Resonance hybrid of nitrate ion is :-

Which is correct statement?

As the $\%\mathrm{s}$-character of a hybrid orbital decreases ______.

(I) The bond angle decreases
(II) The bond strength increases
(III) The bond length increases
(IV) The size of orbital increases

Which of the following compounds have the same no. of lone pairs with their central atom :-

$\left(\mathrm{I}\right) {\mathrm{XeF}}_5^{-}$

$\left(\mathrm{II}\right) {\mathrm{BrF}}_3$

$\left(\mathrm{III}\right) {\mathrm{XeF}}_2$

(IV) Triple methylene