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Question

Assertion :1st ionization energy of P is greater than S. Reason: Zeff value of S is greater than P.


Read the above assertion and reason and choose the correct option regarding it.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
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.
The first ionization energy of P:[Ne]3s23p3 is greater than S:[Ne]3s23p4 because P has half-filled electronic configuration and it is difficult to remove an electron from stable species.

Zeff value of S is 2.5 and that of P is 2.1 .

Hence, the correct option is B

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