The correct statements regarding $H_{2}$ as a fuel are:
1. It produces less pollution than petrol.
2. A cylinder of compressed dihydrogen weights 30 times more than a petrol tank, producing the same amount of energy.
3. Dihydrogen is used as a rocket fuel in space research.
4. On combustion, the values of energy released per gram of liquid dihydrogen and LPG are 50 and 142KJ, respectively.

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1,2,3 only

2,3,4 only

2 and 4 only

1 and 3 only

answer is A.

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Detailed Solution

(1) $H_{2}$ is 100% pollution free fuel
(2) Molecular weight of $H_{2} (2 u) = \frac{1}{29} \times$ molecular weight of butane $(58 u)$
(3) $N a N i_{5}, T i - T i H_{2}$ are used for storage of gas in small quantities.
(4) On combustion, values of energy released per gram of liquid $H_{2} = 142 K J / g m$ and for LPG = 50 KJ/gm.

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