JEE Main 2019 — Hydrogen Question with Solution
From: JEE Main 2019 (Online) 11th January Morning Slot
Question
(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.
Choose an option
Show full solutionCorrect option: C
Step-by-step explanation
(I) H2 is a 100% pollution free fuel. So, option (I) is correct.
(II) Molecular weight of H2(2u).
molecular weight of butane,
C4H10 (LPG) [58u].
So, compressed H2 weighs 30 times more than a petrol tank and option (b) is correct.
(III) NaNi5, Ti - TiH2 etc. are used for storage of H2 in small quantities. Thus, option (c) is correct.
(IV) On combustion values of energy released per gram of liquid dihydrogen (H2) : 142 kJ g1, and for LPG : 50 kJ g1. So, option (d) is incorrect.
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