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The S-Block Elements

Question
CBSEENCH11007154
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How beryllium chloride is prepared? Give its two important properties

Solution

Preparation. It is prepared by heating beryllium oxide and carbon mixture in an atmosphere of chlorine. 
BeO space plus space straight C space plus space Cl subscript 2 space rightwards arrow with 870 minus 1070 space straight K on top space BeCl subscript 2 space plus space CO
Properties:
1. It is covalent in nature and fumes strongly in the moist air due to hydrolysis. 
BeCl subscript 2 space plus space 2 straight H subscript 2 straight O space rightwards arrow space space Be left parenthesis OH right parenthesis subscript 2 space plus space 2 HCl
2. In the vapour phase, it exists as a dimer which dissociates into monomers at about 1200 K.
stack left parenthesis BeCl subscript 2 right parenthesis subscript 2 with Dimer below space rightwards arrow with 1200 space straight K on top space stack 2 BeCl subscript 2 with Monomer below

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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