question_answer

A metal X on heating in nitrogen gas gives Y, Y on treatment with \[{{H}_{2}}O\] gives a colourless gas which when passed through chloroplatinic acid produces yellow precipitate. 'Y' is

A) \[Mg{{(N{{O}_{3}})}_{2}}\]    

B) \[M{{g}_{3}}{{N}_{2}}\]

C) \[N{{H}_{3}}\]

D) \[MgO\]

Correct Answer: B

Solution :

[b]       \[M{{g}_{3}}{{N}_{2}}+6{{H}_{2}}O\to 3Mg{{(OH)}_{2}}+2N{{H}_{3}}\] \[{{H}_{2}}[PtC{{l}_{6}}]+2N{{H}_{3}}\to {{(N{{H}_{4}})}_{2}}[PtC{{l}_{6}}]\downarrow (yellow)\]