First slide

Borax

Question

Number of bridged $B - O - B$ and terminal $B - OH$ bonds present in tetraborate ion are respectively

Moderate

A

4,5
B

5,4
C

4,4
D

3,4

Solution

Tetraborate ion is a tetranuclear complex. It has 5 bridged $B - O - B$ bonds and 4 $terminal B - OH$ bonds.
Two Boron atoms involve in ${sp}^{2}$ hybridization and remaining two Boron atoms invove in ${sp}^{3}$ hybridization.

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