Question

Magnesium on heating in air gives $\left(A\right)$ and $\left(B\right)$. On reaction with water $\left(B\right)$ gives colourless gas $\left(C\right)$. $\left(C\right)$ when passed through $CuS{O}_4$ solution gives a blue coloured solution $\left(D\right)$. The blue solution is:

• A. $MgO$
• B. $M{g}_3{N}_{2}S{O}_3.H_{2}O$
• C. $N{H}_3$
• D. $\left[Cu\right(N{H}_3{)}_4]S{O}_4.H_{2}O$

Answer 1

The correct option is D $\left[Cu\right(N{H}_3{)}_4]S{O}_4.H_{2}O$

Option $\left(D\right)$ is correct.

Magnesium on strong heating reacts with nitrogen of air.

$Mg+O_2\to MgO\left[A\right]+M{g}_3{N}_2\left[B\right]$

$M{g}_3{N}_2\left[B\right]+H_{2}O\to Mg(OH{)}_2+N{H}_3[C]$

$N{H}_3+CuS{O}_4\left(aq\right)\to \left[Cu\right(N{H}_3{)}_4]S{O}_4.H_{2}O[D]$