Question

Assertion – Nitriding is the process of heating steel in presence of $N_2$ to convert it completely into a chemical compound - iron nitride.

Reason: The surface of steel becomes hard after nitriding process

• A. Both assertion and reason are correct and the reason is correct expansion to assertion
• B. Both assertion and reason are correct but reason is not the correct expansion of assertion
• C. Assertion is correct but reason are wrong
• D. Assertion is incorrect but reason is correct
• E. Both assertion and reason are wrong

Answer 1

The correct option is D

Assertion is incorrect but reason is correct

Nitriding is a heat treatment process that diffuses nitrogen into the surface of a metal to create a hardened surface but not its complete conversion into a chemical compound. Hence, the assertion is false. These processes are most commonly used on low carbon, low alloy steels.Thus the reason is correct.