xrightarrow{\Delta} 2\text{KNO}2 + \text{O}_2

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