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The S-Block Elements

Question
CBSEENCH11007075
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Explain why alkali metals are electrically conducting and form soluble salts ?

Solution

Alkali metals have metallic bonds in which the positive ions are held together by electrons. The valence electrons move freely from one metal ion to another without much difficulty and thus have high electrical conductivity. Solubility depends on lattice enthalpy and hydration enthalpy. Since the alkali metal ions have low lattice enthalpy and high hydration energy so they form soluble salts.

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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