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The s-Block Elements
Question
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The correct order of the mobility of the alkali metal ions in aqueous solution is:

  • Li+>Na+ > K+ > Rb+

  • Na+>K+ > Rb+  > Li+

  • K+ > Rb+ >Na+ > Li+

  • Rb+ > K+ > Na+ > Li+

Answer

D.

Rb+ > K+ > Na+ > Li+

The correct order of the mobility of the alkali metal ions in aqueous solutions 
Rb+ > K+ > Na+ > Li+ due to following order of hydration energy of these ions Li+ > Na+ > K+ > Rb+ and due to hydration of ion, mobility decreases.

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Some More Questions From The s-Block Elements Chapter

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?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?