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  4. If metal ions of group III are precipitated by NH4 Cl and NH4 OH without prior oxidation by conc. HNO3.........is not completely precipitated.

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Q. If metal ions of group III are precipitated by $NH_4 Cl$ and $NH_4 OH$ without prior oxidation by conc. $HNO_3$.........is not completely precipitated.

IIT JEEIIT JEE 1984Organic Chemistry – Some Basic Principles and Techniques

Solution:

Heating chloride salt with $K_2 Cr_2 O_7$ in conc. $H_2 SO_4$ gives off a deep vapour of chromyl chloride $(CrO_2 Cl_2).$