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NEET 2009
Exam
NEET
Year
2009
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2009 · Chemistry · Chemical Kinetics

In the reaction BrO_3^ - ( aq )+5 Br^ - ( aq )+6 H^ + arrow 3...

In the reaction BrO3−\mathrm{BrO}_3^{-}(aq\mathrm{aq})+5 Br−\mathrm{Br}^{-}(aq\mathrm{aq})+6 H+\mathrm{H}^{+} \rightarrow 3 Br2(l)+3H2O\mathrm{Br}_2(l)+3 \mathrm{H}_2 \mathrm{O}(l) The rate of appearance of bromine (Br2)\left(\mathrm{Br}_2\right) is related to rate of disappearance of bromide ions as following

Options

  1. A\frac{\mathrm{d}\left(\mathrm{\text{ Br }}_2\right)}{\mathrm{dt}}=\frac{3}{5} \frac{\mathrm{d}\left(\mathrm{Br}^{-}\right)}{\mathrm{dt}}
  2. B\frac{\mathrm{d}\left(\mathrm{\text{ Br }}_2\right)}{\mathrm{dt}}=-\frac{3}{5} \frac{\mathrm{d}\left(\mathrm{Br}^{-}\right)}{\mathrm{dt}}
  3. C\frac{\mathrm{d}\left(\mathrm{\text{ Br }}_2\right)}{\mathrm{dt}}=-\frac{5}{3} \frac{\mathrm{d}\left(\mathrm{Br}^{-}\right)}{\mathrm{dt}}
  4. D\frac{\mathrm{d}\left(\mathrm{\text{ Br }}_2\right)}{\mathrm{dt}}=\frac{5}{3} \frac{\mathrm{d}\left(\mathrm{Br}^{-}\right)}{\mathrm{dt}}

Correct answer

B. \frac{\mathrm{d}\left(\mathrm{\text{ Br }}_2\right)}{\mathrm{dt}}=-\frac{3}{5} \frac{\mathrm{d}\left(\mathrm{Br}^{-}\right)}{\mathrm{dt}}

Step-by-step solution

−14d(Br−)dt=−13d(Br2)dtd(Br2)dt=−35d(Br−)dt\begin{aligned}& -\frac{1}{4} \frac{\mathrm{d}\left(\mathrm{Br}^{-}\right)}{\mathrm{dt}}=-\frac{1}{3} \frac{\mathrm{d}\left(\mathrm{Br}_2\right)}{\mathrm{dt}}\\ & \frac{\mathrm{d}\left(\mathrm{Br}_2\right)}{\mathrm{dt}}=-\frac{3}{5} \frac{\mathrm{d}\left(\mathrm{Br}^{-}\right)}{\mathrm{dt}} \end{aligned}
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