Chemical Kinetics · JEE Main previous year questions

2002 4 questions

1. Q1822002 · 27 Apr 2002 · Shift 1

   Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively

   1. A.$\mathrm{se}{\mathrm{c}}^{-1},\mathrm{Mse}{\mathrm{c}}^{-1}$
   2. B.$\mathrm{se}{\mathrm{c}}^{-1},\mathrm{M}$
   3. C.$\mathrm{Mse}{\mathrm{c}}^{-1},\mathrm{se}{\mathrm{c}}^{-1}$
   4. D.$\mathrm{M},\mathrm{se}{\mathrm{c}}^{-1}$
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   Answer: A

2. Q1832002 · 27 Apr 2002 · Shift 1

   For the reaction $\mathrm{A}+2B\to \mathrm{C}$, rate is given by R = [A] [B]${}^2$ then the order of the reaction is

   1. A.3
   2. B.6
   3. C.5
   4. D.7
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   Answer: A

3. Q1842002 · 27 Apr 2002 · Shift 1

   The differential rate law for the reaction ${\mathrm{H}}_2+{\mathrm{I}}_2\to 2HI$ is

   1. A.$-\frac{d[H_2]}{dt}=-\frac{d[I_2]}{dt}=-\frac{d[HI]}{dt}$
   2. B.$\frac{d[H_2]}{dt}=\frac{d[I_2]}{dt}=\frac{d[HI]}{dt}$
   3. C.$\frac{1}{2}\frac{d[H_2]}{dt}=\frac{1}{2}\frac{d[I_2]}{dt}=-\frac{d[HI]}{dt}$
   4. D.$-2\frac{d[H_2]}{dt}=-2\frac{d[I_2]}{dt}=\frac{d[HI]}{dt}$
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   Answer: D

4. Q1852002 · 27 Apr 2002 · Shift 1

   If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is

   1. A.16 grams
   2. B.2 grams
   3. C.32 grams
   4. D.8 grams
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   Answer: D