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Which of the following statements concerning lanthanide elements is correct ?

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Lanthanides are seperated from one another by an exchange method

All lanthanides are dense metals

More characteristic oxidation state of lanthanide elements is + 3

Ionic radii of trivalent lanthanides steadily increases with increase in the atomic number

answer is A, C, D.

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Detailed Solution

Lanthanide are difficult to separate because of having similar atomic sizes but can be seperated using ion-exchange method. As the atomic size does not increasing appreciably but atomic number does, therefore they are dense elements.

Lanthanides can show +2, +3, and +4 oxidation state where +3 is the most stable one.

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