Which of the following salts is used in the bead test for the qualitative analysis of inorganic substances?

  • 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
    $CuSO_4 \cdot 5H_2O$

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