Q.

Write the number of pairs in which size of first element or ion is higher as compared to second out of following nine pairs.(O,S),(He,Ne),(Kr,Ne),Na,Na+,Cl,Cl−,I−,Cl−,LiAq+,NaAq+,(Li,Na),Li+,Na+

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answer is 4.

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Detailed Solution

(Kr,Ne),Na,Na+,I−,Cl−,LiAq+,NaAq.+
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Write the number of pairs in which size of first element or ion is higher as compared to second out of following nine pairs.(O,S),(He,Ne),(Kr,Ne),Na,Na+,Cl,Cl−,I−,Cl−,LiAq+,NaAq+,(Li,Na),Li+,Na+