Which of the following reactions give $H_2$ as one of the products? (Reactions are not balanced)
$I) NaBH_4 + I_2 \longrightarrow$
$II) B_2H_6 + N(CH_3)_3 \longrightarrow$
$III) Al + NaOH + H_2O \longrightarrow$
$IV) BF_3 + NaH \longrightarrow$

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:

Which of the following drying agents reacts with $CO_2$ and also removes moisture?

In all its properties,hydrogen resembles

Which of the following fuels has the maximum calorific value per gram?

Write the isotopes of hydrogen and specify the number of protons,electrons,and neutrons in each.