Q62 · CSIR-NET Chemistry, December 2012
Paper: CSIR-NET December 2012 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Medium
Boric acid is a weak acid in aqueous solution. But its acidity increases significantly in the presence of ethylene glycol, because
(a)ethylene glycol releases additional $\mathrm{H}^{+}$
(b)$\mathrm{B(OH)_4^{-}}$ is consumed in forming a compound with ethylene glycol.
(c)ethylene glycol neutralizes $\mathrm{H}^{+}$released by boric acid.
(d)Boric acid dissociates better in the mixed-solvent.
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Glycol traps B(OH)₄⁻ as a chelate ester, driving ionisation (b).
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