Chlorofluorocarbons (CFC) act as catalysts for the destructionof ozone in the up

Question

Chlorofluorocarbons (CFC) act as catalysts for the destructionof ozone in the uper atmosphere. Ultra violet light from the sunbreaks carbon-chlorine bonds in CFC's.

CF2Cl2 CF2Cl + Cl

The Cl atom reacts with ozone.

Cl + O3 ClO + O2
ClO + O Cl + O2

The direct reaction is

O3 + O 2 O2

Which of the following are true about thesereactions ? More than onecan be correct

a) The direct reaction breaks down O3 at a fasterrate than the same reaction where Cl is used as a catalyst.

b) While Cl can be used as a catalyst, it will not appear as anintermediate in the resulting two-step mechanism since it isregenerated in the last step.

c) The presence of Cl provides a mechanism with lowerEa 's than the direct reaction (in the absence ofCl)

d) E (reaction energy) is the same whether Cl is presentas a catalyst or not

Explanation / Answer

   a is not true because chemical reactionsare faster when catalyst is used        b is not true , here Cl is anintermediate    c   is true , catalyst providesan alternative path having lower activation energy    d is true    e is true , since the reactants &prodicts are in gas phase

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