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CGP EDU Academic Team
Published on: August 12, 2026
How do we differentiate between Fe 3+ and Cr 3+ in group III rd ?
Text Solution
Verified by ExpertsThe correct answer is:
D
NH 4 OH 
NH 4+ + OH –
NH 4 Cl — → NH 4+ + Cl –
Common ion effect of NH 4+ supresses the dissociation of NH 4 OH. Thus low concentration of OH – is obtained which is just sufficient to exceed the K sp of Fe(OH) 3 (as K sp of Fe(OH) 3 ) is less than Cr(OH) 3 .
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