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Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ? (1) Because of the large size of the Ln (III) ions the bonding in its compounds is predominently ionic in character (2) The ionic sizes of Ln(III) decrease in general with increasing atomic number. (3) Ln (III) compounds are generally colourless. (4) Ln (III) hydroxides are mainly baisc in character.

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ?
(1) Because of the large size of the Ln (III) ions the bonding in its compounds is predominently ionic in character
(2) The ionic sizes of Ln(III) decrease in general with increasing atomic number.
(3) Ln (III) compounds are generally colourless.
(4) Ln (III) hydroxides are mainly baisc in character.

Grade:11

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
11 months ago
Dear student

The answer is option 3

Regards
Vikas TU
14149 Points
11 months ago
The ionic sizes of Ln(III) decrease in general with increasing atomic number.
Ln(III) compounds are generally colourless
Ln(III)hydroxides are mainly basic in character
Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in character.
Solution :
Ln(III)compounds are generally coloured due to partly filled f-orbitals which permit f-f transition.

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