MCQ
For which of the following ionic species radius would be maximum ?
- ✓$C ^{4-}$
- B$N ^{3-}$
- C$O ^{2-}$
- D$Mg ^{2+}$
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(Round off to the NearestInteger)
[Use:Atomicmasses:$Na:23.0\,u \mathrm{O}: 16.0 \,\mathrm{u} \quad \mathrm{H}: 1.0 \,\mathrm{u}$, Density of $\mathrm{H}_{2} \mathrm{O}: 1.0 \,\mathrm{~g} \,\mathrm{~cm}^{-3}$ ]

$NH _{2} CN _{( s )}+\frac{3}{2} O _{2}( g ) \rightarrow N _{2( g )}+ O _{2}( g )+ H _{2} O _{(l)}$
is ............ $kJ$. (Rounded off to the nearest integer)
[Assume ideal gases and $\left. R =8.314\, J\, mol ^{-1} K ^{-1}\right]$

$C{O_{2(g)}} + {H_{2(g)}} \to C{O_{(g)}} + {H_2}{O_{(g)}}$ .....$KJ$
$\text{Cu}^{2+}/\text{ Cu}=+0.34;\text{Ag}^+/\text{ Ag}=+0.80\text{V}$