Borax in its crystal structure possesses:

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(B) The chemical formula of borax is $Na_{2}[B_{4}O_{5}(OH)_{4}] \cdot 8H_{2}O$.The polyanion unit is $[B_{4}O_{5}(OH)_{4}]^{2-}$.In this structure,th

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$2$ tetrahedral and $2$ planar triangular units

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(B) The chemical formula of borax is $Na_{2}[B_{4}O_{5}(OH)_{4}] \cdot 8H_{2}O$.The polyanion unit is $[B_{4}O_{5}(OH)_{4}]^{2-}$.In this structure,there are $4$ boron atoms.Two boron atoms are $sp^{2}$ hybridized,which results in a trigonal planar geometry.Two boron atoms are $sp^{3}$ hybridized,which results in a tetrahedral geometry.Therefore,the structure contains $2$ tetrahedral and $2$ planar triangular units.

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