Electrolysis of fused sodium hydride liberates hydrogen at the

The correct statements among $(a)$ to $(d)$ regarding $H_2$ as a fuel are:
$(a)$ It produces fewer pollutants than petrol.
$(b)$ $A$ cylinder of compressed dihydrogen weighs $\sim 30$ times more than a petrol tank producing the same amount of energy.
$(c)$ Dihydrogen is stored in tanks of metal alloys like $NaNi_5$.
$(d)$ On combustion,the values of energy released per gram of liquid dihydrogen and $LPG$ are $142$ and $50 \ kJ,$ respectively.

Which of the following is a hydride?

$NaH$ is an example of:

Which of the following statements is incorrect regarding saline hydrides?

$H_2SO_4$ acts as a dehydrating agent in its reaction with: