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_______ is the process of saturating the surface layer of steel with nitrogen by heating.

(a) Nitriding

(b) Normalising

(c) Nitrating

(d) Tempering

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Correct option is (a) Nitriding

For explanation: Nitriding is the process of saturating the surface layer of steel with nitrogen by heating. This process makes the steel hard and increases its resistance to corrosion.

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