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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
hich of the following statement is not correct?
  • A
    La(OH)3​ is less basic than Lu(OH)3​.
  • B
    In Lanthanide series ionic radius of Ln+3 ions decreases.
  • C
    La is actually an element of transition series rather Lanthanide.
  • D
    Aomic radius of Zr and Hf are same because of Lanthanide contraction.
✓

Answer

  1. La(OH)3​ is less basic than Lu(OH)3​.

Explanation:

La(OH)3​ is less basic than Lu(OH)3​ is an incorrect statement.

Basic strength La(OH)3​ > Lu(OH)3​

Due to Lanthanide contraction as the size of the lanthanide ions decreases from La+3 to Lu+3, the covalent character of hydroxides increases and hence basic strength decreases.

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