-p-Block elements - I — Chemistry STD 11 Science — Question

${N_2} + 3{H_2} \longrightarrow NH_3$

$X$ $ = 1{s^2},\,\,2{s^2}2{p^6},\,\,3{s^2}3{p^6},\,\,4{s^2}$

and $Y$ $ = 1{s^2},\,\,2{s^2}2{p^6},\,\,3{s^2}3{p^5}$

The compound formed by combination of $X$ and $Y$ is

$(I)$ electron affinity of $Y$ is high    $(II)$ ionization energy of $X$ is low

$(III)$ lattice energy of $XY$ is high   $(IV)$ lattice energy of $XY$ is low

Choose the correct code