Which of the following sets are correctly matched?
$(i)$ $B_2H_6$ - electron deficient hydride
$(ii)$ $NH_3$ - electron precise hydride
$(iii)$ $H_2O$ - electron rich hydride

The maximum sum of the number of neutrons and protons in an isotope of hydrogen is

Lithium hydride can be used to prepare other useful hydrides. Beryllium hydride is one of them. Suggest a route for the preparation of beryllium hydride starting from lithium hydride. Write chemical equations involved in the process.

$2BeCl_2 + LiAlH_4 \rightarrow X + LiCl + AlCl_3$

In which of the following reactions,hydrogen is acting as an oxidising agent?

Observe the following reactions:
$I$. $N_{2(g)} + 3H_{2(g)} \xrightarrow[773 \ K, \ 200 \ atm]{X} 2NH_{3(g)}$
$II$. $CO_{(g)} + H_{2}O_{(g)} \xrightarrow[673 \ K]{Y} CO_{2(g)} + H_{2(g)}$
$III$. $CH_{4(g)} + H_{2}O_{(g)} \xrightarrow[1270 \ K]{Z} CO_{(g)} + 3H_{2(g)}$
Catalysts $X$,$Y$,and $Z$ respectively are: