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The first ionization enthalpy of $\mathrm{ \mathrm{Na}, \mathrm{Mg}}$ and $\mathrm{ Si, }$ respectively, are : $496,737$ and $\mathrm{786 \mathrm{~kJ} \mathrm{~mol}^{-1}.}$ The first ionization enthalpy $\mathrm{\left(\mathrm{kJ}\; \mathrm{mol}^{-1}\right)}$ of $\mathrm{\mathrm{Al}}$ is :
Option: 1
$487$

Option: 2
$768$

Option: 3
$577$

Option: 4
$856$

Answers (1)

best_answer

The order of first ionisation is -

   $\mathrm{Na< Al< Mg< Si}$
$\downarrow$    $\downarrow$ $\downarrow$
$\mathrm{IE_{1}\rightarrow 496}$ $737$ $786$

So, $\mathrm{IE_{1}}$ of $\mathrm{Al}$ should be between 496 and 737 KJ|mol.
among the option only 577 is suitable for above criteria.

Option (3) is correct.

Posted by

Pankaj Sanodiya

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