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Q.

Which of the following species have incorrect order of size?

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a

O2−>O->F⊖>F

b

O⊖>O2−>F⊖>F

c

O2−>F⊖>O⊖>F

d

O2−>F⊖>F>O⊖

answer is B.

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Detailed Solution

They are not isoelectronic species. Size of O > size of F, along the 2nd period (→) size decreases. Size of more negatively charged ion is greater than less negatively charged ion and size of neutral atom is greater than positively charged ion. Hence the order isO2−>O⊖>F⊖>F
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Which of the following species have incorrect order of size?