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Assertion: The first ionisation enthalpy...

Assertion: The first ionisation enthalpy of aluminium is lower than that of magnesium.
Reason : Ionic radius of aluminium is smaller than that of magnesium.

Text Solution

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The correct Answer is:
B
Correct explanation . In A1 , a less strongly held 3p- electron is to be removed while in Mg a more strongly held 3s- electron is to be removed.
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