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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 exess to this solution would identify and separate `Fe^(3+)` in one step is:

A

2 M HCl

B

`6M NH_(3)`

C

`6M NaOH`

D

`H_(2)S` gas

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The correct Answer is:
D
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