Assertion :Alkali metals are paramagnetic but their salts are diamagnetic. Reason: Alkali metals are elements having 1 valence electron is s-subshell. As it has one unpaired electron, the salts of alkali metals are formed by bonding of their valence electrons as they do not have unpaired electrons.

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.
All the alkali metals are paramagnetic because of the presence of one valence electron in the valence shell. The alkali metal cations, i.e., $L i^{+}, N a^{+}, K^{+}, R b^{+}$ and $C s^{+}$ all are diamagnetic because of absence of unpaired electrons. Therefore, their salts do not show paramagnetic property.

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