COMEDK2024ChemistryChemical KineticsActual
The rate of appearance of bromine is related to the disappearance of bromide ion in the equation given below is: BrO ₃⁻ (aq) +5 Br ⁻ (aq) +6 H ⁺ 3 Br ₂( l )+3 H ₂ O ( l )
Options
- Ad [ Br ₂ ] dt =- 1 5 d [ Br ⁻ ] dt
- Bd [ Br ₂ ] dt =- 3 5 d [ Br ⁻ ] dt
- Cd [ Br ₂ ] dt = 5 3 d [ Br ⁻ ] dt
- Dd [ Br ₂ ] dt = 3 5 d [ Br ⁻ ] dt
Correct answer
B. d [ Br ₂ ] dt =- 3 5 d [ Br ⁻ ] dt
Step-by-step solution
For the given chemical reaction BrO ₃⁻ + 5 Br ⁻ + 6 H ⁺ 3 Br ₂ + 3 H ₂ O , the rate of reaction r is expressed in terms of the rate of change of concentration of reactants and products as follows: r = - d[ BrO ₃⁻] dt = - 1 5 d[ Br ⁻] dt = - 1 6 d[ H ⁺] dt = 1 3 d[ Br ₂] dt = 1 3 d[ H ₂ O ] dt We are interested in the relationship between the rate of appearance of bromine, d[ Br ₂] dt , and the rate of disappearance of bromide ion, - d[ Br ⁻] dt . From the rate expression, we have: - 1 5 d[ Br ⁻] dt = 1 3 d[ Br ₂] d