Q9 / 155 · WBJEE 2016 · Chemistry

Which of the following statements regarding Lanthanides is false?

  • A
    All lanthanides are solid at room temperature
  • B
    Their usual oxidation state is +3
  • C
    They can be separated from one another by ion-exchange method
  • Correct answer
    D
    Ionic radii of trivalent lanthanides steadily increases with increase in atomic number

Solution

The option (d) is false as lonic radi of trivalent lanthanides decreases with increase in atomic number due to lanthanoid contraction.

Hence, the correct answer is option: 'D'.

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