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COMEDK2024ChemistryChemical Bonding and Molecular StructureActual

From the following pair of compounds, identify the incorrect pair in terms of the covalent character.

Options

  1. ABeCl ₂> MgCl ₂
  2. BA g C l>A g I
  3. CCuS > CuO
  4. DSnCl ₄> SnCl ₂

Correct answer

B. A g C l>A g I

Step-by-step solution

According to Fajan's rule, covalent character increases with smaller cation size, higher cation charge, and higher polarizability of the anion. For option (KjFWQ), Be ²⁺ is smaller than Mg ²⁺ , so BeCl ₂ has more covalent character than MgCl ₂ . This is correct. For option (U7Fpy), the cation Ag ⁺ is the same. The anion I ⁻ is larger and more polarizable than Cl ⁻ . Therefore, AgI should have more covalent character than AgCl . The statement AgCl > AgI is incorrect. For option (AHM95), S ²⁻ is more polarizable than

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