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The correct set of species responsible for the photochemical smog is: 

 

 

  • Option 1)

    NO,NO_2,O_3\: \: \: \: and\: \: \:hydrocarbons

     

  • Option 2)

    N_2,NO_2,\: \: and\: \: \:hydrocarbons

  • Option 3)

    N_2,O_2,O_3\: \: and\: \: \:hydrocarbons

     

  • Option 4)

    CO_2,NO_2,SO_2\: \: and\: \: \:hydrocarbons

  Photochemical smog / oxidising smog - Occurs in warm, dry and Sunny climate - wherein Mixture of formaldehyde, acrolein, nitric oxide, ozone, and proxy-acyl nitrates (PAN)       Photochemical smog formation - Emission of nitrogen oxides and hydrocarbons from automobiles exhausts and solar energy by chain of reactions. NO3 and O3 react with unburnt hydrocarbons to produce formaldehyde,...

Air pollution that occurs in sunlight is :

  • Option 1)

     reducing smog

  • Option 2)

     acid rain

  • Option 3)

     oxidising smog

  • Option 4)

    fog

Air pollution that occurs in sunlight is oxidising smog , which is known as photochemical smog.Option 1) reducing smogOption 2) acid rainOption 3) oxidising smogOption 4)fog

The regions of the atmosphere, where clouds form and 

where we live, respectively, are:

  • Option 1)

    Troposphere and Stratosphere

  • Option 2)

     Stratosphere and Troposphere 

  • Option 3)

    Troposphere and Troposphere 

  • Option 4)

     Stratosphere and Stratosphere

 
Troposphere is the lowest region of atmosphere bounded by Earth beneath and the Stratosphere above where most of the clouds form and where life form exists. option (3) is correct. Option 1) Troposphere and Stratosphere Option 2)  Stratosphere and Troposphere  Option 3) Troposphere and Troposphere  Option 4)  Stratosphere and Stratosphere

The primary pollutant that leads to photochemical; smog is:

 

  • Option 1)

    acrolein

  • Option 2)

    nitrogen oxides

  • Option 3)

    ozone

  • Option 4)

    sulphur dioxide 

     Nitrogen Oxide  factual Based   is the main constituent to prepare PAN(peroxy actual Nitrate ) that is main component of photochemical smog.    Option 1)acroleinOption 2)nitrogen oxidesOption 3)ozoneOption 4)sulphur dioxide 

The maximum prescribed concentration of copper in drinking water is:

  • Option 1)

    5 ppm

  • Option 2)

    0.05 ppm

  • Option 3)

    0.5 ppm

  • Option 4)

    3 ppm

Factual based Safe limit of copper is 3 ppmOption 1)5 ppmOption 2)0.05 ppmOption 3)0.5 ppmOption 4)3 ppm

Excessive release of CO_{2} into the atmosphere results in :

  • Option 1)

    global\: warming

  • Option 2)

    polar\: vortex

  • Option 3)

    formation\: of \: smog

  • Option 4)

     depletion\: of\: ozone

Excessive release of  into the atmospheric results global warming.Option 1)Option 2)Option 3)Option 4) 

Assertion: Ozone is destroyed by CFCs in the upper stratosphere.

Reason: Ozone holes increase the amount of UV radiation reaching the earth.
 

  • Option 1)

    Assertion and reason are correct, but the reason is not the explanation for the assertion.
     

  • Option 2)

    Assertion and reason are incorrect.

  • Option 3)

    Assertion is false, but the reason is correct.

     

  • Option 4)

    Assertion reason are both correct, and the reason is the correct explanation for the assertion.

Assertion and reason are correct, but the reason is not the explanation for the assertion. Due to depletion of ozone layer more UV radiation filters into troposphere.Option 1)Assertion and reason are correct, but the reason is not the explanation for the assertion.  Option 2)Assertion and reason are incorrect.Option 3)Assertion is false, but the reason is correct.  Option 4)Assertion reason...

