Match List-I with List-II.

List-I
(Electronic configuration of elements ) List-II
(I.E. in kJ/mol)

(a) $1 s^{2} 2 s^{2}$ (i) 801

(b) $1 s^{2} 2 s^{2} 2 p^{4}$ (ii) 899

(c) $1 s^{2} 2 s^{2} 2 p^{3}$ (iii) 1314

(d) $1 s^{2} 2 s^{2} 2 p^{1}$ (iv) 1402

(a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)

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(a) – (iv), (b) – (i), (c) – (ii), (d) – (iii)

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(a) – (i), (b) – (iv), (c) – (iii), (d) – (ii)

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(a) – (i), (b) – (iii), (c) – (iv), (d) – (ii)

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Solution

The correct option is A (a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)
$1 s^{2} 2 s^{2} \to B e 1 s^{2} 2 s^{2} 2 p^{4} \to O 1 s^{2} 2 s^{2} 2 p^{3} \to N 1 s^{2} 2 s^{2} 2 p^{1} \to B$

The ionization enthalpy order is $B < B e < O < N .$ $B e$ has more I.E. compared to $B$ due to extra stabe fully filled $2 s$ orbital & $N$ has more I.E. compared to $O$ due to extra stable half filled $2 p$ orbital.

Hence,
$N \to 1402 k J / m o l O \to 1314 k J / m o l B \to 801 k J / m o l B e \to 899 k J / m o l$

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Similar questions

	List-I		List-II
	Electonic configuration of elements		$Δ_{1} H (i n k J m o l^{- 1})$
(a)	$1 s^{2} 2 s^{2}$	(i)	$801$
(b)	$1 s^{2} 2 s^{2} 2 p^{4}$	(ii)	$899$
(c)	$1 s^{2} 2 s^{2} 2 p^{3}$	(iii)	$1314$
(d)	$1 s^{2} 2 s^{2} 2 p^{1}$	(iv)	$1402$

\begin{matrix} List-I & List - II P. & 1 s^{2} & 1. & Element shows highest negative oxidation state Q. & 1 s^{2} 2 s^{2} 2 p^{5} & 2. & Element shows highest first ionisation enthalpy R. & 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} & 3. & Element shows highest electronegativity on Pauling scale S. & 1 s^{2} 2 s^{2} 2 p^{2} & 4. & Element shows maximum electron gain enthalpy (most exothermic) \end{matrix}

\begin{matrix} L i s t - I & L i s t - I I (I) 1 s^{2} & (P) Element shows highest negative oxidation state. (I I) 1 s^{2} 2 s^{2} 2 p^{5} & (Q) Element shows highest first ionisation enthalpy. (I I I) 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} & (R) Element shows highest electronegativity on Pauling scale. (I V) 1 s^{2} 2 s^{2} 2 p^{2} & (S) Element shows maximum electron gain enthalpy (most exothermic). (T) Configuration belongs to C l (U) configuration belongs to C \end{matrix}

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List-I (Electronic configuration of elements )	List-II (I.E. in kJ/mol)
(a) $1 s^{2} 2 s^{2}$	(i) 801
(b) $1 s^{2} 2 s^{2} 2 p^{4}$	(ii) 899
(c) $1 s^{2} 2 s^{2} 2 p^{3}$	(iii) 1314
(d) $1 s^{2} 2 s^{2} 2 p^{1}$	(iv) 1402