The correct statements among (a) to (d) regarding H₂ as a fuel are :
I. It produces less pollutants than petrol.
II. A cylinder of compressed dihydrogen weights -30 times more than a petrol tank producing the same amount of energy.
III. Dihydrogen is stored in tanks of metal alloys like Na-Ni.
IV. On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively.

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I, II and III only

II, III and IV only

II and IV only

I and III only

answer is A.

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Detailed Solution

(I) H₂ is a 100% pollution free fuel. So, option (I) is correct.
(II) Molecular weight of H₂(2u).
= 1/29 x molecular weight of butane,
C₄H₁₀ LpG) [58u].
So, compressed H₂ weighs - 30 times more than a petrol tank and option (2) is correct.
(III) Na-Ni, Ti-TiH₂ etc. are used for storage of H₂ in smallr quantities. Thus, option (3) 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 (4) is incorrect.