Q7 / 60 · JEE Advanced 2014 (Paper 1) · Chemistry

The correct statement(s) for orthoboric acid is/are

  • A
    It behaves as a weak acid in water due to self ionization.
  • Correct answer
    B
    Acidity of its aqueous solution increases upon addition of ethylene glycol.
  • C
    It has a three dimensional structure due to hydrogen bonding.
  • Correct answer
    D
    It is a weak electrolyte in water.

Solution

A] H3BO3 is a weak monobasic Lewis acid.
H3BO3+H-OH⇌BOH4-+H+…..(i)
B] Equilibrium (i) is shifted in forward direction by the addition of syn-diols like ethylene glycol which forms a stable complex with BOH4- .

Figure
C] It has a planar sheet like structure due to hydrogen bonding.
D] H3BO3 is a weak electrolyte in water.

Hence, the correct answer is options: 'B', 'D'.

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