Assertion : Ionisation potential across the period is $N a < A l < M g < S i$
Reason : Ionisation potential decreases with decrease in atomic size

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If both assertion and reason are true and the reason is the correct explanation of the assertion

If both assertion and reason are true but reason is not the correct explanation of the assertion

If assertion is true but reason is false

If the assertion and reason both are false

answer is C.

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Detailed Solution

Assertion is true but reason is false. Ionisation potential decreases with increase in atomic size and also for a given shell. I.E. is in given order

$s > p > d > f$

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