Assertion :To get the required mass flow rate, the only option was to cool the propellants down to cryogenic temperatures (183 C 253 C), converting them to liquid form. Reason: All cryogenic rocket engines are also either liquid-propellant rocket engines or hybrid rocket engines.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Both assertion and reason are correct but reason is not correct explanation for assertion. Because hybrid rocket consist of the fuel with mixture of solid and liquid/gas is cannot be liquefied. So, cryogenic cannot be done here.

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Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

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