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AP EAMCET202022 Sep 2020Morning ShiftChemistryChemical Bonding and Molecular StructureActual

The correct order of increasing ionic character among LiH , NaH , KH , RbH , CsH is

Options

  1. ALiH < NaH < CsH < KH < RibH
  2. BLiH < NaH < KH < RibH < CsH
  3. CPbH < CsH < NaH < KH < LiH
  4. DNaH < CsH < Rb - H < LiH < KH

Correct answer

B. LiH < NaH < KH < RibH < CsH

Step-by-step solution

According to Fajan's rule, the size of the cations increase down a group and also, the increase in size of an atom increases the ionic molecules formed. Caesium being lowest down the group has most ionic character, followed by rubidium, potassium, sodium and lithium respectively. LiH < NaH < KH < RbH < CsH . Hence, the correct option is (2).

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