Assertion :Assertion: $N_{2}$ is less reactive than $P_{4}$ Reason: Reason: Nitrogen has more electron gain enthalpy than phosphorus.

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 C Assertion is correct but Reason is incorrect
Nitrogen gas has complete octet for both the atoms and it is unreactive due to the presence of strong triple bond.On the other hand phosphorous has bonds with unstable angle strains compared to that of nitrogen due to which it burns quickly,hence easily reacts.
Nitrogen has lower electron gain enthalpy than phosphorous.
Hence option C is correct answer.

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Assertion :Assertion: N2 is less reactive than P4 Reason: Reason: Nitrogen has more electron gain enthalpy than phosphorus.

Assertion :Assertion: $N_{2}$ is less reactive than $P_{4}$ Reason: Reason: Nitrogen has more electron gain enthalpy than phosphorus.