Which rocket propellants do not require an external combustion initiator?

Liquid propellant

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Solid propellant

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Gas propellant

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Cryogenic propellant

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Solution

The correct option is D Cryogenic propellant
Cryogenic propellant do not need an external ignition agent. Once the fuels and its oxidizer is mixed in the combustion chamber, an automatic ignition starts.

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