When excess of dilute \( \mathrm{NH}_{4} \mathrm{OH} \) is added to... VIDEO
When excess of dilute \( \mathrm{NH}_{4} \mathrm{OH} \) is added to an aqueous solution of copper sulphate an intense blue colour is
\( \mathrm{P} \) developed. This is due to the formation of :
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(a) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \)
(b) \( \mathrm{Cu}(\mathrm{OH})_{2} \)
(c) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \)
(d) \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \)
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