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JIPMER 2017
Exam
JIPMER
Year
2017
Subject
Chemistry
Chapter
s Block Elements

JIPMER 2017 · Chemistry · s Block Elements

Which of the following is the correct order of stability for the...

Which of the following is the correct order of stability for the given superoxides?

Options

  1. AKO2<RbO2<CsO2\mathrm{KO}_2 \lt \mathrm{RbO}_2 \lt \mathrm{CsO}_2
  2. BCsO2<RbO2<KO2\mathrm{CsO}_2 \lt \mathrm{RbO}_2 \lt \mathrm{KO}_2
  3. CRbO2<CsO2<KO2\mathrm{RbO}_2 \lt \mathrm{CsO}_2 \lt \mathrm{KO}_2
  4. DKO2<CsO2<RbO2\mathrm{KO}_2 \lt \mathrm{CsO}_2 \lt \mathrm{RbO}_2

Correct answer

A. KO2<RbO2<CsO2\mathrm{KO}_2 \lt \mathrm{RbO}_2 \lt \mathrm{CsO}_2

Step-by-step solution

With progressive increase in the size of alkali metal ions, the stability of superoxides increases because the size of superoxide ion is large and large cation can be stabilised more by large anion. Therefore, the order of stability is KO2<RbO2<CsO2\mathrm{KO}_2 \lt \mathrm{RbO}_2 \lt \mathrm{CsO}_2
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