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NEST2021ChemistryChemical Bonding and Molecular Structure

In general, hard acids and hard bases are small in size and non-polarizable, whereas soft acids and soft bases are larger and more polarizable. Interaction between hardhard or soft-soft species is found to be stronger than that between a hard-soft species. The correct statement(s) is/are

Options

  1. ASince Cu ²⁺ forms [ Cu ( NH ₃ )₄ ]²⁺ more favourably than Cu ( OH )₂ , it shows that Cu ²⁺ acts as a soft acid
  2. BAg ⁺ is a soft acid and interacts more strongly with chloride than with iodide ion.
  3. CSoft metal ions tend to form sulfide ores and hard metal ions form oxide ores.
  4. DAssuming CO to be a soft base, its complex formation with Fe is favoured as compared to that with Fe ³⁺ .

Correct answer

D. Assuming CO to be a soft base, its complex formation with Fe is favoured as compared to that with Fe ³⁺ .

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