Question

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 temperatureNCERT Class XScience - Exemplar ProblemsChapter_Chemical Reactions And Equations

Answer 1

the correct answer is-
d)heating copper wire in presence of air at high temperature

Answer 2

Answer:

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

Explanation:

In first three options given here there is no involvement of chemical reaction. When copper is heated in presence of air at high temperature copper undergoes oxidation reaction to give out copper oxide.

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