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Question

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

A
Fe2+, Fe3+
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B
O, S
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C
N, O
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D
Cl, Cl
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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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