Assertion : $C l^{-}$ is the conjugate base of $H C l$ . Reason: A conjugate base is formed when an acid gains a proton.

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 C Assertion is correct but Reason is incorrect.
Chloride ion ( $C l^{-}$ ) is the conjugate base of $H C l$ .
A conjugate base is formed when an acid loses a proton.
$H C l \to H^{+} + C l^{-}$
Thus, acid and conjugate base differ by a proton.
Assertion is correct but Reason is incorrect.

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