Question

Match List -I with List - II

List - I Electronic configuration of elements		List-II ${\Delta }_i$ in $kJmo{l}^{-1}$
(a)	$1s^{2}2s^2$	(i)	801
(b)	$1s^{2}2s^{2}2p^4$	(ii)	899
(c)	$1s^{2}2s^{2}2p^3$	(iii)	1314
(d)	$1s^{2}2s^{2}2p^1$	(iv)	1402

Choose the most appropriate answer from the options given below -

• A. $(a)\to (ii),(b)\to (iii),(c)\to (iv),(d)\to (i)$
• B. $(a)\to (i),(b)\to (iv),(c)\to (iii),(d)\to (ii)$
• C. $(a)\to (i),(b)\to (iii),(c)\to (iv),(d)\to (ii)$
• D. $(a)\to (iv),(b)\to (i),(c)\to (ii),(d)\to (iii)$

Answer 1

Answer: (A)

(a) $1s^{2}2s^2\to Be$

(b) $1s^{2}2s^{2}2p^4\to O$

(c) $1s^{2}2s^{2}2p^3\to N$

(d) $1s^{2}2s^{2}2p^1\to B$

The ionization enthalpy order is

$B<Be<O<N$

$Be$ has more $IE$ compared to $B$ due to extra stability & $N$ has more $IE$ compared to oxygen due to extra stability

Hence, $N\to 1402kJ/mol$

$O\to 1314kJ/mol$

$B\to 801kJ/mol$

$Be\to 899kJ/mol$