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Incorrect order of radius is :
(a) \( \mathrm{Sr}^{2+}\mathrm{Rb}^{+}\mathrm{Br}^{-}\mathrm{Se}^{2-} \)
(b) \( \mathrm{Nb}^{5+}\mathrm{Zr}^{4+}\mathrm{Y}^{3+} \)
\( \mathrm{P} \)
(c) \( \mathrm{Co}\mathrm{Co}^{2+}\mathrm{Co}^{3+}\mathrm{Co}^{4+} \)
(d) \( \mathrm{Ba}^{2+}\mathrm{Cs}^{+}\mathrm{As}^{3+} \)
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