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What is not true about borax?
(A) Molecular formula is \( \mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O} \)
(B) Crystalline borax contains tetranuclear units of
\[
\left[\mathrm{B}_{4} \mathrm{O}_{5}\left(\mathrm{OH}_{4}\right)\right]^{2-}
\]
(C) It hydrolyses in water giving alkaline solution
(D) It is a white crystalline solid.
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