The only cations present in a slightly acidic | vedclass

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(B) When excess $6 \ M \ NH_3$ is added to the solution containing $Fe^{3+}$,$Zn^{2+}$,and $Cu^{2+}$:$1$. $Fe^{3+}$ reacts with $NH_3$ and $H_2O$ to f

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$6 \ M \ NH_3$

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(B) When excess $6 \ M \ NH_3$ is added to the solution containing $Fe^{3+}$,$Zn^{2+}$,and $Cu^{2+}$:$1$. $Fe^{3+}$ reacts with $NH_3$ and $H_2O$ to form a brown precipitate of $Fe(OH)_3$,which is insoluble in excess $NH_3$.$2$. $Cu^{2+}$ reacts with excess $NH_3$ to form a deep blue soluble complex $[Cu(NH_3)_4]^{2+}$.$3$. $Zn^{2+}$ reacts with excess $NH_3$ to form a colorless soluble complex $[Zn(NH_3)_4]^{2+}$.Thus,$Fe^{3+}$ is separated as a precipitate,while $Cu^{2+}$ and $Zn^{2+}$ remain in the solution.

The only cations present in a 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

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