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NTA Abhyas NEET2020ChemistryChemical Bonding and Molecular StructurePractice

Which of following represents the correct order of covalent character among the iodides of alkali metals?

Options

  1. ALiI > NaI > KI > RbI > CsI
  2. BNaI > KI > RbI > CaI > LiI
  3. CLiI > CsI > RbI > KI > NaI
  4. DCsI > RbI > KI > NaI > LiI

Correct answer

A. LiI > NaI > KI > RbI > CsI

Step-by-step solution

Extent of polarization decreases with increasing in size of cation. Extent of polarization is maximum in LiI and minimum in CsI. Hence, LiI has maximum covalent character while CsI has minimum covalent character. LiI > NaI > KI > RbI > CsI

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