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- Need explanation for: Among LiH, NaH, KH, RbH, CsH, He correct order of increasing ionic character is
- #Chemistry
- #Engineering
- #Birla Institute of Technology & Science Admission Test
- #Hydrogen and s-block Elements
Among LiH, NaH, KH, RbH, CsH, He correct order of increasing ionic character is
- Option 1)
LiH < NaH < CsH < KH < RbH
- Option 2)
LiH < NaH < KH < RbH < CsH
- Option 3)
RbH < CsH < NaH < KH < LiH
- Option 4)
NaH < CsH < RbH < LiH < KH
Answers (1)
As we learnt in
Ionic Hydride -
These are compounds of hydrogen with S block elements
- wherein
e.g.
LiH
BeH2
MgH2
The is smaller the size of the Cation, the greater is the charge density and higher will be the polarizing power. High polarizing power will raise the covalent character of the molecules.
As we go down the group polarizing power drops
Therefore, Increasing Ionic Character
Option 1)
LiH < NaH < CsH < KH < RbH
This option is incorrect.
Option 2)
LiH < NaH < KH < RbH < CsH
This option is correct.
Option 3)
RbH < CsH < NaH < KH < LiH
This option is incorrect.
Option 4)
NaH < CsH < RbH < LiH < KH
This option is incorrect.
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