A) \[{{250}^{o}}C\]
B) \[{{300}^{o}}C\]
C) \[{{500}^{o}}C\]
D) \[{{190}^{o}}C\]
Correct Answer: C
Solution :
Nature of adsorption of nitrogen on the surface of iron depands upon the temperature. At \[{{190}^{o}}C\], nitrogen is physically adsorbed on the iron surface as \[{{N}_{2}}\] molecules. When temperature is further adsorbed up to \[{{500}^{o}}C\]and above, then nitrogen is chemically adsorbed on the iron surface as nitride.
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