Passage of Ammonia gas through copper sulphate solution forms pale blue precipitate of ___ .

Q. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of:

Q. Which of the following gas when bubbled through copper sulphate solution form a deep blue coloured solution?

Q. $S_1$: AgCl with liquid ammonia forms a complex $\left[Ag\right(N{H}_3{)}_2{]}^{+}$.
$S_2$: Ammonium dichromate on heating decomposes to give nitrogen and a green colored compound.
$S_3$: CaNCN on hydrolysis produces a white precipitate and a gas which turns filter paper moistened with copper sulphate solution deep blue.