Assertion :Combustion of $N_{2}$ to give $N O$ is exothermic. Reason: Heat of combustion are always exothermic.

Read the above assertion and reason and choose the correct option regarding it.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
The heat of combustion is always exothermic.

$\frac{1}{2} N_{2} + \frac{1}{2} O_{2} ⟶ N O; Δ H = + v e$ . It is due to high bond energy of $N_{2}$ .

Note: This equation does not represent the heat of combustion of $N_{2}$ (Partial combustion).

Hence, Assertion is incorrect but the Reason is correct.

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