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BITSAT 2016
Exam
BITSAT
Year
2016
Subject
Chemistry
Chapter
d and f Block Elements

BITSAT 2016 · Chemistry · d and f Block Elements

Knowing that the chemistry of lanthanoids(Ln) is dominated by its...

Knowing that the chemistry of lanthanoids(Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

Options

  1. AThe ionic size of \ln (III) decrease in general with increasing atomic number
  2. B\ln (III) compounds are generally colourless.
  3. C\ln (III) hydroxide are mainly basic in character.
  4. DBecause of the large size of the \ln (III) ions the bonding in its compounds is predominantly ionic in character.

Correct answer

B. \ln (III) compounds are generally colourless.

Step-by-step solution

Most of the Ln3+\mathrm{Ln}^{3+} compounds except La3+\mathrm{La}^{3+} and Lu3+\mathrm{Lu}^{3+} are coloured due to the presence of ff -electrons.
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