Question
Which of the following has highest melting point
✓
Answer
c
${\text{I}}{{\text{E}}_1} \Rightarrow \mathop {{\text{Li}}}\limits_{2{s^1}} \quad \mathop {{\text{Be}}}\limits_{2{s^2}} \quad \mathop {\text{B}}\limits_{2{p^1}} \quad \mathop {\text{C}}\limits_{2{p^2}} $
${\text{I}}{{\text{E}}_1} \Rightarrow \mathop {{\text{Li}}}\limits_{2{s^1}} \quad \mathop {{\text{Be}}}\limits_{2{s^2}} \quad \mathop {\text{B}}\limits_{2{p^1}} \quad \mathop {\text{C}}\limits_{2{p^2}} $
Order $\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{C}$
in gaseous form reducing power $\propto \frac{1}{\mathrm{I} . \mathrm{E}}$
in aq. medium size $\Rightarrow \mathrm{Li}^{+}>\ldots \ldots>\mathrm{Rb}^{+}>\mathrm{Cs}^{+}$
$\therefore$ ionic mobility $\propto \frac{1}{\mathrm{H.R}}$
$\mathrm{EA} \Rightarrow$ as per data
$\mathrm{S}>\mathrm{Se}>\mathrm{Te}>\mathrm{Po}>\mathrm{O}$
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