Chemistry - CHEMICAL BONDING Question with Solution | TestHub

In $\mathrm{NSi}{\left({\mathrm{CH}}_3\right)}_3$, Si uses its vacant d-orbital for back bonding with lone pair electrons of central N atom, hence, has less tendency to release its electrons, hence, less basic. Ortho-nitrophenol shows intramolecular hydrogen bonding while para-nitrophenol shows intermolecular hydrogen bonding hence ortho isomer is more volatile. ${\mathrm{Na}}^{+}$is smaller than ${\mathrm{Ca}}^{+2}$, hence, ${\mathrm{Na}}_2{\mathrm{CO}}_3$ has more lattice energy than ${\mathrm{CaCO}}_3$. Hence, ${\mathrm{Na}}_2{\mathrm{CO}}_3$ is more thermally stable. Water has high density than ice because ice forms cage like structure and large vacancies are created in ice.