An aqueous solution which is slightly acidic contain cations $F e^{3 +}$ , $Z n^{2 +}$ and $C u^{2 +}$ . The reagent that when added in excess to this solution would identify the separate $F e^{3 +}$ ion in one step is_________.

2 M H C l

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6 M N H_{3}

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6 M N a O H

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H_{2} S

gas

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Solution

The correct option is A $6 M N H_{3}$
Option (B) is correct.
The reagent that when added in excess to this solution would identify the separate $F e^{3 +}$ ion in one step is $6 M N H_{3}$
$F e^{3 +} + 3 N H_{4} O H ⟶ F e (O H)_{3} ↓ (r e d d i s h b r o w n) + 3 N H_{4}^{+}$
$C u^{2 +} + 4 N H_{3} ⟶ [C u (N H_{3})_{4}]^{2 +} (b l u e c o l o r s o l u b l e c o m p l e x)$
$Z n^{2 +} + 4 N H_{3} ⟶ [Z n (N H_{3})_{4}]^{2 +} (c o l o r l e s s s o l u b l e c o m p l e x)$

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An aqueous solution which is slightly acidic contain cations Fe3+, Zn2+ and Cu2+. The reagent that when added in excess to this solution would identify the separate Fe3+ ion in one step is_________.

An aqueous solution which is slightly acidic contain cations $F e^{3 +}$ , $Z n^{2 +}$ and $C u^{2 +}$ . The reagent that when added in excess to this solution would identify the separate $F e^{3 +}$ ion in one step is_________.