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Question
Pick out the wrong statement ?
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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