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AIPMT MAINS2009Chemistry-Chemical Kinetics

AIPMT MAINS 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=−53d(Br−)dt\frac{d(Br_2)}{dt} = -\frac{5}{3}\frac{d(Br^-)}{dt}

B

d(Br2)dt=53d(Br−)dt\frac{d(Br_2)}{dt} = \frac{5}{3}\frac{d(Br^-)}{dt}

C

d(Br2)dt=35d(Br−)dt\frac{d(Br_2)}{dt} = \frac{3}{5}\frac{d(Br^-)}{dt}

D

d(Br2)dt=−35d(Br−)dt\frac{d(Br_2)}{dt} = -\frac{3}{5}\frac{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−5s^{-5}/3 times the rate of disappearance of Br⁻.

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