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Q.

For which pair of species are the radii most similar?

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a

$Li$ and $Na$

b

$Na$ and $Mg$

c

$Mn$ and $Fe$

d

${Fe}^{2 +}$ and ${Fe}^{3 +}$

answer is C.

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Detailed Solution

Mn and Fe are both transition metals in the same phase where there is little variation in atomic radii. This is because the additional 3d electron screening balances off the growing pull of the extra protons coming from Mn and Fe on the outer 4s electrons.

Thus, the option C is correct.

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