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AIIMS 2012
Exam
AIIMS
Year
2012
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

AIIMS 2012 · Chemistry · Chemical Bonding and Molecular Structure

Assertion : La(OH)_3 is more basic than Lu(OH)_3 . Reason : Size of...

Assertion : La(OH)3\mathrm{La}(\mathrm{OH})_3 is more basic than Lu(OH)3\mathrm{Lu}(\mathrm{OH})_3.Reason : Size of Lu3+\mathrm{Lu}^{3+} increases and shows more covalent character.

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

Due to lanthanide contraction, the size of Lu3+\mathrm{Lu}^{3+} is decreased and therefore Lu(OH)3\mathrm{Lu}(\mathrm{OH})_3 shows more covalent character (Small cation, more is covalent character - Fajan's rule). Thus La(OH)3\mathrm{La}(\mathrm{OH})_3 is more ionic and thus more basic.
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