Given below are two statements :

Statement I : Boron is extremely hard indicating its high lattice energy.

Statement II : Boron has highest melting and boiling point compared to its other group members.

In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements :

Statement I : $$\mathrm{SbCl}_{5}$$ is more covalent than $$\mathrm{SbCl}_{3}$$

Statement II: The higher oxides of halogens also tend to be more stable than the lower ones.

In the light of the above statements, choose the most appropriate answer from the options given below :

Which one of the following pairs is an example of polar molecular solids?

One mole of $$\mathrm{P}_{4}$$ reacts with 8 moles of $$\mathrm{SOCl}_{2}$$ to give 4 moles of $$\mathrm{A}, x$$ mole of $$\mathrm{SO}_{2}$$ and 2 moles of $$\mathrm{B} . \mathrm{A}, \mathrm{B}$$ and $$x$$ respectively are :