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MHT CET2009Chemistryd and f Block Elements

Most basic hydroxide among the following is

Options

  1. ALu ( OH )₃
  2. BEu ( OH )₃
  3. CYb ( OH )₃
  4. DCe ( OH )₃

Correct answer

D. Ce ( OH )₃

Step-by-step solution

Due to lanthanide contraction, the size of M³⁺ ions [ie, Lu ³⁺, Eu ³⁺, Yb ³⁺ and Ce ³⁺ ] decreases and thus, the basic strength of their hydroxides decreases. The order of size of given M³⁺ ions is Ce ³⁺> Eu ³⁺> Yb ³⁺> Lu ³⁺ The order of basic strength of hydroxides is Ce ( OH )₃> Eu ( OH )₃> Yb ( OH )₃> Lu ( OH )₃ (most basic)

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