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The greenhouse effect is because of the [1996]- a)presence of gases, which in general are strong infrared absorbers, in the atmosphere
- b)presence of CO2 only in the atmosphere
- c)pressure of O3 and CH4 in the atmosphere
- d)N2O and chlorofluorohydrocarbons in the atmosphere
Correct answer is option 'A'. Can you explain this answer?
The greenhouse effect is because of the [1996]
a)
presence of gases, which in general are strong infrared absorbers, in the atmosphere
b)
presence of CO2 only in the atmosphere
c)
pressure of O3 and CH4 in the atmosphere
d)
N2O and chlorofluorohydrocarbons in the atmosphere
|
Nayanika Reddy answered |
Green house gases such as CO2, ozone, methane, the chlorofluoro carbon compounds and water vapour form a thick cover around the earth which prevents the IR rays emitted by the earth to escape. It gradually leads to increase in temperature of atmosphere.
Roasting of sulphides gives the gas X as a by product. This is colorless gas with choking smell of burnt sulphur and caused great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is : [NEET 2013]- a)SO2
- b)CO2
- c)SO3
- d)H2S
Correct answer is option 'A'. Can you explain this answer?
Roasting of sulphides gives the gas X as a by product. This is colorless gas with choking smell of burnt sulphur and caused great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is : [NEET 2013]
a)
SO2
b)
CO2
c)
SO3
d)
H2S
|
Krish Saha answered |
Based on the features given above the gas must be SO2
Which one of the following statement is not true ?[2011]- a)pH of drinking water should be between 5.5 – 9.5.
- b)Concentration of DO below 6 ppm is good for the growth of fish.
- c)Clean water would have a BOD value of less than 5 ppm.
- d)Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.
Correct answer is option 'B'. Can you explain this answer?
Which one of the following statement is not true ?[2011]
a)
pH of drinking water should be between 5.5 – 9.5.
b)
Concentration of DO below 6 ppm is good for the growth of fish.
c)
Clean water would have a BOD value of less than 5 ppm.
d)
Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.
|
Lavanya Menon answered |
The ideal value of D.O for growth of fishes is 8 mg/ℓ . 7mgℓ is desirable range, below this value fishes get susceptible to desease. A value of 2 mg/ℓ or below is lethal for fishes.
Which one of the following statements is not true? [NEET Kar. 2013]- a)Dissolved oxygen (DO) in cold water can reach a concentration upto 10 ppm.
- b)Clean water would have a BOD value of 5 ppm.
- c)Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.
- d)When the pH of rain water is higher than 6.5, it is called acid rain.
Correct answer is option 'D'. Can you explain this answer?
Which one of the following statements is not true? [NEET Kar. 2013]
a)
Dissolved oxygen (DO) in cold water can reach a concentration upto 10 ppm.
b)
Clean water would have a BOD value of 5 ppm.
c)
Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.
d)
When the pH of rain water is higher than 6.5, it is called acid rain.
|
|
Lalit Yadav answered |
Acid rain is the rain water containing sulphuric acid and nitric acid which are formed from the oxides of sulphur and nitrogen present in the air as pollutants and rain water has a pH of 4-5.
Green chemistry means such reactions which :- a)produce colour during reactions [2008]
- b)reduce the use and production of hazardous chemicals
- c)are related to the depletion of ozone layer
- d)study the reactions in plants
Correct answer is option 'B'. Can you explain this answer?
Green chemistry means such reactions which :
a)
produce colour during reactions [2008]
b)
reduce the use and production of hazardous chemicals
c)
are related to the depletion of ozone layer
d)
study the reactions in plants
|
Prashanth Dasgupta answered |
Green chemistry may be defined as the programme of developing new chemical products and chemical processes or making improvements in the already existing compounds and processes so as to make less harmful to human health and environment. This means the same as to reduce the use and production of hazardous chemicals. i.e. correct answer is option (b).
Which of the following is/are the hazardous pollutant(s) present in automobile exhaust gases? (i)N2 (ii) CO (iii) CH4 (iv) Oxides of nitrogen
- a)(ii) and (iii)
- b)(i) and (ii) [1996]
- c)(ii) and (iv)
- d)(i) and (iii)
Correct answer is option 'C'. Can you explain this answer?
Which of the following is/are the hazardous pollutant(s) present in automobile exhaust gases? (i)N2 (ii) CO (iii) CH4 (iv) Oxides of nitrogen
a)
(ii) and (iii)
b)
(i) and (ii) [1996]
c)
(ii) and (iv)
d)
(i) and (iii)
|
Dipanjan Mehta answered |
CO and oxides of Nitr ogen ar e poisnous gases present in automobile exhaust gases.
Which one of the following statements regarding photochemical smog is not correct? [2012]- a)Carbon monoxide does not play any role in photochemical smog formation.
- b)Photochemical smog is an oxidising agent in character.
- c)Photochemical smog is formed through photochemical reaction involving solar energy.
- d)Photo chemical smog does not cause irritation in eyes and throat.
Correct answer is option 'D'. Can you explain this answer?
Which one of the following statements regarding photochemical smog is not correct? [2012]
a)
Carbon monoxide does not play any role in photochemical smog formation.
b)
Photochemical smog is an oxidising agent in character.
c)
Photochemical smog is formed through photochemical reaction involving solar energy.
d)
Photo chemical smog does not cause irritation in eyes and throat.
|
Manasa Patel answered |
The oxidised hydrocarbons and ozone in presence of humidity cause photochemical smog.
Hydrocarbons + O2, NO2, NO, O, O3 → Peroxides, formaldehyde, peroxyacetylnitrate (PAN), acrolein etc.
It is oxidising in nature and causes irritation to eyes, lungs, nose, asthamatic attack and damage plants.
Hydrocarbons + O2, NO2, NO, O, O3 → Peroxides, formaldehyde, peroxyacetylnitrate (PAN), acrolein etc.
It is oxidising in nature and causes irritation to eyes, lungs, nose, asthamatic attack and damage plants.
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Chemistry 31 Years NEET Chapterwise Solved Papers
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