Which is wrong with respect to our responsibility as a human being to protect our environment ?

  • Option 1)

    Restricting the use of vehicles

  • Option 2)

    Avoiding the use of floodlighted facilities.

  • Option 3)

    Using plastic bags.

  • Option 4)

    Setting up compost tin in gardens

 
Factual based. Using plastic bags is wrong with respect to our responsibility as a human being to protect our environment. Option 1) Restricting the use of vehicles Option 2) Avoiding the use of floodlighted facilities. Option 3) Using plastic bags. Option 4) Setting up compost tin in gardens

 Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

  • Option 1)

     O3 and CO2

  • Option 2)

     CO2 and NO2

  • Option 3)

    SO2 and NO2

  • Option 4)

    SO2 and O3

     

 
Option 1)  O3 and CO2 Option 2)  CO2 and NO2 Option 3) SO2 and NO2 Option 4) SO2 and O3  

Peroxyacetyl nitrate ( PAN ) , an eye irritant is produced by :

  • Option 1)

    Classical smog.

  • Option 2)

    Acid rain.

  • Option 3)

    Photochemical smog .

  • Option 4)

    Organic waste.

Option 3)

Photochemical smog. 

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :

  • Option 1)

    Soil pollution 

  • Option 2)

    global warming 

  • Option 3)

    water pollution 

  • Option 4)

    acid rain

  Harmful effects of Acid rain - Damages plants, causes leaching of essential minerals of soil, respiration problems, ruin fresh water reservoirs, corrodes metals, marbles, etc. - Due to acid rain, the Taj Mahal is being slowly disfigured and discoloured.   Acid rain - Rainfall and other precipitation with a pH of less than 5.6 . Acidic components, sulphuric acid and nitric acid, are emitted...

The concentration of dissolved oxygen (DO) in cold water can go upto :

  • Option 1)

    16 ppm

  • Option 2)

    10 ppm

  • Option 3)

    14 ppm

  • Option 4)

    8 ppm

@1948 Dissolved oxygen (DO) - Amount of oxygen that water can hold in the solution - wherein DO in cold water = 10 ppm.    Option 1)16 ppmOption 2)10 ppmOption 3)14 ppmOption 4)8 ppm

The higher concentration of which gas in air can cause stiffness of flower buds ?

  • Option 1)

    CO_{2}

  • Option 2)

    SO_{2}

  • Option 3)

    NO_{2}

  • Option 4)

    CO

  Control of air pollution - Automobiles 1 Use of catalytic converters 2 Unleaded petrol 3 low sulphur oxide - wherein  prevent release of nitrogen oxide and hydrocarbons The higher concentration of SO2 gas in air can cause stiffness of flower bonds.     Harmful effect of particulate pollutants -  Lodge in the nasal passage and enter into lungs. Lead interferes with the development and...

The compound that is NOT a common component of photochemiclal smog is :

  • Option 1)

     

  • Option 2)

    CH_{2}= CHCHO

  • Option 3)

    CF_{2}Cl_{2}

  • Option 4)

    O_{3}

  Photochemical smog / oxidising smog - Occurs in warm, dry and Sunny climate - wherein Mixture of formaldehyde, acrolein, nitric oxide, ozone, and proxy-acyl nitrates (PAN)     Photochemical smog formation - Emission of nitrogen oxides and hydrocarbons from automobiles exhausts and solar energy by chain of reactions. NO3 and O3 react with unburnt hydrocarbons to produce formaldehyde, aerolein...

The upper stratosphere consisting of the ozone layer protects us from the sun's radiation that falls in the wavelength region of :

  • Option 1)

    600 - 750 nm

  • Option 2)

    400 - 550 nm

  • Option 3)

    0.8 - 1.5 nm

  • Option 4)

    200 - 315 nm 

  Stratosphere - Second layer of atmosphere , just above the troposphere - wherein Extends between 10 and 50 km above sea level.       Stratospheric pollutions - Depletion of ozone layer due to certain compounds like nitrogen oxides , CFCs etc. As we have learned in ozone layer . Ozone protects most of the medium frequency ultraviolet light from 200-315 nm wavelength        Option 1)600 - 750...

