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Environmental Chemistry Test - 28

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Environmental Chemistry Test - 28
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  • Question 1
    1 / -0
    The extent of darkness caused due to smog can be determined by the help of
    Solution
    Ringelmann's smoke charts show shades of grey by which the density of smoke can be compared. The darkness of a smoke depends upon the concentration and size of the particulate matter in the effluent. Thus the correct answer is option C.
  • Question 2
    1 / -0
    The term smog was coined by
    Solution
    Smog is the term which is used to describe the combination of the smoke and the fog. Dr. Henry Des Voeux coined the term smog after he studied the fog in London which contains the smoke and dust particles. The presence of the high concentration of the carbon particles, the smog was known as black fog. 
    Thus, the correct answer is option A. 
  • Question 3
    1 / -0
    Which of the following chemical is released by chlorofluorocarbon that is harmful to ozone ?
    Solution
    Chlorofluorocarbons are the compounds which are used as coolants in the air conditioning systems, refrigerators, coolers, etc. The CFCs, when released into the atmosphere, react with UV rays to form chlorine atoms which destroy the ozone layer and results in the thinning out of the ozone layer also known as the ozone hole.
    Thus, the correct answer is option D. 
  • Question 4
    1 / -0
    Air pollution causing photochemical oxidants production includes
    Solution
    Pollution is defined as addition of harmful components in the environment which alters the composition of an environment and that harmful component is known as pollutant. The reaction of solar radiation with primary airborne pollutants like nitrogen oxides and volatile organic compounds forms photochemical smog. Ultraviolet light can split nitrogen dioxide into nitric oxide and monatomic oxygen and this monatomic oxygen can then react with oxygen gas to form ozone. Products like ozone, aldehydes, and peroxyacetyl nitrates are called secondary pollutants. The mixture of these primary and secondary pollutants forms photochemical smog
    So, the correct answer is 'Ozone, peroxyacetyl nitrate, aldehydes'
  • Question 5
    1 / -0
    The common refrigerant chlorofluoromethane (Freon) and NO$$_x$$ is a serious pollutant because?
    Solution

  • Question 6
    1 / -0
    The Mathura refinery smoke is thought to reduce the shine of Taj mahal by
    Solution
    The reduction in the shine of Taj mahal is understood by the term called as marble cancer. Various pollutants are emitted by the industries situated near Agra, specially the Mathura refinery. These pollutants react with the marble forming a fine layer of dust over it and also various gases like sulphur dioxide and nitrous oxide combines with moisture and settles down as acid rain on the walls of the monument thus provides a yellow tingle to its pure white marble.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Indiscriminate use of DDT is undesirable because?
    Solution

  • Question 8
    1 / -0
    Photochemical smog is formed by 
    Solution
    The photochemical smog refers to the smog which contains a high concentration of NO$$_x$$,  ozone and other volatile compounds. The photochemical smog contains highly reactive species like NO$$_x$$, hydrocarbons and ozone which can produce reactive radicals on reaction with sunlight. This cause destruction of the chlorophyll pigments, blazing and bleaching of the leaves and other parts of the plants. 
    Thus, the correct answer is option D. 

  • Question 9
    1 / -0
    Increase skin cancer and higher mutation rates are generally the consequences of
    Solution
    The ozone layer is present in the stratosphere above the Earth. The layer of ozone is responsible for the absorption of the harmful ultraviolet radiations from the solar radiations. Due to ozone depletion, these radiations enter the Earth's atmosphere and cause skin cancer. The radiations can also damage the eye and other exposed parts of the body. The radiations can also cause mutations like thymine dimer formation or breaking of the hydrogen bonds. 
    Thus, the correct answer is option B. 
  • Question 10
    1 / -0
    Changes in the chemical nature of Taj Mahal is due to
    Solution

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