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Environmental Chemistry

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Question
CBSEENCH11008398
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Green chemistry means such reactions which 

  • produce colour during reactions

  • reduce the use and production of hazardous chemicals

  • are related to the depletion of the ozone layer

  • study the reactions in plants

Solution

B.

reduce the use and production of hazardous chemicals

Green chemistry involves such reactions which reduce the use and production of hazardous or toxic chemical to reduce pollution from the environment.

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Question
CBSEENCH11008458
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Which of the following is a sink for CO?

  • Haemoglobin

  • Micro-organisms present in the soil

  • Oceans

  • Plants

Solution

B.

Micro-organisms present in the soil

Micro-organisms present in the soil is a sink for CO

Question
CBSEENCH11008279
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Which one of  the following statements regarding photochemical smog is not correct?

  • Carbon monoxide does not play any role in photochemical smog formation

  • Photochemical smog is an oxidising agent in character

  • Photochemical smog is formed through photochemical reaction involving solar energy

  • Photochemical smog does not cause irritation in eyes and throat. 

Solution

D.

Photochemical smog does not cause irritation in eyes and throat. 

Photochemical smog is formed in warm and sunny climate during day time by the action of sunlight on primary pollutants. It contains nitrogen oxides, ozone, PAN etc. , which are oxidising in nature. so, photochemical smog is an oxidising agent in character. it causes irritation in eyes and throat. 

Question
CBSEENCH11008249
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Which one of the following is not a common component of photochemical smog?

  • Ozone

  • Acrolein

  • Peroxyacetyl nitrate

  • Chlorofluorocarbons

Solution

A.

Ozone

Among the given chlorofluorocarbons are the compounds that are responsible for ozone depletion which degrades ozone into molecular oxygen. It is not a component of photochemical smog. while other given compounds are the main components of photochemical smog.

Question
CBSEENCH11008490
Wired Faculty App

Which of the following region is coldest?

  • Stratosphere

  • Troposphere

  • Mesosphere

  • Thermosphere

Solution

B.

Troposphere

Meso-sphere is the coldest region having about - 100o C temperature.

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