The reaction thst is NOT involve in the ozone layer depletion mechanism in the stratosohere is:

  • Option 1)

    HOCl_{\left ( g \right )}\overset{hv}{\rightarrow}OH_{\left ( g \right )}+Cl_{\left ( g \right )}

     

     

     

  • Option 2)

     

    .\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: .\\* ClO_{\left ( g \right )}+O_{\left ( g\ \right )}\rightarrow Cl_{\left ( g \right )}+O_{2\left ( g \right )}

  • Option 3)

    \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: . \: \: \: \: \: \: \: \: \: \: \: \: \: .\\*CF_{2}Cl_{2\left ( g \right )}\overset{uv}{\rightarrow}Cl_{\left ( g \right )}+CF_{2}Cl_{\left ( g \right )}

  • Option 4)

    CH_{4}+2O_{3}\rightarrow 3CH_{2}=O+3H_{2}O

  Breakdown of ozone - CFCs in stratosphere absorbs UV radiations and form chlorine free radical, which continuously breakdown the ozone. - wherein As we have learned in ozone layer depletion . Ozone layer is depleted due to various pollutants and the reaction which is not involved is -    Option 1)      Option 2)  Option 3)Option 4)

Water filled in two glasses A and B have BOD values of 10 and 20 , respectively . The correct statement regarding them , is 

  • Option 1)

    B is more polluted than A .

  • Option 2)

    A is suitable for drinking , whereas B is not .

  • Option 3)

    Both A and B are suitable for drinking .

  • Option 4)

    A is more polluted than B .

  Biochemical oxygen demand (BOD) - The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste. - wherein Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more. As we have learnt in BOD 3-5 ppm is clean 6-19 ppm is polluted Hence 'B' is more polluted than 'A'.    Option 1)B is more polluted than A...

Water samples with BOD values of 4 ppm and 18 ppm, respectively, are :

  • Option 1)

    Clean and Highly polluted

  • Option 2)

    Highly polluted and Highly polluted 

  • Option 3)

    Clean and Clean 

  • Option 4)

    Highly polluted and Clean

 

Biochemical oxygen demand (BOD) -

The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste.

- wherein

Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more.

As we have learned in BOD that clear water would have BOD value of less than 5ppm where as highly polluted water could have  is BOD value of 15ppm or max

 


Option 1)

Clean and Highly polluted

Option 2)

Highly polluted and Highly polluted 

Option 3)

Clean and Clean 

Option 4)

Highly polluted and Clean

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The molecule that has minimum/ no role in the formation of photochemical smog, is :

  • Option 1)

    N_{2}

  • Option 2)

    CH_{2}=O

  • Option 3)

    O_{3}

  • Option 4)

    NO

  Photochemical smog formation - Emission of nitrogen oxides and hydrocarbons from automobiles exhausts and solar energy by chain of reactions. NO3 and O3 react with unburnt hydrocarbons to produce formaldehyde, aerolein and proxy-acyl nitrates (PAN) - wherein                            (PAN) As we haveleared is photo chemical smog mainly we know that NO2 ,O3 and hydrocarbons are...

The  pH  of rain water , is approximately :

  • Option 1)

    6.5

  • Option 2)

    7.5

  • Option 3)

    5.6

  • Option 4)

    7.0

  Water pollution - Contamination of water bodies that is unfit for human use and growth of aquatic biota. -     Global warming - Increase in average air temperature near the earth’s surface and melting of polar ice caps. - wherein  Due to over-emittance of greenhouse gases.     Point sources of water pollution. - Which arises from single, identifiable sources . - wherein Pipe, ditch The fact...
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