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When excess of NH3(aq) is added to a blu...

When excess of `NH_3`(aq) is added to a blue solution containing Cu2+ ions

A

Solution turns red due to formation of `Cu^+` ions

B

Solution becomes red due to formation of `[Cu(NH_(3))_(4)]_(aq)^(2+)`

C

Solution become deep blue due to formation of `[Cu(NH_(3))_(4)]_(aq)^(2+)`

D

Solution becomes colourless due to excess colourless `NH_3`

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