A metal M on heating in nitrogen gas gives Y . Y on treatment with H_2 O gives a colourless gas which when passed through CuSO_4 solution gives a blue colour. Y is

Correct answer: C. Mg_3 ~N_2 M 3 Mg +N_2 Y Mg_3 N_2 aligned & Y Mg_3 N_2 +6 H_2 O 3 Mg(OH)_2+ colourless 2 NH_3 & CuSO_4+4 NH_3 [Cu(NH_3)_4] SO_4 & aligned Blue complex

JEE Main 201212 MayOnline

Exam: JEE Main
Year: 2012
Date: 12 May
Mode: Online
Subject: Chemistry
Chapter: s Block Elements

JEE Main 2012 · 12 May · Online · Chemistry · s Block Elements

A metal M on heating in nitrogen gas gives Y . Y on treatment with...

A metal

M

on heating in nitrogen gas gives

Y

Y

on treatment with

\mathrm{H}_2 \mathrm{O}

gives a colourless gas which when passed through

\mathrm{CuSO}_4

solution gives a blue colour.

Y

Options

A $\mathrm{NH}_3$
B $\mathrm{Mg}\left(\mathrm{NO}_3\right)_2$
C $\mathrm{Mg}_3 \mathrm{~N}_2$
D $\mathrm{MgO}$

Correct answer

C. $\mathrm{Mg}_3 \mathrm{~N}_2$

Step-by-step solution

\underset{M}{3 \mathrm{Mg}}+\mathrm{N}_2 \longrightarrow \underset{Y}{\mathrm{Mg}_3} \mathrm{ N}_2

\begin{aligned} & \underset{Y}{\mathrm{Mg}_3 \mathrm{ N}_2}+6 \mathrm{H}_2 \mathrm{O} \longrightarrow 3 \mathrm{Mg}(\mathrm{OH})_2+\underset{\text{ colourless }}{2 \mathrm{NH}_3 \uparrow} \\ & \mathrm{CuSO}_4+4 \mathrm{NH}_3 \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right] \mathrm{SO}_4 \\ & \end{aligned}

Blue complex

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