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

AcademicChemistryNCERTClass 10

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

Explanation: In first three options given above, a chemical reaction does not take place as no new product is formed. When copper is heated in the presence of air at high-temperature copper undergoes oxidation reaction to give out copper oxide.

raja
Updated on 10-Oct-2022 13:27:09

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