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MolSynapse / Question bank / p-Block Elements: Groups 13 and 14 / Boron compounds: diborane, boric acid, borax, boron halides

JEE Advanced levelSingle correct optionDifficulty 3 of 3pb040

The anion of borax is $[B X_{4} O X_{5} (OH) X_{4}] X^{2 -}$ . The sum of the number of $s p^{3}$ hybridised boron atoms and the number of terminal hydroxyl groups in this anion is

A6
B4
C8
D10

Answer: A

The anion has two trigonal planar

s p^{2}

boron atoms and two tetrahedral

s p^{3}

boron atoms; each boron carries one terminal OH, giving 4 OH groups. The sum is

2 + 4 = 6

.

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