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Q.

Reason of lanthanide contraction is 

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a

Increasing nuclear charge

b

Decreasing nuclear charge

c

Decreasing screen effect 

d

Negligible screening effect of ‘f’ orbitals  

answer is D.

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Detailed Solution

: Lanthanide contractions due to poor shielding effect of ‘f’ orbitals which  reflect constant decrease in atomic size of lanthanides from left to right.
 

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