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

JEE Main levelSingle correct optionDifficulty 2 of 3pb174

In the anion $[B X_{4} O X_{5} (OH) X_{4}] X^{2 -}$ present in borax, the numbers of $s p^{2}$ and $s p^{3}$ hybridised boron atoms are respectively

A3 and 1
B2 and 2
C0 and 4
D4 and 0

Answer: B

The anion has two trigonal boron atoms (three O neighbours,

s p^{2}

) and two tetrahedral boron atoms (four O neighbours,

s p^{3}

). Hence the numbers are 2 and 2.

Practice p-Block Elements: Groups 13 and 14 More on Boron compounds: diborane, boric acid, borax, boron halides

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