Assertion : $C l O_{4}^{-}$ is a very weak base. Reason: In $C l O_{4}^{-}$ ion, chlorine is $s p^{3}$ hybridized.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$C l O_{4}^{-}$ has $s p^{3}$ hybridized $C l$ atom.
$H$ in $H C l O_{4}$ is attached to the oxygen atom and it is a strong acid.
$C l O_{4}^{-}$ is the conjugate base of $H C l O_{4}$ and the conjugate base of a strong acid is a weak base.
The two sentences are different from each other but both are correct.

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