The correct formula of borax is

  • A
    $Na_2[B_4O_4(OH)_3] \cdot 9 H_2O$
  • B
    $Na_2[B_4O_5(OH)_4] \cdot 8 H_2O$
  • C
    $Na_2[B_4O_6(OH)_5] \cdot 7 H_2O$
  • D
    $Na_2[B_4O_7(OH)_6] \cdot 6 H_2O$

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