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Nitrogen Compounds - Ammonia (Class-XII)
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Ammonia is used in detection of $Cu^{2+}$ ion because:
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A
aqueous solution of $NH _{3}$ reacts with $Cu^{2+}$ ion to form deep blue coloured complex
💡 Explanation:
Ammonia acts as a Lewis base due to the presence of lone pair of on the nitrogen atom.so,it can form coordinate bond transition metal cations to from complex compounds.Ammonia reacts with a solution of $Cu^{2+}$ to from a deep blue coloured complex.The reaction for the above complex compound can be written as follows:
$Cu^{2+}(aq) + 4 NH _3(aq)\rightarrow [Cu(NH _3) _4]^{2+}(aq)$
Deep Blue
Hence option A is correct.