A test for complete romovel of `Cu^(2+)` ions form a solution of `Cu_((aq.))^(2+)` is to add `NH_(3(aq.))`. A buke colour signifies the fomaltionn of complex `[Cu(NH_(3))_(4)]^(2+)` having `K_(f) = 1.1 xx 10^(13)` and thus confirms the presence of `Cu^(2+)` in solution. `250 mL` of `0.1 M CuSO_(4(aq.))` is electrolysed by passing a current of `3.512` ampere for `1368` second. After passage of this passage of this charge sufficient quantity of `NH_(3(aq.))` is added to electrolysed solution maintaining `[NH_(3)] = 0.10 M`. If `[Cu(NH_(3))_(4)]^(2+)` is detectable up to its concentration as low as `1 xx 10^(-5)`, would a blue colour be shown by the electrolysed solution on addition of `NH_(3)`.

Answer

Show blue colour