Assertion :Nitriding is the process of heating steel in presence of $N_{2}$ to form iron nitride. Reason: The surface of steel becomes hard after nitriding process.

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 and Reason is correct

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Solution

The correct option is D Assertion is incorrect and Reason is correct
Nitriding:
It is a process of heating mild steel containing 1 percent Al in an atmosphere of $N H_{3}$ at 550°C to 600°C. Both Fe and Al react with $N_{2}$ formed by the dissociation of $N H_{3}$ to form nitride which produces a compact and hard surface.

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Assertion: Nitriding is the process of heating steel in presence of $N_{2}$ to convert it completely into iron nitride.

Reason: The surface of steel becomes hard after nitriding process

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Reason: The surface of steel becomes hard after nitriding process

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