The nodal plane in the $\mathrm{\pi }$-bond of ethene is located in:

What is true about $\mathrm{CO}$ molecule?

$\mathrm{a}.$ It has two lone pairs.

$\mathrm{b}.$ It has one dative bond.

$\mathrm{c}.$ It has two $\mathrm{\pi }$ bonds.

$\mathrm{d}.$ It has one $\mathrm{\sigma }$ bond.

The table shown below gives the bond dissociation energies ${\left(\mathrm{E}\right)}_{\mathrm{diss}}$ for single covalent bonds of carbon atoms with element $\text{'}\mathrm{A}\text{'}, \text{'}\mathrm{B}\text{'}, \text{'}\mathrm{C}\text{'}$ and $\text{'}\mathrm{D}\text{'}$. Which element has the smallest atoms?

$\begin{array}{|lc|}\hline \text{ Bond }& {\mathrm{E}}_{\text{diss }}\left({\mathrm{kJmol}}^{-1}\right)\\ \mathrm{C}-\mathrm{A}& 240\\ \mathrm{C}-\mathrm{B}& 328\\ \mathrm{C}-\mathrm{C}& 276\\ \mathrm{C}-\mathrm{D}& 485\\ \hline\end{array}$

Consider the following statement and arrange in the order of true / false.

${\mathrm{S}}_1$: In ${\mathrm{SnCl}}_2$, the bonding takes place in the ground state and the bond angle $\mathrm{Cl}-\mathrm{Sn}-\mathrm{Cl}$ is slightly less than $120°$.

${\mathrm{S}}_2$: The molecular geometry of ${\mathrm{XeF}}_7^{+}$ is pentagonal bipyramidal having two different $\mathrm{Xe}-\mathrm{F}$ bond lengths.

${\mathrm{S}}_3$: In ${\mathrm{SF}}_4$, the bond angles, instead of being $90°$ and $180°$, are $89°$ and $177°$ respectively due to the presence of a lone pair.

Select the correct statement for the sulphuric acid.

(I) It has high boiling point and viscosity.

(II) There are two types of bond lengths in its bivalent anion.

(III) $\mathrm{p\pi }-\mathrm{d\pi }$ bonding between sulphur and oxygen is observed.

(IV) Sulphur has the same hybridisation that is of boron in diborane.