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The S-Block Elements

Question
CBSEENCH11007153
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Give any three points of similarities between beryllium and aluminium and two points of dissimilarities between beryllium and barium ?

Solution

Points of similarities:
(i) BeO as well as Al2O3 are high melting solids.
(ii) Anhydrous chlorides of Be as well as Al are covalent, soluble inorganic solvent and act as Lewis acids.
(iii) Both Be and Al form fluoro-complex anions BeF subscript 4 superscript minus and AlF subscript 4 superscript minus in solution.
Points of dissimilarities:
(i) Beryllium does not impart any colour to bunsen flame owing to its small atomic and ionic size in which electrons are held more tightly ; on the other hand, barium imparts apple green colour to the bunsen flame.
(ii) Beryllium is least and barium is most reactive in the group. 

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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