The deep blue colour produced on adding excess of ammonia to copper sulphate is due to presence of

The deep blue colour produced on adding excess of ammonia to copper sulphate is due to presence of
  1. $\mathrm{Cu}^{2+}$
  2. $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}ight)_{4}ight]^{2+}$
  3. $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}ight)_{6}ight]^{2+}$
  4. $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}ight)_{2}ight]^{2+}$

Solution

$$
\begin{array}{l}
\text { } \mathrm{CuSO}_{4}+4 \mathrm{NH}_{3} ightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}ight)_{4}ight] \mathrm{SO}_{4}\\
\text { Blue complex due to } \mathrm{Cu}\left(\mathrm{NH}_{3}ight)_{4}^{2+}
\end{array}
$$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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