The sum of $\pi$-bonds present in peroxodisulphuric acid and pyrosulphuric acid is:

The $B-F$ bond dissociation energy in $BF_3$ is $646 \, kJ \, mol^{-1}$,whereas the $C-F$ bond dissociation energy in $CF_4$ is $515 \, kJ \, mol^{-1}$. Which of the following is the correct reason for the $B-F$ bond dissociation energy being higher than the $C-F$ bond dissociation energy?

Number of $S-S$ bonds in $H_2S_nO_6$ is:

The number of electrons in the valence shell of the central atom of a molecule is $8$. The molecule is

What is the total number of planes in $CH_4$ that contain the maximum number of atoms?

Which of the following statements is not correct?