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JEE Main202324 Jan 2023Morning ShiftChemistryChemical Bonding and Molecular StructureActual

Order of Covalent bond; A. KF > KI ; LiF > KF B. KF < KI ; LiF > KF C. SnCl 4 > SnCl 2 ; CuCl > NaCl D. LiF > KF ; CuCl > NaCl E. KF < KI ; CuCl > NaCl

Options

  1. AC, E Only
  2. BB, C Only
  3. CB, C, E Only
  4. DA, B Only

Correct answer

C. B, C, E Only

Step-by-step solution

According to Fajan's Rule, small cation has more polarising power and larger anion has more polarisability. These small cations and larger anions favours covalent character. A. KF > KI - False (Iodide is larger anion than fluoride) LiF > KF - True (Lithium-ion is smaller cation than potassium ion) B. KF < KI - True; LiF > KF - True C. SnCl 4     > SnCl 2 - True( Sn 4 + is smaller than Sn 2 + ); The ions with pseudo inert gas configuration prefers the covalent character. CuCl >

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