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  • For an elementary reaction <img alt="2 \mathrm{A} \rightleftharpoons \mathrm{B}" src="http://entrancecorner.oncodecogs.com/gif.latex?2%20%5Cmathrm%7BA%7D%20%5Crightleftharpoons%20%5Cmat

For an elementary reaction
2 \mathrm{A} \rightleftharpoons \mathrm{B}, the rate of disappearance of A is equal to:
(k1 and k2 are rate constants of forward and backward reactions, respectively)
 

Option: 1

\frac{2 k_{1}}{k_{2}}[\mathrm{A}]^{2}


Option: 2

-2 k_{1}[\mathrm{A}]^{2}+2 k_{2}[\mathrm{B}]


Option: 3

2 k_{1}[\mathrm{A}]^{2}-2 k_{2}[\mathrm{B}]


Option: 4

\left(2 k_{1}-k_{2}\right)[\mathrm{A}]


Answers (1)

best_answer

\begin{array}{l}{\text { Rate of reaction }=-\frac{1}{2} \frac{d[\mathrm{A}]}{d t}=k_{1}[\mathrm{A}]^{2}-k_{2}[\mathrm{B}]} \\\\ {\therefore \text { Rate of disappearance of } \mathrm{A}} \\\\ {=\frac{-d[\mathrm{A}]}{d t}=2 k_{1}[\mathrm{A}]^{2}-2 k_{2}[\mathrm{B}]}\end{array}

Therefore, option(3) is correct

Posted by

Pankaj

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