question_answer

A metal 'M' reacts with nitrogen gas to afford \['{{M}_{3}}N'.'{{M}_{3}}N'\] on heating at high temperature gives back 'M' and on reaction with water produces a gas 'B'. Gas 'B' reacts with aqueous solution of \[CuS{{O}_{4}}\]to form a deep blue compound. 'M' and 'B' respectively are : [JEE Online 08-04-2017]

A)  Li and \[N{{H}_{3}}\]                     

B)  Na and \[N{{H}_{3}}\]

C)  Ba and \[{{N}_{2}}\]                      

D)  Al and \[{{N}_{2}}\]

Correct Answer: A

Solution :