A) \[Cu{{(OH)}_{2}}\]
B) \[[Cu{{(N{{H}_{3}})}_{4}}{{(OH)}_{2}}]\]
C) \[[Cu{{(N{{H}_{3}})}_{4}}]S{{O}_{4}}\]
D) \[CuO\]
Correct Answer: C
Solution :
When copper sulphate is treated with excess of ammonia solution, it gives a deep blue solution due to the formation of tetramine copper (II) sulphate complex. \[CuS{{O}_{4}}+4N{{H}_{3}}\xrightarrow{{}}\,\underset{\begin{smallmatrix} \begin{array}{*{35}{l}} tetraamine\text{ }copper\text{ }\left( II \right) \\ sulphate\text{ }deep \\ \end{array} \\ blue\text{ }complex \end{smallmatrix}}{\mathop{[Cu{{(N{{H}_{3}})}_{4}}]S{{O}_{4}}}}\,\] Note - Tetramine copper (II) sulphate is used for making artificial, rayon, artificial silk, cupra silk.
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