Structure of \( \mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}...

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Structure of \( \mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O} \) contains :
P
(a) two triangular and two tetrahedral units
\( \mathrm{V} \)
(b) three triangular and one tetrahedral units
(c) all tetrahedral units
(d) all triangular units
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