- ✓$N$
- B$P$
- C$As$
- D$Bi$
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$(A)$ Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.
$(B)$ The common oxidation states of these elements are $-3,+3$ and +5 .
$(C)$ Nitrogen has unique ability to form $\mathrm{p} \pi-\mathrm{p} \pi$ multiple bonds.
$(D)$ The stability of +$5$ oxidation states increases down the group.
$(E)$ Nitrogen shows a maximum covalency of $6$.
Choose the correct answer from the options given below.

$C{o^{3 + }}{e^ - } \longrightarrow C{o^{2 + }};\,{E^o} = 1.81\,V$
$P{b^4} + 2{e^ - } \longrightarrow P{b^{2 + }};\,{E^o} = + 1.67\,V$
$C{e^{4 + }} + {e^ - } \longrightarrow C{e^{3 + }};\,{E^o} = + 1.61\,V$
$B{i^{3 + }} + 3{e^ - } \longrightarrow Bi;\,{E^o} = + 0.20\,V$
Oxidizing power of the species will increase in the order
$Pt \left| H _{2}( g )\right| H ^{+}( aq ) \| Cu ^{2+}(0.01 M ) \mid Cu ( s )$
is $0.576 \,V$ at $298\, K$. The $pH$ of the solution is $......\,.$ (Nearest integer)