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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The first ionization enthalpy of

\mathrm{Na}, \mathrm{Mg}

and

\mathrm{Si}

, respectively, are : 496,737 and

786 \mathrm{~kJ} \mathrm{~mol}^{-1}

. The first ionization enthalpy

\left(\mathrm{kJ} \mathrm{mol}^{-1}\right)

\mathrm{Al}

is:

View answer and explanation

Correct option: C

577

The correct answer is C (577) because the ionization enthalpy of Al is expected to be between that of Na and Mg, and also less than that of Si due to electronic configuration.

JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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