Question

The blue complex formed on addition of cone. $ N{{H}_{4}}OH $ solution to a $ C{{u}^{2+}} $ salt solution has the structure:

• A. $ {{[Cu\,{{(N{{H}_{3}})}_{2}}]}^{2+}} $
• B. $ {{[Cu\,{{(N{{H}_{3}})}_{4}}]}^{2+}} $
• C. $ {{[Cu\,{{(N{{H}_{4}})}_{4}}]}^{2+}} $
• D. $ {{[Cu\,{{(N{{H}_{4}})}_{2}}]}^{2+}} $

Answer 1

Answer: (B)

Copper salt, when dissolved in ammonical solution, forms a deep blue complex, named tetra amine copper (II) ion. $ C{{u}^{2+}}+4N{{H}_{4}}OH\xrightarrow{{}}\,\underset{\begin{smallmatrix} \text{Tetraamine}\,\text{copper}\, \\ \,\,\,\,\,\,\text{(II)}\,\text{ion}\,\text{(blue)} \end{smallmatrix}}{\mathop{{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}}}\,+4{{H}_{2}}O $