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The only cations present in the slightly...

The only cations present in the slightly acidic solution are `Fe^(3+),Zn^(2+) and Cu^(2+)`. The reagent that when added in excess to this solution would identify and separate `Fe^(3+)` in one step is:

A

2 M HCl

B

6 M `NH_3`

C

6 M NaOH

D

`H_2S` gas

Text Solution

Verified by Experts

The correct Answer is:
B
`Fe^(3+)+3NH_3+3H_2OtoFe(OH)_3 darr` (reddish-brown)+`3NH_4^+`
`Cu^(2+)+4NH_3 to [Cu(NH_3)_4]^(2+)`(deep blue solution)
`Zn^(2+)+4NH_3to[Zn(NH_3)_4]^(2+)`(colourless solution)
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