Assertion :Size of an anion is larger than its parent atom. Reason: $Z_{e f f}$ of anion is greater than of its parent atom.

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
Size of an anion is larger than its parent atom.

The effective nuclear charge, $Z_{e f f}$ of the anion is smaller than that of its parent atom. This is because when an anion is formed from a neutral atom, the number of protons remains same but the number of electrons increases by 1. Hence, the same nuclear charge is acting on more electrons. The effective nuclear charge per electron is less.
Hence, the Assertion is correct but Reason is incorrect

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Choose the correct option.

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Assertion :Size of an anion is larger than its parent atom. Reason: Zeff of anion is greater than of its parent atom.

Assertion :Size of an anion is larger than its parent atom. Reason: $Z_{e f f}$ of anion is greater than of its parent atom.