Tritium is an isotope of

Given below are two reactions involved in the commercial production of dihydrogen $(H_2)$. The two reactions are carried out at temperatures $T_1$ and $T_2$ respectively:
$C_{(s)} + H_2O_{(g)} \xrightarrow{T_1} CO_{(g)} + H_{2(g)}$
$CO_{(g)} + H_2O_{(g)} \xrightarrow{T_2} CO_{2(g)} + H_{2(g)}$
The temperatures $T_1$ and $T_2$ are correctly related as:

Reaction between the following pairs will produce $H_2$ except:

The reaction of diborane in diethylether with $\underline{X}$ gives metal borohydride. $X$ is a

Hydrogen behaves as an oxidising agent when it reacts with:

Hydrogen can be prepared by the action of dil. $H_2SO_4$ on