Verified Solution • 2025–26 Session moderate

QJEEM19Ch3545: JEE Main 2019 Chemistry - Class 11 JEEM19Ch3545 Solution: The correct statements among (a) to (d) regarding H 2 as a fuel …

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 ∼\sim 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.

Multiple Choice Options

  • A (a) and (c) only
  • B (b) and (d) only
  • C (a), (b) and (c) only
  • D (b), (c) and (d) only

Step-by-Step Verified Solution

(I) H2 is a 100% pollution free fuel. So, option (I) is correct.

(II) Molecular weight of H2(2u).

=129×= {1 \over {29}} \times molecular weight of butane,

C4H10 (LPG) [58u].

So, compressed H2 weighs ∼\sim 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 g −- 1, and for LPG : 50 kJ g −- 1. So, option (d) is incorrect.

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