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Question

The only cations present in a slightly acidic solution areFe3+,Zn2+ and Cu2+. The reagent, added in excess to this solution, that would identify and separate Fe3+ in one step is:



Your Answer
A

2MHCl

Correct Answer
B

6M NH3

Your Answer
C

6M NaOH

Your Answer
D

H2S(gas)


Solution

The correct option is B

6M NH3


Fe3+dil.NH3−−−−excessFe(OH)3                                 pptZn2+dil.NH3−−−−excess[Zn(NH3)4]2+Cu2+dil.NH3−−−−excess[Cu(NH3)4]2+

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