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AP EAMCET2008Chemistryp Block Elements (Group 15, 16, 17 & 18)

Which one of the following reactions does not occur?

Options

  1. AF ₂+2 Cl ⁻ 2 ~F ⁻+ Cl ₂
  2. BCl ₂+2 ~F ⁻ 2 Cl ⁻+ F ₂
  3. CBr ₂+2 I ⁻ 2 Br ⁻+ I ₂
  4. DCl ₂+2 Br ⁻ 2 Cl ⁻+ Br ₂

Correct answer

B. Cl ₂+2 ~F ⁻ 2 Cl ⁻+ F ₂

Step-by-step solution

With progressive increase in atomic number, the reduction potential of halogens decreases, thus oxidising power also decreases. Hence, a halogen with lower atomic number will oxidise the halide ion of higher atomic number and therefore, will liberate them from their salt solution. Hence, the reaction Cl ₂+2 ~F ⁻ 2 Cl ⁻+ F ₂ is not possible.

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