$(b)\,\mathop C\limits_{2{p^2}} \to \mathop {{C^ + }}\limits_{2{p^1}} \to C_{2{s^2}}^{2 + }$ $\mathop N\limits_{2{p^3}} \to \mathop {{N^ + }}\limits_{2{p^2}} \to \mathop {{N^{2 + }}}\limits_{2{p^1}} $ $\mathop O\limits_{2{p^4}} \to \mathop {{O^ + }}\limits_{2{p^3}} \to \mathop {{O^{2 + }}}\limits_{2{p^2}} $
$(c)\,\mathop F\limits_{2{p^5}} \xrightarrow{{I.E{._1}}}\mathop {{F^ + }}\limits_{2{p^4}} \xrightarrow{{I.E{._2}}}\mathop {{F^{2 + }}}\limits_{2{p^3}} \xrightarrow{{I.E{._3}}}{F^{3 + }}$ $\mathop O\limits_{2{p^4}} \xrightarrow{{I.E{._1}}}\mathop {{O^ + }}\limits_{2{p^3}} \xrightarrow{{I.E{._2}}}\mathop {{O^{2 + }}}\limits_{2{p^2}} \xrightarrow{{I.E{._3}}}{O^{3 + }}$
$(d)$ In respective period, noble gases have highest $I.E.$
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$\overset{\left( II \right)}{\mathop{\left[ Cu{{\left( N{{H}_{3}} \right)}_{4}} \right]}}\,$ $\overset{\left( II \right)}{\mathop{\left[ PtC{{l}_{4}} \right]}}\,$
In the above first order reaction the concentration of $\mathrm{PCl}_{5}$ reduces from initial concentration $50\, mol\,\mathrm{L}^{-1}$ to $10\, \mathrm{~mol} \,\mathrm{~L}^{-1}$ in $120\, minutes$ at $300\, \mathrm{~K}$. The rate constant for the reaction at $300\, \mathrm{~K}$ is $\mathrm{X}$ $\times 10^{-2} \mathrm{~min}^{-1}$. The value of $x$ is $......$
$[$ Given $\log 5=0.6989]$