Which of the combination is used in liquid form of rocket fuel -
(I) Liquid He + liquid $H_{2}$
(II) Liquid $H_{2} +$ liquid $O_{2}$
(III) Liquid $N_{2} H_{4} +$ liquid $H_{2} O_{2}$

Question

Which of the combination is used in liquid form of rocket fuel - (I) Liquid He + liquid H 2 ​ (II) Liquid H 2 ​ + liquid O 2 ​ (III) Liquid N 2 ​ H 4 ​ + liquid H 2 ​ O 2 ​

TestHub · Accepted Answer

Liquid rocket fuels require a fuel and an oxidizer combination.

Liquid H₂ with liquid O₂ is used as a rocket propellant because it produces high energy:

$2 H_{2} + O_{2} \to 2 H_{2} O$

Liquid N₂H₄ (hydrazine) with liquid H₂O₂ is also used as rocket fuel.

Liquid He + liquid H₂ is not used as a rocket fuel combination.

Therefore, correct combinations are:

II, III

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