First slide

13th group or boron group

Question

Number of tetrahedral boron atoms in peroxo-borate obtained by the following reaction.
$2 N a B O_{2} + 2 H_{2} O_{2} + 6 H_{2} O$ $\to N a_{2} [B_{2} {(O H)}_{4} {(O_{2})}_{2}] 6 H_{2} O$

Moderate

A

2
B

3
C

1
D

0

Solution

Following is the structure of sodium peroxo-borate. It finds its use as a whitener in washing powder.
Both the B atoms are forming four bonds and so it is tetrahedral.

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