. 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
 

Best Answer

Answer: d) Heating copper wire in the 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 the presence of air at high-temperature copper undergoes oxidation reaction to give out copper oxide.

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