In which of the following pairs, the first atom or ion is not larger than the second?

F e^{2 +}, F e^{3 +}

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O, S

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N, O

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C l^{-}, C l

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Solution

The correct option is B $O, S$
On going down the group size increases. On going from left to right in a period size decreases. More the positive charge on a atom less the size as size decreases with increase in effective nuclear charge. Similarly, size of anion > neutral atom.

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