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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?
  • ✓
    $\ce{La(OH)_3}$ is less basic than $\ce{Lu(OH)_3}.$
  • 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

Correct option: A.
$\ce{La(OH)_3}$ is less basic than $\ce{Lu(OH)_3}.$
$\ce{La(OH)_3}$​ is less basic than $\ce{Lu(OH)_3}$​ is an incorrect statement.
Basic strength $\ce{La(OH)_3 > Lu(OH)_3}$
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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