AIPMT PRELIMS2009Chemistry-Chemical Kinetics
AIPMT PRELIMS 2009 Chemistry Rate of Reaction MCQ Question
Type: MCQ-numerical-Medium-Class 12
In the reaction BrO₃⁻ (aq) + 5 Br⁻ (aq) + 6H⁺ → 3 Br₂(l) + 3 H₂O(l): The rate of appearance of bromine (Br₂) is related to rate of disappearance of bromide ions as following:
A
d(Br₂)/dt = -5/3 d(Br⁻)/dt
B
d(Br₂)/dt = 5/3 d(Br⁻)/dt
C
d(Br₂)/dt = 3/5 d(Br⁻)/dt
D
d(Br₂)/dt = -3/5 d(Br⁻)/dt
Correct Answer
Option D
Detailed Explanation
The stoichiometry of the reaction shows that 5 moles of Br⁻ are consumed for every 3 moles of Br₂ produced. Therefore, the rate of appearance of Br₂ is (3/5) times the rate of disappearance of Br⁻.
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