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Question

Which one of the following processes involve chemical reactions?


A
Storing of oxygen gas under pressure in a gas cylinder
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B
Liquification of air
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C
Keeping petrol in a china dish in the open
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D
Heating copper wire in presence of air at high temperature
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Solution

The correct option is D Heating copper wire in presence of air at high temperature
When copper is heated in presence of air very slowly at high temperature, a layer of brown black copper oxide is formed which protect the copper from extensive corrosion.

Chemistry

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