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Need explanation for: Among LiH, NaH, KH, RbH, CsH, He correct order of increasing ionic character is

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)
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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

LiH< NaH< KH< RbH < CsH

 

 


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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