| Compound | Geometry |
| (A) $BF _3$ | Trigonal planer |
| (B) $PCl _5$ | Trigonal bipyramidal |
| (C) $SF _6$ | Square planer |
| (D) $BeCl _2$ | Linear |
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(The freezing point depression constant for water $=2\; \mathrm{K}\; \mathrm{kg} \;\mathrm{mol}^{-1}$ )
Statement $I$ : The metallic radius of $\mathrm{Na}$ is $1.86 \mathrm{~A}^{\circ}$ and the ionic radius of $\mathrm{Na}^{+}$is lesser than $1.86 \mathrm{~A}^{\circ}$.
Statement $II$ : Ions are always smaller in size than the corresponding elements.
In the light of the above statements, choose the correct answer from the options given below :
$Mn^{2+} + 2e^- \rightarrow Mn,\, $$E^o = - 1.18\, V$
$Mn^{2+} \rightarrow Mn^{3+} + e^-,$ $ E^o = - 1.51 \,V$
The $E^o$ for the reaction $3Mn^{2+} \rightarrow Mn^o + 2Mn^{3+},$
and possibility of the forward reaction are respectively