The only cations present in a slightly acidic | vedclass

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Question

$Fe^{3+}$ does not form complex compound with $NH_3$ whereas $Cu^{2+}$ and $Zn^{2+}$ form complex with $NH_3$.

Vedclass · Accepted Answer

$6\,M\,NH_3$

Vedclass · Answer

$Fe^{3+}$ does not form complex compound with $NH_3$ whereas $Cu^{2+}$ and $Zn^{2+}$ form complex with $NH_3$.

The only cations present in a slightly acidic solutions 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