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

1. Liquid oxygen + liquid argon
2. Liquid hydrogen + liquid oxygen
3. Liquid nitrogen + liquid oxygen
4. Liquid hydrogen + liquid nitrogen

Correct answer: Liquid hydrogen + liquid oxygen

Solution

Liquid hydrogen and liquid oxygen are commonly used as rocket propellants because they undergo a highly efficient combustion reaction, producing a large amount of thrust and water vapor as the only byproduct, making them both powerful and environmentally friendly.

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