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.

Assertion and reason both are correct statements and reason is correct explanation for assertion.

Assertion and reason both are correct statements but reason is not correct explanation for assertion.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but reason is correct statement.

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

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

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

If assertion is true but reason is false.

If assertion is false but reason is true.

Atomic size of `Al gt` Atomic size of Mg

Atomic size of `Al lt ` Atomic size of Mg

Al has one electron in p- orbital

None of these

Aluminium

carbon

potassium

calcium