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Q.

. Arrange   (I) Ce3+, (II) La3+ (III) Pm3+  and (IV) Yb2 in increasing order of their ionic radii

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a

IV

b

I

c

IV

d

III

answer is A.

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Detailed Solution

Ionic radii decrease across lanthanide series due to lanthanide contraction. As all ions are in +3 O.S., ionic radii will follow the trend of atomic radii.  ∴ La3+ >  Ce3+ > Pm3+ >  Yb3+  (Z=57) (Z=58) (Z=61) (Z=70)
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. Arrange   (I) Ce3+, (II) La3+ (III) Pm3+  and (IV) Yb2 in increasing order of their ionic radii