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Regarding lanthanide contraction, some statements are given
a) It arises because of the poor shielding effect of 5f-electrons
b) The atomic radii and ionic radii steadily decrease from Ce to Lu
c) The crystal structures and other properties are similar
d) The separation of lanthanides from one another is difficult from their salt solutions.
The correct statements are

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a,c,d

b,c,d

a,b,c

a,b,d

answer is B.

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Detailed Solution

Statement a is false as the lanthanide contraction arises because of the poor shielding effect of 4f-electrons and not 5f-electrons.

Therefore, Option B is the correct answer

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