Assertion :A greenish layer appears on copper vessels, if left uncleaned. Reason: It is due to the formation of a layer of basic copper carbonate.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
In water dissolved oxygen and carbon dioxide gases are present. Due to corrosion, a green-colored layer is formed and the reaction involved can be represented as:

$3 C u + C O_{2} + H_{2} O + O_{2} ⟶ C u C O_{3} . C u (O H)_{2}$
The product of above reaction has greenish layer and it appears on copper vessel.

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