Before adding the reagents of group III, the solution is heated with some concentrated HNO3 in order — Qualitative and Quantitative Analysis Chemistry Question
Question
Before adding the reagents of group III, the solution is heated with some concentrated HNO3 in order to:
Answer: A
💡 Solution & Explanation
Group III reagent (NH4OH in presence of NH4Cl) precipitates Fe3+ completely as Fe(OH)3, but Fe2+ is not completely precipitated. Conc. HNO3 oxidises Fe2+ to Fe3+.
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