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JEE Main levelOne or more correct optionsDifficulty 2 of 3pt131

Select the correct statements about first ionisation enthalpy (typical NCERT values).

A $Mg$ has a higher value than $Al$
B $O$ has a higher value than $N$
C $B$ has a higher value than $Be$
D $P$ has a higher value than $S$

Answer: A, D

Mg (738) > Al (577) as Al loses a higher-energy

3 p

electron; P (1012) > S (1000) due to the half-filled

3 p^{3}

of P. B (801) is below Be (899), and O (1314) is below N (1402). So only the first two are correct.

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