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  • Which one of the following processes involve chemical reactions? (a) Storing of oxygen gas under pressure in a gas cylinder

Which one of the following processes involve chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder

(b) Liquefaction of air

(c) Keeping petrol in a china dish in the open

(d) Heating copper wire in presence of air at high temperature

Answers (1)

Ans. (d)

Storing of oxygen gas under pressure in a gas cylinder – does not involve chemical reactions

Liquefaction of air - Air is liquefied by the Linde process, in which air is alternately compressed, cooled, and expanded, each expansion results in a considerable reduction in temperature. With the lower temperature the molecules move more slowly and occupy less space, so the air changes phase to become liquid. Hence it does not involve chemical reactions

Keeping petrol in a china dish in the open – does not involve chemical reactions

When copper is heated in the presence of air in a very high temperature, a chemical reaction takes place.

2Cu + O_2 \rightarrow 2CuO

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