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Question
Identify (X) to (Z) in the following sequence of reactions - 
CaO+C2000C−−−(X)+(Y)                   1100C+N2                            (z)hydrolysis−−−−−(P)gas
Options:
A .  (X)≡CaC2(Y)≡CO(Z)≡Ca3N2(P)≡NH3
B .  (X)≡CaC2(Y)≡C(Z)≡Ca(NH2)2(P)≡NH3
C .  (X)≡CaC2(Y)≡C(Z)≡CaCN2(P)≡NH3
D .  (X)≡CaC2(Y)≡CO(Z)≡CaCN2(P)≡NH3
Answer: Option D
:
D
X = CaC2, heating calcium carbide with N2 gives calcium cyanamide (CaCN2), which in turn liberates NH3on hydrolysis

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