Q. On adding excess of $NH_{3}$ solution to $CuSO_{4}$ solution, the dark blue colour is due to
A) $\left\lbrack Cu\left( NH_{3} \right) \right\rbrack^{+}$
B) $\left\lbrack Cu\left( NH_{3} \right)_{4} \right\rbrack^{2 +}$
C) $\left\lbrack Cu\left( NH_{3} \right)_{2} \right\rbrack^{2 +}$
D) None of these
Explanation
(b)
$CuSO_{4} + 4NH_{3} \rightarrow \left\lbrack Cu\left( NH_{3} \right)_{4} \right\rbrack^{2 +}{SO}_{4}^{2 -}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.