What happens when copper comes in contact with dilute HCl in the absence of air?

Copper dissolves in dil. HCl.

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No action on copper will take place.

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Copper chloride will be formed.

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Copper sulphate will be formed.

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Solution

The correct option is B
No action on copper will take place.

Dilute acids such as HCl and $H_{2} S O_{4}$ have no action on copper in the absence of air. Copper dissolves in these acids in the presence of air. The following reactions are as follows:-

$2 C u + 4 H C l + O_{2} (a i r) \to 2 C u C l_{2} + 2 H_{2} O$

$2 C u + 2 H_{2} S O_{4} + O_{2} (a i r) \to 2 C u S O_{4} + 2 H_{2} O$

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