A) Lanthanides are separated from one another by ion exchange method.
B) The ionic radii of trivalent lanthanides steadily increase with increase in atomic number.
C) All lanthanides are highly dense metals.
D) Most characteristic oxidation state of lanthanides is+3.
Correct Answer: B
Solution :
[b] The ionic radii of trivalent lanthanides decreases progressively with increase in atomic number. This decrease is known as lanthanide contraction.
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