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The S-Block Elements

Question
CBSEENCH11007085
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Comment on each of the following observations:
 The mobilities of the alkali metal ions in aqueous solution are Li+ < Na+ < K+ < Rb+ < Cs+

Solution
We know that smaller the size of the ion, more highly it is hydrated and thus greater is the mass of the hydrated ion and hence smaller is the ionic mobility. Since the extent of hydration of the ion decreases in the order
Li+ > Na+ > K+ > Rb+ > Cs+ therefore, ionic mobility increases in the order Li+ < Na+ < K+ < Rb+ < Cs+.

Some More Questions From The s-Block Elements Chapter

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?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

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