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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