Question

$\text{CuS}{\text{O}}_{\text{4}}$ reacts with $\text{N}{\text{H}}_{\text{4}}\text{OH}$ to give deep blue complex of:

• A. cupra ammonium hydroxide
• B. cupra ammonium sulphate
• C. Both (a) and (b)
• D. none of these

Answer 1

Answer: (B)

When $\text{CuS}{\text{O}}_{\text{4}}$ reacts with $\text{N}{\text{H}}_{\text{4}}\text{OH,}$ deep blue colour is formed due to the formation of cupra ammonium sulphate. $\underset{\text{Copper}\text{sulphate}}{\text{CuS}{\text{O}}_4}+\underset{\left(\begin{array}{c}\text{ammonium}\\ \text{hydroxide}\end{array}\right)}{N{H}_{4}OH}\to \underset{\begin{array}{c}\text{Cupra}\text{ammonium}\\ \text{sulphate}\end{array}}{[Cu{(N{H}_3)}_4]S{O}_4}$