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Chemistry · PYQ NEET UG 2021

हिन्दी

Choose the INCORRECT statement among the following.

  1. A
    Most of the trivalent lanthanoid ions are colourless in the solid state.
  2. B
    Lanthanoids are good conductors of heat and electricity.
  3. C
    Actinoids are highly reactive metals, especially when finely divided.
  4. D
    Actinoid contraction is greater for element to element than lanthanoid contraction.
View Answer & Solution

Correct answer · Option A

Most of the trivalent lanthanoid ions are colourless in the solid state.

Explanation

Most trivalent lanthanoid ions are coloured due to \( \text{f-f} \) transitions both in solid state and in aqueous solution, making statement (1) incorrect.
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