Which of the following statements concerning lanthanide elements is false?

Lanthanides are separated from one another by ion-exchange method

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

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All lanthanides are metals

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The most characteristic oxidation state of a lanthanide element is +3

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Solution

The correct option is B Ionic radii of trivalent lanthanides steadily increases with increase in the atomic number
All lanthanides are solids at room temperature. They have a usual oxidation state of +3. Also, they can be separated by the ion exchange method. Ionic radii of trivalent lanthanides steadily decreases with the increase in atomic number and the phenomenon is known as lanthanide contraction.

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The atomic and ionic radii (M $^{3 +}$ ions) of Lanthanide elements decrease with increase in atomic number. This effect is called:

(L a^{3 +}, C e^{3 +}, P r^{3 +} . . . . .)

L a (O H)_{3}

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L u^{3 +}, Y b^{2 +} a n d C e^{4 +}

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