The crystalline form of borax has\

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Professor PC Thomas Classes · Answer

(a, c, d) : The formula of borax is $\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}ight] \cdot 8 \mathrm{H}_{2} \mathrm{O}$ which contains the tetranuclear unit $\left[\mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}ight]^{2-}$.\ Only two B atoms lie in the same plane as two B atoms are $s p^{2}$ hybridized and other two B atoms are $s p^{3}$ hybridized.\