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Question

Which of the following statement(s) is/are correct?


Correct Answer
A
The hybrid state of Be in BeCl2 in solid state is sp3
Correct Answer
B
The hybrid state of Be in BeCl2 in vapour state is sp
Correct Answer
C
BeH2 is a covalent and polymeric compound
Your Answer
D
The ionic character of group II halides follows the order:
BeX2>MgX2>CaX2>SrX2 

Solution

The correct options are
A The hybrid state of Be in BeCl2 in solid state is sp3
B The hybrid state of Be in BeCl2 in vapour state is sp
C BeH2 is a covalent and polymeric compound
a) In solid state, BeCl2 exists as a polymer and each Be is bonded to four Cl atoms . Thus Be is sp3 hybridised here.  
b) In vapour state, BeCl2 exists as a linear molecule (monomer) and hence, Be is sp hybridised. 
c) BeH2 is a covalent and polymeric compound because of electron defficiency.
d) The ionic character of group II halides follows the reverse order that is given in the option, since according to Fajan's rule polarising ability decreases down the group so covalent character decreases down the group.   

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