Question
The correct order of atomic/ionic radii is

Answer

a
$(a)\,\, (a)\, Sc > Ti > V > Cr$ (size decrease initially in $3d-$ series)
          $(b) $ Correct order : $Zn > Cu > CO \approx Ni$
          $(c)$ Correct order : $S^{2-} > Cl^{-} > N^{3-} > O^{2-}$

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