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The correct statements among (a) to (d) regarding H2 as a fuel are: (a) It produces less pollutants 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.

1. (a) and (c) only
2. (b) and (d) only
3. (a), (b) and (c) only
4. (b), (c) and (d) only

Correct answer: (a) and (c) only

Solution

Option (a) is correct because hydrogen combustion produces only water vapor, resulting in fewer pollutants compared to petrol, which emits carbon dioxide and other harmful substances. Option (c) is also accurate as metal alloys like NaNi5 are indeed used for storing dihydrogen due to their ability to absorb hydrogen efficiently.

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