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Q.

Identify the correct order of increasing ionic sizes

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a

Al3+<F<O2<Cl

b

F<O2<Cl<Al3+

c

Al3+<F<Cl<O2

d

Al3+<O2<F<Cl

answer is C.

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Detailed Solution

The electronic configurations of the given ions are

Al3+:(1s)2(2s)2(2p)6 F:(1s)2(2s)2(2p)6

O2:(1s)2(2s)2(2p)6 Cl: (1s)2(2s)2(2p)6(3s)2(3p)6

The size of Cl- will be the largest as its outer shell belongs to the quantum number n = 3. Of the remaining species,

Al3+ will have the minimum ionic size because of three positive charge and O2-will have maximum ionic size because of two negative charge.

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