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Q.

Incorrect order of radius is :

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a

Sr2+

b

Nb5+

c

Co>Co2+>Co3+>Co4+

d

Ba2+

answer is D.

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Detailed Solution

In (a) and (b) use (z / e) concept for isoelectronic specie.In (c) size of neutral atom is greater than its cation.In (d) As3+ cation is smaller than Cs+ and Ba2+ cations.
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