Same group elements u and v have $62.5\%$ and $27.7\%$ valence electrons respectively from its maximum capacity of its valency shell. They form X and Y molecule with hydrogen respectively. Select the correct statement with respect to X and Y.

Here,

$62.5\%$ of $8=5\to \mathrm{N}$;                                                              

Thus, the molecule is ${\mathrm{NH}}_3$ with $s{p}^{\mathit{3}}$ hyb.            

Also, $27.7\mathrm{\%}$ of $18=5\to \mathrm{P}$

Thus, the molecule will be ${\mathrm{PH}}_3$ with $p^{\mathit{3}}$ hybridization.     

For ${\mathrm{NH}}_3$ and  ${\mathrm{PH}}_3$ all the given statements are correct.