Q. Which gas is used as a fuel in a rocket?
Answer: Hydrogen
Notes: Mostliquidchemical rocketsuse two separate propellants: a fuel and an oxidizer. Typical fuels include kerosene, alcohol, hydrazine and its derivatives, and liquid hydrogen. Many others have been tested andused. Oxidizers include nitric acid, nitrogen tetroxide, liquidoxygen, andliquidfluorine.