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NEET2002ChemistryElectrochemistryActual

Which reaction is not feasible?

Options

  1. A2 KI + Br ₂ 2 KBr + I ₂
  2. B2 KBr + I ₂ 2 KI + Br ₂
  3. C2 KBr + Cl ₂ 2 KCl + Br ₂
  4. D2 H ₂ O +2 ~F ₂ 4 HF + O ₂

Correct answer

B. 2 KBr + I ₂ 2 KI + Br ₂

Step-by-step solution

2 KBr + I ₂ 2 KI + Br ₂ reaction is not possible because Br ⁻ ion is not oxidised in Br ₂ with I ₂ due to higher electrode (oxidation) potential of I ₂ than bromine. Energetically favorable means no energy input needed for reaction to take place.

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