Chemical Kinetics · JEE Main previous year questions

2006 3 questions

1. Q1202006 · 29 Apr 2006 · Shift 1

   A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will

   1. A.remain unchanged
   2. B.triple
   3. C.increase by a factor of 4
   4. D.double
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   Answer: C

2. Q1212006 · 29 Apr 2006 · Shift 1

   Rate of a reaction can be expressed by Arrhenius equation as: $$k=A{e}^{-E/RT}$$ In this equation, E represents

   1. A.the energy above which all the colliding molecules will react
   2. B.the energy below which colliding molecules will not react
   3. C.the total energy of the reacting molecules at a temperature, T
   4. D.the fraction of molecules with energy greater than the activation energy of the reaction
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   Answer: B

3. Q1232006 · 29 Apr 2006 · Shift 1

   The following mechanism has been proposed for the reaction of NO with $\mathrm{B}{\mathrm{r}}_2$ to form NOBr: $\mathrm{NO}(\mathrm{g})+\mathrm{B}{\mathrm{r}}_2(\mathrm{g})\rightleftharpoons \mathrm{NOB}{\mathrm{r}}_2(\mathrm{g})$ $\mathrm{NOB}{\mathrm{r}}_2(\mathrm{g})+\mathrm{NO}(\mathrm{g})\to 2NOBr(\mathrm{g})$ If the second step is the rate determining step, the order of the reaction with respect to NO(g) is

   1. A.1
   2. B.0
   3. C.3
   4. D.2
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   Answer: D