Which of the following statements regarding Lanthanides is false?

All lanethanides are solid at room temperature

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Their usual oxidation state is

+ 3

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They can be separated from one another by ion-exchange method

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

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Solution

The correct option is C Ionic radii of trivalent lanthanides steadily increases with increase in atomic number
The statement (D) regarding Lanthanides is false.
The ionic radii of trivalent lanthanides steadily decreases with increase in atomic number and the phenomenon is known as Lanthanoid contraction.

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Similar questions

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

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

L a (O H)_{3}

L u (O H)_{3} .

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