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NEET2004Chemistrys Block ElementsActual

Which of the following is only acidic in nature?

Options

  1. ABe ( OH )₂
  2. BMg ( OH )₂
  3. CB ( OH )₃
  4. DAl ( OH )₃

Correct answer

C. B ( OH )₃

Step-by-step solution

B ( OH )₃ in aqueous medium coordinates a molecule of water to form the hydrated species In this species, B ³⁺ ion, because of its small size, exercises a high polarizing power thereby pulling the sigma electron charge of the coordinated O atom towards itself. The coordinated oxygen, in turn, pulls the sigma electron charge of the OH bond of the attached H ₂ O molecule towards itself. This facilitates the removal of H ⁺ ion from the O - H bond, as shown below. Thus the solution of B ( OH )₃ in water acts as a weak

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