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Q.
$ CuSO_{4} $ dissolves in $ NH_{3} $ due to formation of
AMUAMU 2002
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.
$CuSO _{4}+4 NH _{3} \longrightarrow \underset{\text{tetraamine copper (II) sulphate deep blue complex}}{\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4}}$
Tetramine copper (II) sulphate is used for making artificial rayon, artificial silk, cupra silk.