Ncert Exercises & Solutions

A factory was started near a village. Suddenly villagers started feeling the presence of irritating vapours in the village and cases of headache, chest pain, cough, dryness of throat and breating problems increased. Villagers blamed the emissions from the chimney of the factory for such problems. Explain what could have happened. Give chemical reactions for the support of your explanation.

The symptoms observed in the village indicate that nitrogen oxide and sulphur oxide are released from the chimney of the factory. These are produced by the burning of fossil fuels such as gasoline, coal, natural gas, etc.

In an automobile enging, at high temperature when fossil fuel is burnt, dinitrogen and dioxygen combine to yield NO is i.e., nitric oxide.

N_{2} + O_{2} \overset{1200 - 1500 ° C}{\to} 2 NO

2 NO + O_{2} \overset{1100 ° C}{\to} 2 {NO}_{2}

SO₂ is produced by burning of sulphur containing fossil fuel or by roasting of sulphide ores such as iron pyrites, copper pyrites, etc.

{Cu}_{2} S + O_{2} \to 2 Cu + {SO}_{2}

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