MCQ
Some salts although containing two different metallic elements give test for one of them in solution. Such salts are :-
- ✓complex salt
- Bdouble salt
- Cnormal salt
- Dnone of these
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(Rounded-off to the nearest integer)
[Given $K _{ b }$ for $\left.\left( H _{2} O \right)=0.52\, K\, kg\, mol ^{-1}\right]$

In the given reaction sequence $B$ and $C$ are :