In the detection of group III cations (eq. `Al^(3+)`) in the qualitative analysis of salts, `NH_(4)Cl` is added before adding `NH_(4)OH`. This is meant
A
to provide a definitely basic medium
B
to suppress the ionisation of the `NH_(4)OH`
C
to cause the precipitation of the chlorides of group III cations
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BRILLIANT PUBLICATION-CHEMICAL AND IONIC EQUILIBRIUM-Level - III (Linked Comprehension Type Questions)
