Which of the following statements is not true about borax?
- AThe molecular formula is $Na_2B_4O_7 \cdot 10H_2O$.
- BCrystalline borax contains a tetranuclear unit $[B_4O_5(OH)_4]^{2-}$.
- CIt hydrolyses to give an acidic solution.
- DIt is a white crystalline solid.
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