Banking Chemistry Environmental Chemistry Question Bank Environmental Pollution

  • question_answer Identify the incorrect statement from the following.

    A)  Ozone absorbs the intense ultraviolet radiation of the sun.

    B)  Depletion of ozone layer is because of its chemical reactions with chlorofluoro alkanes.

    C)  Ozone absorbs infrared radiation.  

    D)  Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer.

    Correct Answer: C

    Solution :

     The ozone layer, existing-between 20 to 35 km above the earth?s surface, shield the earth from the harmful U. V. radiations from the sun. Depletion of ozone is caused by oxides of nitrogen \[\begin{align}   & {{N}_{2}}O+hu\to NO+N \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,reactive\,nitric\,oxide \\ \end{align}\] \[NO+{{O}_{3}}\to N{{O}_{2}}+{{O}_{2}}\] \[{{O}_{3}}+hu\to {{O}_{2}}+O\] \[N{{O}_{2}}+O\to NO+{{O}_{2}}\] \[2{{O}_{3}}+hu\to 3{{O}_{2}}\] (Net reaction) The presence of oxides of nitrogen increase the decomposition of \[{{O}_{3}}\].

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