Why Al3+, Fe+3, Cr+3 are grouped at one place together for qualitative analysis
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a
as their carbonates are insoluble in NH3
b
as their hydroxide are insoluble in NH3
c
as their sulphides are insoluble in acid
d
as their sulphides are soluble in acid
answer is B.
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Detailed Solution
Fe3++NH4OH + NH4Cl→FeOH3Which is insoluble in NH3Al3++NH4OH + NH4Cl→AlOH3Which is insoluble in NH3Cr3++NH4OH + NH4Cl→CrOH3Which is insoluble in NH3As the solubility product of their hydroxides is less.