The correct increasing order of the total number of $\sigma$ and $\pi$ bonds in the following structures is:
$I. \ H_2S_2O_6, \ II. \ H_2SO_3, \ III. \ H_2SO_5$

Which one of the following molecules contains both ionic and covalent bonds?

Identify the set of molecules/ions that are isoelectronic.

In which of the following compounds is the octet rule not followed?

Which of the following molecules or ions is not possible?

Which of the following statements is true with respect to $H_2O$,$NH_3$ and $CH_4$?
$A.$ The central atoms of all the molecules are $sp^3$ hybridized.
$B.$ The $H-O-H$,$H-N-H$ and $H-C-H$ angles in the above molecules are $104.5^{\circ}$,$107.5^{\circ}$ and $109.5^{\circ}$ respectively.
$C.$ The increasing order of dipole moment is $CH_4 < NH_3 < H_2O$.
$D.$ Both $H_2O$ and $NH_3$ are Lewis acids and $CH_4$ is a Lewis base.
$E.$ $A$ solution of $NH_3$ in $H_2O$ is basic. In this solution,$NH_3$ and $H_2O$ act as a Lowry-Bronsted base and acid respectively.
Choose the correct answer from the options given below: