Which of the following statements concerning lanthanide elements is false?

All lanthanides are highly dense metals.

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The characteristic oxidation state of lanthanide elements is +3.

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Lanthanides are separated from one another by ion exchange method.

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

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Solution

The correct option is D Ionic radii of trivalent lanthanides steadily increase with an increase in the atomic number.
Ionic radii decreases with increasing atomic number in Lanthanide series. So, the ionic radii of trivalent Lanthanide will also follow the same property.

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L a (O H)_{3}

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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}

L u (O H)_{3} .

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

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