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The S-Block Elements

Question
CBSEENCH11007004
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Which of the following alkali metal is having least melting point?
(i) Na   (ii) K     (iii) Rb      (iv) Cs

Solution
Cesium (Cs), This is because as the size of the metal increases, the strength of metallic bonding decreases and hence its meling point decreases. Since the size of Cs is the biggest, therefore its melting point is the lowest.

Some More Questions From The s-Block Elements Chapter

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?

Why lithium cannot be stored in kerosene?

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