Which of the following could act as a propellant for rockets?

Liquid nitrogen + liquid oxygen

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Liquid hydrogen + liquid oxygen

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Liquid oxygen + liquid argon

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Liquid hydrogen + liquid nitrogen

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Solution

The correct option is B Liquid hydrogen + liquid oxygen
The primary performance advantage of liquid propellants is due to the oxidizer.
Liquid hydrogen and liquid oxygen are used as propellent for rocket. $H_{2} (l)$ has a low mass and high enthalpy of combustion whereas oxygen is a strong supporter of combustion

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