Question

In $C{O}_2$, $I_3^{-}$, $N{O}_2^{-}$ and $N{O}_2^{+}$,
if the sum of bond pairs (single bond) on the central atom of all the molecules given is $x$ and the sum of all lone pairs on the central atom of all the molecules given is $y$ then, $(x+y)$ is:

Answer 1

$C{O}_2$ has $2bp+0lp$

$I_3^{-}$ has $2bp+3lp$

$N{O}_2^{-}$ has $2bp+1lp$

$N{O}_2^{+}$ has $2bp+0lp$

$\therefore$
$x=2+2+2+2=8$
$y=0+3+1+0=4$
$x+y=8+4=12$