Question

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

• A. 4 and 5
• B. 4 and 3
• C. 5 and 4
• D. 5 and 3

Answer 1

Answer: (A)

The structure of borax $H_4{B}_4{O}_9$ is shown below

Thus, number of boron atoms are $4$ and $B—O—B$ units are $5$.