Q.

Reason of lanthanoid contraction is

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a

negligible screening effect of ' f' -orbitals

b

increasing nuclear charge

c

decreasing nuclear charge

d

decreasing screening effect

answer is A.

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Detailed Solution

Due to poor shielding effect of 4f-orbitals, nucleus will exert a strong attraction and size of atom or ion goes on decreasing as move in the series with increase in atomic number.
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