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The s-Block Elements
Question
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Which of the following is the correct order of stability for the given superoxides?

  • KO2 < RbO2 < CsO2

  • CsO2 < RbO2<KO2

  • RbO2

  • KO2 < CsO2 <RbO2

Answer

A.

KO2 < RbO2 < CsO2

With a 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

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Some More Questions From The s-Block Elements Chapter

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

What is the nature of lithium compounds?

Group 1 elements are called alkali metals. Why?

Why caesium can be used in photoelectric cell while lithium can not be?

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason. 

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?