Which of the following statement concerning Lanthanoid is incorrect?

All Lanthanoids are highly dense metals.

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Most characteristic oxidation state of Lanthanide elements is +3.

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The ionic radii of trivalent Lanthanides steadily increase with increase in the atomic number

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Lanthanoids are separated from one another by ion exchange methods

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Solution

The correct option is B The ionic radii of trivalent Lanthanides steadily increase with increase in the atomic number
The ionic radii of trivalent Lanthanides steadily decreases with increase in the atomic number. Lanthanoids are generaly separated from one another by ion exchange methods.

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Similar questions

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 +} . . . . .)

1

2

L a (O H)_{3}

L u (O H)_{3}

3

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