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Question

CaCO3(s)ΔA(s)+B(g)
A(s)carbon,ΔC(s)+D(g)
(E)+H2O+(B)(F)+CaCO3
(F)+H2O(G)
Identify (E) and (G):

A
E=CaCN2,G=NH2CONH2
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B
E=CaCN,G=NH2CONH2
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C
E=Ca2CN2,G=NHCOONH2
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D
E=Ca2CN4,G=NHCOONH2
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Solution

The correct option is A E=CaCN2,G=NH2CONH2
CaCO3(s)ΔCaO(s)+CO2(g)
CaO(s)carbon,ΔCaC2(s)+CO(g)
CaCN2+H2O+CO2NH2CN+CaCO3
NH2CN+H2ONH2CONH2
So E=CaCN2,G=NH2CONH2
Hence option A is correct.

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