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Q.

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.
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