Pick out the wrong statement ?

Question

Options:

A . Addition of methane to the furnace atmosphere reduces decarburising by hydrogen

B . Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures

C . Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness

D . None of these

Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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