A) \[C{{u}^{2+}}\]
B) \[{{\left[ Cu{{\left( N{{H}_{3}} \right)}_{4}} \right]}^{2+}}\]
C) \[{{\left[ Cu{{\left( N{{H}_{3}} \right)}_{6}} \right]}^{2+}}\]
D) \[{{\left[ Cu{{\left( N{{H}_{3}} \right)}_{2}} \right]}^{2+}}\]
Correct Answer: B
Solution :
[b] \[CuS{{O}_{4}}+4N{{H}_{3}}\to \left[ Cu{{\left( N{{H}_{3}} \right)}_{4}} \right]S{{O}_{4}}\] Blue complex due to \[Cu(N{{H}_{3}})_{4}^{2+}\]
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