In the solid state,$PCl_5$ exists as which of the following?

Total number of non-bonded electrons present in $NO_2^{-}$ ion based on Lewis theory is $........$

Which of the following contains both covalent and ionic bonds?

$BCl_3$ does not exist as a dimer,but $BH_3$ exists as a dimer $(B_2H_6)$ because:

$O-O$ bond length in $H_2O_2$ is $\underline{X}$ than the $O-O$ bond length in $F_2O_2$. The $O-H$ bond length in $H_2O_2$ is $Y$ than that of the $O-F$ bond in $F_2O_2$. Choose the correct option for $\underline{X}$ and $\underline{Y}$ from the given below.

The order of the average bond length of the given bonds is