The salt used for performing the 'bead' test in qualitative inorganic analysis is
- A$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
- B$FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O$
- C$Na(NH_4)HPO_4 \cdot 4H_2O$
- D$CaSO_4 \cdot 2H_2O$
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