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)]

Statements about heavy water are given below:

(A) Heavy water is used in exchange reactions for the study of reaction mechanisms.

(B) Heavy water is prepared by exhaustive electrolysis of water

(C) Heavy water has higher boiling point than ordinary water.

(D) Viscosity of \(\mathrm{H}_{2} \mathrm{O}\) is greater than \(\mathrm{D}_{2} \mathrm{O}\).

Choose the most appropriate answer from the options given below:

[JEE Main 2021, 26 Feb (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

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

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)]