Question

Aqueous solution of borax reacts with two mol of acids. This is because of -

• A. Formation of 2 mol of only
• B. Formation of 1mol of only
• C. Formation of 1 mol each of and
• D. Formation of 2 mol each of and , of which only reacts with acid

Answer 1

The correct option is D

Formation of 2 mol each of and , of which only reacts with acid

$N{a}_2{B}_4{O}_7+7H_{2}O\to 2B(OH{)}_3+2Na[B\left(OH{)}_4\right]$

$B(OH{)}_{3}or{H}_{3}B{O}_3$ is an acid and does not react with acid.

Hence $Na\left[B\right(OH{)}_4]$ reacts with acid.