First slide
Qualitative analysis

Why Al3+,  Fe+3,  Cr+3 are grouped at one place together for qualitative analysis


Fe3++NH4OH  +NH4ClFeOH3

Which is insoluble in  NH3

Al3++NH4OH  +NH4ClAlOH3

Which is insoluble in NH3

Cr3++NH4OH+  NH4ClCrOH3

Which is insoluble in NH3

As the solubility product of their hydroxides is less.

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