Which of the following could act as apropellant for rockets?

Which of the following could act as apropellant for rockets?
  1. Liquid oxygen $+$ liquid argon
  2. Liquid hydrogen + liquid oxygen
  3. Liquid nitrogen $+$ liquid oxygen
  4. Liquid hydrogen $+$ liquid nitrogen

Solution

Liquid hydrogen and liquid oxygen are used as excellent fuel for rockets. $\mathrm{H}_2(l)$ has low mass and high enthalpy of combustion whereas oxygen is a strong supporter of combustion

Asked in: JEE Main 2003

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