Statement-1: Few drops of HNO_3 are added bef | vedclass

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(A) In the qualitative analysis of cations,the $III^{rd}$ group consists of $Fe^{+3}$,$Al^{+3}$,and $Cr^{+3}$. Before adding the group reagent ($NH_4O

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Both Statement-$1$ and Statement-$2$ are correct.

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(A) In the qualitative analysis of cations,the $III^{rd}$ group consists of $Fe^{+3}$,$Al^{+3}$,and $Cr^{+3}$. Before adding the group reagent ($NH_4OH$ in the presence of $NH_4Cl$),it is necessary to ensure that all iron is present in the $Fe^{+3}$ state. If iron is present as $Fe^{+2}$,it will not precipitate as $Fe(OH)_3$ effectively with the $III^{rd}$ group reagent. Therefore,concentrated $HNO_3$ is added to oxidize $Fe^{+2}$ to $Fe^{+3}$ according to the reaction: $6Fe^{+2} + 2HNO_3 + 6H^+ \rightarrow 6Fe^{+3} + 2NO + 4H_2O$. Thus,both Statement-$1$ and Statement-$2$ are correct.

Statement-$1$: Few drops of $HNO_3$ are added before proceeding to $III^{rd}$ group.
Statement-$2$: For the oxidation of $Fe^{+2} \rightarrow Fe^{+3}$.

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Statement-$1$: Few drops of $HNO_3$ are added before proceeding to $III^{rd}$ group. Statement-$2$: For the oxidation of $Fe^{+2} \rightarrow Fe^{+3}$.