Elementary Reactions and Intermediates

 

 1) Which of the following reactions could be elementary and unimolecular reactions?

     (a) O3(g) O2(g) + O(g)

     (b) Br2(g) 2Br(g)

     (c) O3(g) + O(g) 2O2(g)

     (d) 2NO(g) + 2H2(g) N2(g) + 2H2O(g)

 

 2) Suppose that for the reaction of nitrogen dioxide and carbon monoxide

NO2(g) + CO(g) NO(g) + CO2(g)

the following mechanism has been proposed at high temperatures

NO2 + CO O-N-O-C-O (slow)

O-N-O-C-O NO + CO2 (fast)

Which of the following is an intermediate in this mechanism?

     (a) NO2

     (b) O-N-O-C-O

     (c) NO

     (d) CO

  

 3) Which of the following reactions could be elementary and unimolecular reactions?

     (a) H(g) + Br2(g) HBr(g) + Br(g)

     (b) (CH3)3CBr(g) (CH3)3C+(g) + Br-(g)

     (c) 2H2(g) + O2(g) 2H2O(g)

     (d) I2(g) 2I(g)

 

  4) Suppose that for the reaction of nitrogen dioxide and carbon monoxide

NO2(g) + CO(g) NO(g) + CO2(g)

the following mechanism has been proposed at high temperatures

NO2 + NO2 NO3 + NO (slow)

NO3 + CO NO2 + CO2 (fast)

Which of the following is an intermediate in this mechanism?

     (a) NO2

     (b) NO

     (c) NO3

     (d) CO2

 

 5) Which of the following reactions could be elementary and bimolecular reactions?

     (a) 2O3(g) 3O2(g)

     (b) N2O4(g) 2NO2(g)

     (c) NO(g) + O3(g) NO2(g) + O2(g)

     (d) 2NO(g) + O2(g) 2NO2(g)

 

 6) Which of the following reactions could not be elementary reactions?

     (a) 2SO2(g) + O2(g) 2SO3(g)

     (b) FClO2(g) FClO(g) + O(g)

     (c) 2NO2(g) NO(g) + NO3(g)

     (d) 2ICl(g) + H2(g) I2(g) + 2HCl(g)

 

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