Which of the following sets are correctly matched?

(i) $\mathrm{B}_2 \mathrm{H}_6$ - electron deficient hydride

(ii) $\mathrm{NH}_3$ - electron precise hydride

(iii) $\mathrm{H}_2 \mathrm{O}$ - electron rich hydride

Which of the following is /are ionic in nature?

(i) $\mathrm{GeF}_4$

(ii) $\mathrm{SnF}_4$

(iii) $\mathrm{PbF}_4$

The correct option is

The number of lone pairs of electrons on the central atom of $\mathrm{BrF}_5, \mathrm{XeO}_3, \mathrm{SO}_2$ respectively are

The shape of colourless neutral gas formed on thermal decomposition of ammonium nitrate is