The correct statements among (a) to (d) regarding as a fuel are:
(a) it produces less pollutants than petrol
(b) A cylinder of compressed dihydrogen weighs times more than a petrol tank producing the same amount of energy.
(c) Dihydrogen is stored in tanks of metal alloys like
(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 times more than a petrol tank producing the same amount of energy.
(c) Dihydrogen is stored in tanks of metal alloys like
(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ , respectively.
- (A)(b) and (d) only
- (B)(a) and (d) only
- (C)(b), (c) and (d) only
- (D)(a), (b) and (c) only✓ Correct
Answer: (D)
Solution
Weigh each claim in turn. Hydrogen burns to give only water, so it does pollute far less than petrol, making statement (a) correct. Storing the same energy as compressed hydrogen does need a very heavy high-pressure cylinder, so (b) is correct. Hydrogen is indeed held in interstitial metal-alloy hydrides of the type, so (c) is correct in substance. Statement (d) reverses the real numbers: liquid hydrogen releases about and LPG about , not the other way round, so (d) is wrong. The correct statements are (a), (b) and (c).
JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Single correct option