Q70 / 180 · AIIMS 2007 · Chemistry

Assertion : Magnetic moment of Dy is the highest among the lanthanoids. Reason : Orbital motion contributes magnetic moment.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

\(4 f\) electrons are well screened thus their spins and their orbital motions about their nuclei contribute to the magnetic moment. Hence, even Dy has highest magnetic moment.

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

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