Environmental Chemistry

Match List I with List II:

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Which of these reactions is not a part of breakdown of ozone in stratosphere?

The possibility of photochemical smog formation is more at :

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}+\...

The water quality of a pond was analyzed and its BOD was found to be 4. The pond has :

Correct statement about smog is :

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, respec...

Some reactions of NO\(_2\) relevant to photochemical smog formation are

Identify A, B, X and Y :

Which of the following is true about freons?

Correct statement is :

How can photochemical smog be controlled?

The industrial activity held least responsible for global warming is :

The possibility of photochemical smog formation will be minimum at :

The radical which mainly causes ozone depletion in the presence of UV radiations is :

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 :

Match List I with List II

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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 ...

Which of the following compounds is an example of Freon?

Match List I with List II

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The delicate balance of \(\mathrm{CO}_{2}\) and \(\mathrm{O}_{2}\) is NOT disturbed by :

The acid that is believed to be mainly responsible for the damage of Taj Mahal is :

Which among the following pairs has only herbicides?

Correct statement about photo-chemical smog is :

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 abov...

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, formalde...

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 :

Match List I with List II.

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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...

Polar stratospheric clouds facilitate the formation of :

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 :

Match List I with List II.

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The eutrophication of water body results in :

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 bo...

The photochemical smog does not generally contain :

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :

The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :

Which one of the following statements is NOT correct?

The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :

Which one of the following is used to remove most of plutonium from spent nuclear fuel?

In stratosphere most of the ozone formation is assisted by :

The presence of ozone in troposphere :

The conversion of hydroxyapatite occurs due to presence of F\(-\) ions in water. The correct formula of hydroxyapatite is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Photochemical smog causes cracking of rubber.Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and...

Given below are two statements :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 wit...

Given below are two statements :Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formati...

Given below are two statements :Statement I : The pH of rain water is normally 5.6.Statement II : If the pH of rain water drops below 5.6, it is called acid rain.In the light of the above statements, choose the correct answer from the optio...

The gas released during anaerobic degradation of vegetation may lead to :

Given below are two statements :Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life.Statement II : The optimum value of BOD is 6.5 ppm.In the light of the above statements, ch...