Question

Aqueous solution of which of the following boron compounds will be strongly basic in nature?

Options

• NaBH₄

• LiBH₄

• B₂H₆

• Na₂B₄O₇ 

Answer 1

Na₂B₄O₇ 

Explanation:

Na₂B₄O₇ gives H₃BO₃ and NaOH in water. 

Reaction: $$\mathrm{Na}{\phantom{A}}_2\mathrm{B}{\phantom{A}}_4\mathrm{O}{\phantom{A}}_7+7\mathrm{H}{\phantom{A}}_2\mathrm{O}⟶\underset{\mathrm{Weak}\mathrm{acid}}{4\mathrm{H}{\phantom{A}}_3\mathrm{BO}{\phantom{A}}_3}+\underset{\mathrm{Strong}\mathrm{base}}{2\mathrm{NaOH}}$$

An aqueous solution of borax Na₂B₄O₇ is basic in nature as it on hydrolysis produces H₃BO₃ (a weak acid) and NaOH (a strong base).