KVPY Sample Paper KVPY Stream-SX Model Paper-31

Calcium imide on hydrolysis gives gas [B] which on oxidation by bleaching powder gives gas [C]. Gas [C] on reaction with magnesium give compound [D] which on hydrolysis gives again gas [B]. Identify [B], [C] and [D]

A) \[N{{H}_{3}},\,\,{{N}_{2}},\,\,M{{g}_{3}}{{N}_{2}}\]

B) \[{{N}_{2}},\,\,N{{H}_{3}},\,\,MgNH\]

C) \[{{N}_{2}},\,\,{{N}_{2}}{{O}_{5}},\,\,Mg{{(N{{O}_{3}})}_{2}}\]

D) \[N{{H}_{3}},\,\,N{{O}_{2}},\,\,Mg{{(N{{O}_{2}})}_{2}}\]

Correct Answer: A

Solution :

\[Ca(NH)+2{{H}_{2}}O\to Ca{{(OH)}_{2}}+N{{H}_{3}}(g)\]

\[\underset{(B)}{\mathop{2N{{H}_{3}}}}\,+3CaOC{{l}_{3}}\to \underset{(C)}{\mathop{{{N}_{2}}(g)}}\,+3CaC{{l}_{2}}+3{{H}_{2}}O\]

\[\underset{(C)}{\mathop{{{N}_{2}}(g)}}\,+3Mg\to \underset{(D)}{\mathop{M{{g}_{3}}{{N}_{2}}}}\,\]

\[\underset{(D)}{\mathop{M{{g}_{3}}{{N}_{2}}}}\,+\underset{(B)}{\mathop{6{{H}_{2}}O}}\,\to 3Mg{{(OH)}_{2}}+2N{{H}_{3}}\]