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MHT CET202527 Apr 2025Evening ShiftChemistryd and f Block ElementsActual

Which from following hydroxide acts as strongest base ?

Options

  1. ALa ( OH )₃
  2. BLu ( OH )₃
  3. CCe ( OH )₃
  4. DSm ( OH )₃

Correct answer

A. La ( OH )₃

Step-by-step solution

The basicity of lanthanide hydroxides decreases across the series from La(OH)₃ to Lu(OH)₃ . This trend results from lanthanide contraction , where the ionic radius of M³⁺ ions decreases across the lanthanide series. Smaller ionic radii lead to higher charge density and increased polarizing power of the cations. This strengthens the M-O bond while weakening the O-H bond in M(OH)₃ , making the hydroxide more acidic and less basic. The given lanthanide order is La Since La(OH)₃ corresponds to the first and largest cat

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