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AIIMS2007ChemistrySolutions

(1 ~mol ) each of the following compounds is dissolved in (1 ~L ) of solution. Which will have the largest ( T_b ) value?

Options

  1. A( HF )
  2. B( HCl )
  3. C( HBr )
  4. D( HI )

Correct answer

D. ( HI )

Step-by-step solution

Bond dissociation energy increases in the order. ( HI < HBr < HCl < HF ) ( HF ) is most stable halogen acid and ( HI ) is the least. Higher the bond dissociation energy, lower is the degree of ionisation. As we know ( T_b=i K_b m ). Hence ( T_b ) value is largest in HI. All colligative properties depend on number of particles.

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