A) \[Ca{{C}_{2}}\] and graphite
B) \[CaC{{N}_{2}}\] and graphite
C) \[Ca{{(CN)}_{2}}\] and graphite
D) \[CaC{{N}_{2}}+{{N}_{2}}\]
Correct Answer: B
Solution :
Nitrolim is \[CaC{{N}_{2}}\] + graphite. It is used as a fertilizer. In soil it first changes into \[CaC{{O}_{3}}\] and cyanamide \[(N{{H}_{2}}CN).\] Cyanamide upon hydrolysis yield ammonia. \[\text{Ca}{{\text{C}}_{\text{2}}}\text{+}{{\text{N}}_{\text{2}}}\xrightarrow{\text{1370K}}\underbrace{\text{CaNCN+C}}_{\text{Nitrolim}}\text{;}\] \[\Delta H=-304.2kJ\]
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