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The S-Block Elements

Question
CBSEENCH11007095
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How will you explain the reactivity of alkali metals with halogens ?

Solution

Alkali metals combine with halogens to form metal halides, which are ionic crystalline solids having general formula M+X–.
2 straight M plus straight X subscript 2 space rightwards arrow space 2 straight M to the power of plus straight X to the power of minus
Reactivity of alkali metals with particular halogen increases from Li to Cs. On the other hand, the reactivity of halogens with particular alkali metal M decreases from F2 to I2.

All the halides of alkali metals except lithium fluoride are freely soluble in water. The low solubility of lithium fluoride is attributed to the greater force of attraction between lithium ions and fluoride ions in the crystal lattice.

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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