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

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An Intiative by Sri Chaitanya

Fe²⁺ and Fe³⁺

O and S

N and C

Cl^– and Cl

answer is B.

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Detailed Solution

We know that as atomic size decreases as we move along the period from left to right and increases as we go down the group .

Now, Oxygen and sulphur belong to the same group 16, and atomic size increases as we move down the group that is why oxygen(O) has less size than sulphur (S).

Therefore, option(b) is the answer.

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