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

Draw Lewis structures of the following molecules and ions: $H_2S$,$SiCl_4$,$BeF_2$,$CO_3^{2-}$,$HCOOH$.

Which of the following does not obey the octet rule?

Which of the statements given below is incorrect?

The isoelectronic pair is

Identify the correct statement$(s)$ from the following:
$a$) Dipole moment of $NH_3$ is more than $NF_3$
$b$) $SF_4$ is square planar
$c$) $SnCl_4$ is more covalent than $SnCl_2$
$d$) $In_2SO_4$ sulphur atom has expanded octet