The correct statements among (a) to (d) regarding \(\mathrm{H_2}\) as a fuel are :
(a) It produces less 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 \(\mathrm{NaNi_5}\).
(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 KJ, respectively.
(a) It produces less 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 \(\mathrm{NaNi_5}\).
(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 KJ, respectively.
Show Hint
- (a) and (c) only
- (b) and (d) only
- (a), (b) and (c) only
- (b), (c) and (d) only
The Correct Option is C
Solution and Explanation
(b) True: because of its low density, compressed \(\mathrm{H_2}\) cylinders are bulky and heavy; a cylinder weighs about 30 times more than a petrol tank giving the same energy (NCERT).
(c) True: \(\mathrm{H_2}\) is stored as metal hydrides in alloys such as \(\mathrm{NaNi_5}\) (as given in the statement).
(d) False: the energy per gram is about 142 kJ for dihydrogen and about 50 kJ for LPG, the statement has them interchanged.
Correct statements: (a), (b) and (c) only.
Answer: (3) (a), (b) and (c) only
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