How do we differentiate between Fe 3+ and Cr 3+ in qualitat…

Chemistry Redox Reaction General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

How do we differentiate between Fe 3+ and Cr 3+ in qualitative analysis of group III -

By taking excess of NH 4 OH

By increasing NH 4 + ion concentration

By decreasing OH – ion concentration

By addition of bromine water and NaOH

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(b, c, d)

By lowering the concentration of OH – Fe(OH) 3 remain precipitated but Cr(OH) 3 dissolved. In the presence of bromine water in the presence of excess of alkali Cr(OH) 3 dissolved to produce Na 2 CrO 4 .

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