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Q.

Which of the following is arranged in decreasing order of size?

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a

Mg2+>Al3+>O2−

b

O2−>Mg2+>Al3+

c

Al3+>Mg2+>O2−

d

Al3+>O2−>Mg2+

answer is B.

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Detailed Solution

Al3+,Mg2+ and O2− are isoelectronic species.→ As pe↑; size decreases. (p=protons, e=electrons)Ionic radius order : O2−>Mg2+>Al3+
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Which of the following is arranged in decreasing order of size?