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Pick out the wrong statement. | |
A. | Addition of methane to the furnace atmosphere reduces decarburising by hydrogen. [Wrong Answer] |
B. | Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures. [Wrong Answer] |
C. | Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness. [Wrong Answer] |
D. | none of these. [Correct Answer] |