MCQ
Compound $A$ and $B$, both were treated with $NaOH,$ producing a single compound $C$.


- ✓

- B

- C

- D








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$(I)$ $MnSO_4.4H_2O$ $(II)$ $FeSO_4.7H_2O$
$(III)$ $NiSO_4.6H_2O$ $(IV)$ $CuSO_4.5H_2O$