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Nitriding is the process of surface hardening of steel by treating it is an atmosphere of

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Nitriding is the process of surface hardening of steel by treating it is an atmosphere of

(a) NH3

(b) O3

(c) N2

(d) H2S

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Correct option (a) NH3

Explanation :

When steel is heated in presence of NH3, iron nitride on the surface of steel is formed which imparts a hard coating. This process is called nitriding.

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