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 ABoth 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.