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The S-Block Elements

Question
CBSEENCH11008383
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In the case of alkali metals, the covalent character decreases in the order

  • MCl> MI>MBr>MF

  • MF> MCl> MBr>MI

  • MF > MCl> MI>MBr

  • MI>MBr>MCl>MF

Solution

D.

MI>MBr>MCl>MF

According to Fajan's rule
Covalent space character space proportional to fraction numerator 1 over denominator Size space of space cation end fraction proportional to space size space of space anion
In the given options, the cation is same but anions are different. Among halogens the order of size is 
F < Cl< Br< I
therefore, Order of covalent character is 
MI> MBr>MCl>MF

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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