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  4. In the structure of borax, the numbers of boron atoms and B— O — B units , respectively are

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Q. In the structure of borax, the numbers of boron atoms and $B— O — B$ units , respectively are

KVPYKVPY 2013The p-Block Elements

Solution:

The structure of borax $H_4 B_4 O_9$ is shown below
image
Thus, number of boron atoms are $4$ and $B— O—B$ units are $5$.