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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:12

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
7 years ago
(Ln) +3 compound are generally coloured due to partially filled f orbital which permits f-f transition.
rest all the statements are correct:-
Because of the large size of the Ln (III) ions the bonding in its compounds is predominently ionic in characte
The ionic sizes of Ln (III) decrease in general with increasing atomic number.
Ln (III) hydroxides are mainly baisc in character.

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