Which one of the following reagents can be used for differentiating the nitrates of `Cu^(2+)` and `Bl^(3+)`?

Options

A. Excess of water
B. `NH_4OH` (excess)
C. Excess of KI
D. All of these

Answer

D

Explanation

(A)`Cu^(2+)+H_2O`(excess) `to` no change
`Bi^(3+)+NO_3^(-)+H_2O`(excess)`to BiO(NO_3)darr`(white)+`2H^+`
(B)`Cu^(2+)+4NH_4OHto[Cu(NH_3)_4]^(+2)`(deep blue)+`4H_2O`
`Bi^(3+)+3NH_4OHtoBi(OH)_3darr`(white)+`3NH_4^(+)`
( C)`Cu^(2+)+4I^(-)toCu_2I_2darr`(white)+`I_2`
`Bi^(3+)+4I^(-)to[BiI_4]^(-)`(orange colour solution)