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The S-Block Elements

Question
CBSEENCH11007093
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How would you explain that the following observations?
LiI is more soluble than KI in ethanol?

Solution

As the size of Li+ ion is much smaller than K+ ion, therefore Li+ ion can polarise bigger I- ions to a greater extent than K+ ions (Fajan rule). As a result, LiI is more covalent than KI and hence is more soluble in ethanol. (organic solvent).

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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