The first ionisation enthalpy of Na, Mg and Si are 496,737,776 ~kJ / mol respectively. What will be the first ionisation enthalpy potential of Al in kJ / mol ?

Correct answer: B. >496 and < 737 ~kJ The ionisation enthalpy of Al is lower than that of Mg as 3 p^1 electron of Al is easier to remove than to remove an electron from 3s-orbital of Mg fully-filled.

AIIMS 2013

Exam: AIIMS
Year: 2013
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

AIIMS 2013 · Chemistry · Classification of Elements and Periodicity in Properties

The first ionisation enthalpy of Na, Mg and Si are 496,737,776 ~kJ...

The first ionisation enthalpy of

\mathrm{Na}, \mathrm{Mg}

and

\mathrm{Si}

are

496,737,776 \mathrm{~kJ} / \mathrm{mol}

respectively. What will be the first ionisation enthalpy potential of

\mathrm{Al}

\mathrm{kJ} / \mathrm{mol}

Options

A $>766 \mathrm{~kJ} / \mathrm{mol}$
B $>496$ and $< 737 \mathrm{~kJ}$
C $>737$ and $< 766 \mathrm{~kJ} / \mathrm{mol}$
D $>496 \mathrm{~kJ} / \mathrm{mol}$

Correct answer

B. $>496$ and $< 737 \mathrm{~kJ}$

Step-by-step solution

The ionisation enthalpy of

\mathrm{Al}

is lower than that of

\mathrm{Mg}

3 p^1

electron of

\mathrm{Al}

is easier to remove than to remove an electron from 3s-orbital of Mg fully-filled.

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