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NEET2016Chemistryp Block Elements (Group 13 & 14)Actual

Assertion : H ₃ BO ₃ is a weak acid. Reason: Water extracts the proton of H ₃ BO ₃ .

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

H ₃ BO ₃ is a very weak monobasic acid (K_a=5.6 10⁻¹⁰ ) but it does not act as a proton donor. It behaves as a Lewis acid i.e., it accepts a pair of electrons from OH ⁻ ion of H ₂ O . H - OH + B ( OH )₃ [ B ( OH )₄ ]⁻+ H ⁺

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