Question

Assertion :$H_{3}B{O}_3$ is monobasic Lewis acid but salt ${Na}_{3}B{O}_3$ exist. Reason: $H_{3}B{O}_3$ reacts with $NaOH$ to give ${Na}_{3}B{O}_3$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

$H_{3}B{O}_3$ is monobasic Lewis acid due to an incomplete octet of boron.
But $N{a}_{3}B{O}_3$ forms by replacement of all H atoms in acid.
Reaction:
$H_{3}B{O}_3$ reacts with $NaOH$ and gives
$B{\left(OH\right)}_3+NaOH\to Na\left[B{\left(OH\right)}_4\right]$