Ammonia forms the complex [Cu(NH_3)_4]^{2+} w | vedclass

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(D) Ammonia $(NH_3)$ acts as a Lewis base due to the presence of a lone pair of electrons on the nitrogen atom. In an acidic solution,the high concent

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In acidic solution protons are coordinated with ammonia molecules forming $NH_4^+$ ions

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(D) Ammonia $(NH_3)$ acts as a Lewis base due to the presence of a lone pair of electrons on the nitrogen atom. In an acidic solution,the high concentration of $H^+$ ions leads to the protonation of ammonia: $NH_3 + H^+ \rightarrow NH_4^+$. The resulting ammonium ion $(NH_4^+)$ does not have a lone pair of electrons and therefore cannot act as a ligand to form a coordinate bond with the $Cu^{2+}$ ion. Thus,the formation of the complex $[Cu(NH_3)_4]^{2+}$ is inhibited in acidic media.

Ammonia forms the complex $[Cu(NH_3)_4]^{2+}$ with copper ions in alkaline solution but not in acidic solution. The reason for this is

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