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JEE Main2009Chemistryd and f Block ElementsActual

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

Options

  1. ABecause of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in characte
  2. BThe ionic sizes of Ln (III) decrease in general with increasing atomic number.
  3. CLn (III) compounds are generally colourless.
  4. DLn (III) hydroxides are mainly basic in character.

Correct answer

C. Ln (III) compounds are generally colourless.

Step-by-step solution

Ln ⁺³ compounds are mostly coloured.

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