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(Given : Density of solution $=1.25 \mathrm{~g} \mathrm{~mL}^{-1}$, Molar mass in $\left.\mathrm{g} \mathrm{mol}^{-1}: \mathrm{Na}-23, \mathrm{Cl}-35.5\right)$
(At. No. $Ti = 22, V = 23, Cr = 24, Mn = 25$)
${\Lambda ^o}_{NaCl}\, = \,{\lambda ^o}_{N{a^ + }} + {\lambda ^o}_{C{l^{\, - }}}$
Reason : This is according to Kohlrausch law of independent migration of ions
| List $- I$ Electronic configuration of elements |
List $- II$ $\Delta_{ i }$ in $kJ\, mol-1$ |
| $(a)$ $1 s ^{2} 2 s ^{2}$ | $(i)$ $801$ |
| $(b)$ $1 s ^{2} 2 s ^{2} 2 p ^{4}$ | $(ii)$ $899$ |
| $(c)$ $1 s^{2} 2 s^{2} 2 p^{3}$ | $(iii)$ $1314$ |
| $(d)$ $1 s ^{2} 2 s ^{2} 2 p ^{1}$ | $(iv)$ $1402$ |
Choose the most appropriate answer from the options given below