The correct statements regarding H₂ as a fuel are
(a) It produces less pollutant than petrol
(b) A cylinder of compressed dihydrogen weighs ~30 times more than a petrol tank producing the same amount of energy
(c) Dihydrogen is stored in tanks of metal alloys like NaNi₅
(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively

(a) H₂​ produces less pollution as compared to petrol because on combustion it does not produce carbon monooxide.

(b) A cylinder of compressed dihydrogen weighs 30 times more than a petrol tank producing the same amount of energy. It has higher calorific value.

(c) Dihydrogen is stored in tanks of metal alloys.

(d) On combustion, the value of energy released per gram of liquid dihydrogen is 142 kJ.