Which of the following are the Green house gases?
A. Water vapour
B. Ozone
C. I$_2$
D. Molecular hydrogen
Choose the most appropriate answer from the options given below :
The radical which mainly causes ozone depletion in the presence of UV radiations is :
Match List I with List II
| LIST I | LIST II | ||
|---|---|---|---|
| A. | Nitrogen oxides in air | I. | Eutrophication |
| B. | Methane in air | II. | pH of rain water becomes 5.6 |
| C. | Carbon dioxide | III. | Global warming |
| D. | Phosphate fertilisers in water | IV. | Acid rain |
Choose the correct answer from the options given below :
Which of the following compounds is an example of Freon?
Given below are two statements:
Statement I : If BOD is 4 ppm and dissolved oxygen is 8 ppm, then it is a good quality water.
Statement II : If the concentration of zinc and nitrate salts are $5 ~\mathrm{ppm}$ each, then it can be a good quality water.
In the light of the above statements, choose the most appropriate answer from the options given below :
The delicate balance of $\mathrm{CO}_{2}$ and $\mathrm{O}_{2}$ is NOT disturbed by :
Match List I with List II
| List I Industry |
List II Waste Generated |
||
|---|---|---|---|
| (A) | Steel plants | (I) | Gypsum |
| (B) | Thermal power plants | (II) | Fly ash |
| (C) | Fertilizer industries | (III) | Slag |
| (D) | Paper mills | (IV) | Bio-degradable wastes |
Choose the correct answer from the options given below :
Which of these reactions is not a part of breakdown of ozone in stratosphere?
Match List I with List II:
| LIST I (Species) |
LIST II (Maximum allowed concentration in ppm in drinking water) |
||
|---|---|---|---|
| A. | $\mathrm{F^-}$ | I. | < 50 ppm |
| B. | $\mathrm{SO_4^{2-}}$ | II. | < 5 ppm |
| C. | $\mathrm{NO_3^-}$ | III. | < 2 ppm |
| D. | $\mathrm{Zn}$ | IV. | < 500 ppm |
Choose the correct answer from the options given below :
The possibility of photochemical smog formation is more at :
The industrial activity held least responsible for global warming is :
How can photochemical smog be controlled?
Identify X, Y and Z in the following reaction. (Equation not balanced)
Formation of photochemical smog involves the following reaction in which $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are respectively.
$ \begin{aligned} & \text { i. } \mathrm{NO}_{2} \stackrel{\mathrm{h} v}{\longrightarrow} \mathrm{A}+\mathrm{B} \\ & \text { ii. } \mathrm{B}+\mathrm{O}_{2} \rightarrow \mathrm{C} \\ & \text { iii. } \mathrm{A}+\mathrm{C} \rightarrow \mathrm{NO}_{2}+\mathrm{O}_{2} \end{aligned} $
Choose the correct answer from the options given below :
The concentration of dissolved Oxygen in water for growth of fish should be more than $\mathrm{\underline X }$ ppm and Biochemical Oxygen Demand in clean water should be less than $\mathrm{\underline Y }$ ppm. X and Y in ppm are, respectively.
| $\mathrm{X}$ | $\mathrm{Y}$ |
|---|---|
| 4 | 15 |
| $\mathrm{X}$ | $\mathrm{Y}$ |
|---|---|
| 4 | 8 |
| $\mathrm{X}$ | $\mathrm{Y}$ |
|---|---|
| 6 | 12 |
| $\mathrm{X}$ | $\mathrm{Y}$ |
|---|---|
| 6 | 5 |
Correct statement about smog is :
Some reactions of NO$_2$ relevant to photochemical smog formation are
Identify A, B, X and Y :
Correct statement is :
Which of the following is true about freons?
Which among the following pairs has only herbicides?
Given below are two statements:
Statement I : In polluted water values of both dissolved oxygen and $\mathrm{BOD}$ are very low.
Statement II : Eutrophication results in decrease in the amount of dissolved oxygen.
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements:
Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry.
Statement II : The fuel obtained from plastic waste is lead free.
In the light of the above statements, choose the most appropriate answer from the options given below :
Match List I with List II.
| List I Pollutant |
List II Disease/sickness |
||
|---|---|---|---|
| (A) | Sulphate (>500 ppm) | (I) | Methemoglobinemia |
| (B) | Nitrate (>50 ppm) | (II) | Brown mottling of teeth |
| (C) | Lead (>50 ppb) | (III) | Laxative effect |
| (D) | Fluoride (>2 ppm) | (IV) | Kidney damage |
Choose the correct answer from the options given below :
Match List I with List II.
| List I Pollutant |
List II Source |
||
|---|---|---|---|
| (A) | Microorganisms | (I) | Strip mining |
| (B) | Plant nutrients | (II) | Domestic sewage |
| (C) | Toxic heavy metals | (III) | Chemical fertilizer |
| (D) | Sediment | (IV) | Chemical factory |
Choose the correct answer from the options given below :
The photochemical smog does not generally contain :
The acid that is believed to be mainly responsible for the damage of Taj Mahal is :
Correct statement about photo-chemical smog is :
On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrite gives A and B while its reaction with its reaction with HCl produces B and C. A, B and C are, respectively :
Given below are two Statements:
Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide.
Statement II : Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.
In the light of the above statements, choose the most appropriate answer from the options given below.
The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are :
Polar stratospheric clouds facilitate the formation of :
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Polluted water may have a value of BOD of the order of 17 ppm.
Reason R : BOD is a measure of oxygen required to oxidise both the bio-degradable an non-biodegradable organic material in water.
In the light of the above statements, choose the most appropriate answer from the options given below.
The eutrophication of water body results in :
Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.
Assertion (A) : Photochemical smog causes cracking of rubber.
Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing.
Choose the most appropriate answer from the options given below :
Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.
Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere.
For the above statements choose the correct answer from the options given below :
Statement I : Non-biodegradable wastes are generated by the thermal power plants.
Statement II : Bio-degradable detergents leads to eutrophication.
In the light of the above statements, choose the most appropriate answer from the options given below :
(A) Methane leads to both global warming and photochemical smog
(B) Methane is generated from paddy fields
(C) Methane is a stronger global warming gas than CO2
(D) Methane is a part of reducing smog
Choose the most appropriate answer from the options given below :
(A) excess usage of fertilisers
(B) excess usage of detergents
(C) dense plant population in water bodies
(D) lack of nutrients in water bodies that prevent plant growth
Choose the most appropriate answer from the options given below :