Number of sigma bonds in ${\mathrm{P}}_4{\mathrm{O}}_{10}$ is:

The ratio of $\sigma$ to $\mathrm{\pi }$ bonds in naphthalene is

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.