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NEET2009ChemistryChemical KineticsActual

In the reaction, ( BrO ₃⁻ )(aq.) (+5 Br ⁻ )(aq.) (+6 H ⁺ )(aq.) ( 3 Br ₂( l )+3 H ₂ O ) (l) .The rate of appearance of bromine ( Br ₂ ) is related to rate of disappearance of bromide ions as following

Options

  1. Ad [ Br ₂ ] dt =- 3 5 d [ Br ⁻ ] dt
  2. Bd [ Br ₂ ] dt =- 5 3 d [ Br ⁻ ] dt
  3. Cd [ Br ₂ ] dt = 5 3 d [ Br ⁻ ] dt
  4. Dd [ Br ₂ ] dt = 3 5 d [ Br ⁻ ] dt

Correct answer

A. d [ Br ₂ ] dt =- 3 5 d [ Br ⁻ ] dt

Step-by-step solution

Key Idea Rate of appearance/disappearance = 1 array l stoichiometric coefficient array [reactant or product] time taken For reaction, aligned BrO ₃⁻( aq )+5 Br ⁻( aq )+6 H ⁺ & 3 Br ₂(1) & +3 H ₂ O ( l ) aligned Rate of appearance of bromine ( Br ₂ ) =+ 1 3 d [ Br ₂ ] dt Rate of disappearance of bromide ion ( Br ⁻ ) =- 1 5 d [ Br ⁻ ] dt or d [ Br ₂ ] dt =- 3 5 d [ Br ⁻ ] dt

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