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The S-Block Elements

Question
CBSEENCH11007083
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Why ionic conductance of alkali metal ions in aqueous solution are in the order:
Li+ < Mg + < K+ < Rb+ < Cs+ Explain ?

Solution
Smaller the ion, greater is the degree of hydration and hence lesser is the ionic mobility. Since Li+ ion has the maximum degree of hydration so it has lowest ionic mobility. Since the degree of hydration decreases from Li+ to Cs+, therefore, ionic conductance increases from Li+ to Cs+.

Some More Questions From The s-Block Elements Chapter

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?

Why alkali metals are normally kept in kerosene oil?

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