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CORRECT-INCORRECT STATEMENT
Borax is actually made of two tetrahedral and two triangular units joined together and should be written as:
\[
\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}
\]
Consider the following statements about borax:
A. Each boron atom has four \( \mathrm{B}-\mathrm{O} \) bonds.
B. Each boron atom has three \( \mathrm{B}-\mathrm{O} \) bonds.
C. Two boron atoms have four \( \mathrm{B}-\mathrm{O} \) bonds while other two have three B-O bonds.
D. Each boron atom has one \( -\mathrm{OH} \) group.
Select correct statement(s):
(1) A, B
(2) B, C
(3) C, D
(4) A, C
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