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JEE Advanced2014Chemistryp Block Elements (Group 13 & 14)Actual

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

Options

  1. AIt behaves as a weak acid in water due to self ionization.
  2. BAcidity of its aqueous solution increases upon addition of ethylene glycol.
  3. CIt has a three dimensional structure due to hydrogen bonding.
  4. DIt is a weak electrolyte in water.

Correct answer

B. Acidity of its aqueous solution increases upon addition of ethylene glycol.

Step-by-step solution

A] H 3 B O 3 is a weak monobasic Lewis acid. H 3 B O 3 + H - O H ⇌ B O H 4 - + 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 B O H 4 - . C] It has a planar sheet like structure due to hydrogen bonding. D] H 3 B O 3 is a weak electrolyte in water.

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