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Metals Reaction with Oxygen (Burnt in Air)

Assertion [A]...

Question

Assertion [A]: Copper becomes dull in moist air.
Reason [R]: Copper is coated by a thin film of its basic copper carbonate formed in moist air.

A

Both A and R are true and R is the correct explanation of A.

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B

Both A and R are true but R is not the correct explanation of A.

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C

A is true but R is false.

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D

A is false but R is true.

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Solution

The correct option is A Both A and R are true and R is the correct explanation of A.
Copper reacts with carbon dioxide to form copper carbonate. This forms a layer on top which makes it look dull.

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Metals Reaction with Oxygen (Burnt in Air)

Standard VIII Chemistry

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