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Solution


Q.

Reason of lanthanoid contraction is              [2014]
1 negligible screening effect of 'f'-orbitals  
2 increasing nuclear charge  
3 decreasing nuclear charge  
4 decreasing screening effect  

Ans.

(1)

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.