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Ammonia forms the complex \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) with copper ions in alkaline solution but not in acidic solution. The reason for this is that :
\( \mathrm{P} \)
(a) in alkaline solution \( \mathrm{Cu}(\mathrm{OH})_{2} \) is precipitated which is soluble in excess of alkali
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(b) copper hydroxide is amphoteric substance
(c) in acidic solution hydration protects \( \mathrm{Cu}^{2+} \) ions
(d) in acidic solution protons are coordinated with ammonia molecules forming \( \mathrm{NH}_{4}^{+} \)ions
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