Question

Which of the following statements is/are true about borax?

• A. Two boron atoms are bonded with 4 oxygen atoms while the other two boron atoms are bonded with 3 oxygen atoms
• B. 5 oxygen atoms are bridged between boron atoms
• C. The aqueous solution of borax forms an acidic buffer
• D. Borax can be formed when Colemanite is treated with $N{a}_{2}C{O}_3$ solution

Answer 1

Answer: (A), (B), (D)

The correct options are
A Two boron atoms are bonded with 4 oxygen atoms while the other two boron atoms are bonded with 3 oxygen atoms
B 5 oxygen atoms are bridged between boron atoms
D Borax can be formed when Colemanite is treated with $N{a}_{2}C{O}_3$ solution

Structure of borax:


An aqueous solution of borax is alkaline and it can also act as a buffer.

$\underset{Colemanite}{C{a}_2{B}_6{O}_{11}}+2N{a}_{2}C{O}_3⟶\underset{Borax}{N{a}_2{B}_4{O}_7}+2NaB{O}_2+2CaC{O}_3$