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 From the rate equation for the reaction given below, determine the order with respect to the overall reaction:

\text { (i) } 2 \mathrm{HCrO}_4^{-}+6 \mathrm{I}^{-}+14 \mathrm{H}^{+} \rightarrow 2 \mathrm{Cr}^{3+}+3 \mathrm{I}_2+8 \mathrm{H}_2 \mathrm{O}

\text { Rate } \propto\left[\mathrm{HCrO}_4^{-}\right]\left[\mathrm{I}^{-}\right]^2\left[\mathrm{H}^{+}\right]^2

Option: 1

5


Option: 2

22


Option: 3

4


Option: 4

9


Answers (1)

best_answer

Order of a reaction:
For a given reaction:
\mathrm{a A+b B+c C \rightarrow}  Products
If,
Rate \mathrm{\propto[A]^p[B]^q[C]^r} Overall order of the reaction is :

(p+q+r)
So, for

\mathrm{2 \mathrm{HCrO}_4^{-}+6 \mathrm{I}^{-}+14 \mathrm{H}^{+} \rightarrow 2 \mathrm{Cr}^{3+}+3 \mathrm{I}_2+8 \mathrm{H}_2 \mathrm{O}}
Given,
Rate  \mathrm{\propto\left[\mathrm{HCrO}_4^{-}\right]\left[\mathrm{I}^{-}\right]^2\left[\mathrm{H}^{+}\right]^2}
Overall order \mathrm{=1+2+2=5}

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Pankaj

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