Hydrogen

In which of the following reactions of hydrogen peroxide acts as an oxidizing agent (either in acidic, alkaline, or neutral medium)?
(i) $2F{e}^{+2}+H_2{O}_2\to$
(ii) $2{\mathrm{MnO}}_4^{-}+6{\mathrm{H}}^{+}+5{\mathrm{H}}_2{\mathrm{O}}_2\to$
(iii) $I_2+H_2{O}_2+2O{H}^{-}\to$
(iv) $M{n}^{+2}+H_2{O}_2\to$

Given below are two statements :
Statement-I : Methane and steam passed over a heated Ni catalyst produces hydrogen gas.
Statement-II : Sodium nitrite reacts with \(\mathrm{NH}_4 \mathrm{Cl}\) to give \(\mathrm{H}_2 \mathrm{O}, \mathrm{N}_2\) and \(\mathrm{NaCl}\).
In the light of the above statements, choose the most appropriate answer from the options given below :

[JEE Main 2023, 11 Apr (Shift 1)]

Among the following, the correct statements are:
I. LiH, Be$H_2$ and Mg$H_2$ are saline hydrides with significant covalent character
II. Saline hydrides are volatile
III. Electron - precise hydrides are Lewis bases
IV. The formula for chromium hydride is CrH