Pollutants and Their Classification

Q. Which of the followings is incorrect? Addition of Phosphate containing fertilizers into water causes –

1. Decrease in amount of dissolved oxygen in water.
2. Eutrophication
3. Increase in fish population
4. Enhanced growth of algae

Q. Example of primary pollutant:

1. $C{O}_2$
2. $CO$
3. Hydrocarbon
4. $S{O}_2$

Q.

Which among the following plants can metobolise nitrogen oxides?

(1)Coconut (2) Pinus (3) Juniparus (4) Quereus

1. 1 and 2

2. 3 only

3. 1, 2 and 3

4. 2, 3 and 4

Q. In highly polluted water BOD value shows a range of

1. 17-50 ppm
2. 10-14 ppm
3. 7-12 ppm
4. 2-8 ppm

Q. Loam soil contains equal amounts of

1. sand
2. silt
3. clay, humus, air and water
4. all of the above.

Q. Identify the pollutant gases which are responsible for the discolouration of marbles in the Taj Mahal.

1. $S{O}_{2}andN{O}_2$
2. $S{O}_{2}and{O}_3$
3. $C{H}_{4}andN{O}_2$
4. $O_{3}andC{O}_2$

Q. Which of the following is a secondary pollutant?

1. $C{O}_2$
2. $N_{2}O$
3. $S{O}_2$
   
4. $PAN$

Q. Photochemical smog consists of an excessive amount of X, in addition to aldehydes, ketones and peroxyacetylnitrates (PAN). X is:

1. $C{H}_4$
2. $CO$
3. $C{O}_2$
4. $O_3$

Q. Excess of which of the following in drinking water is the cause of 'blue baby' syndrome?

1. Nitrates
2. Sulphates
3. Fluorides
4. Iron

Q. If BOD of river is high, it means that the river is:

1. Not polluted
2. Very much polluted with inorganic chemicals
3. Very much polluted with organic chemicals which are decomposed by micro-organisms
4. Polluted with pesticides

Q. Pathogens are –

1. Bacteria and other organisms
2. Pesticides
3. Organic wastes
4. Chemical pollutants

Q. Assertion (A): Use of Chlorofluorocarbons (CFC’s) is hazardous to environment. Reason (R): CFC’s are very reactive, flammable and toxic gases.

1. Both A and R are correct and R is the correct explanation of A.
2. Both A and R are correct but R is not the correct explanation of A.
3. A is correct but R are not correct.
4. A is not correct but R is correct.

Q.

Normal rain has pH between ______ and ______

Q. $S{O}_2$, as a pollutant can be controlled by:
(I) Using solar energy, nuclear energy, hydroelectric energy.
(II) Using low-sulphur fuels, natural gas.
(III) The desulphurisation of high-sulphur coal and oil before burning by FGD (Fuel-gas desulphurisation).
(IV) Using water under high pressure.
The correct methods are:

1. Both I and II
2. Both I and III
3. I, II and IV
4. I, II and III

Q. A brick kiln should not be allowed near an orchard:

1. To save plants from soil erosion
2. To save fruits from laborers
3. To save plants from smoke and toxic gases emitted by kiln
4. To save plants from transport vehicles

Q. Nitrogen is a green-house gas.

1. True
2. False

Q. Addition of phosphate fertilizers into water leads to

1. Increased growth of decomposers
2. Reduced algae growth
3. Increased algae growth
4. Nutrient enrichment(eutrophication)

Q. Ozone in the stratosphere is depleted by:

1. $C{F}_{2}C{l}_2$
2. $C_7{F}_{1}6$
3. $C_6{H}_{6}C{l}_6$
4. $C_6{F}_6$

Q. $S{O}_2$, as a pollutant can be controlled by:
(I) Using solar energy, nuclear energy, hydroelectric energy.
(II) Using low-sulphur fuels, natural gas.
(III) The desulphurisation of high-sulphur coal and oil before burning by FGD (Fuel-gas desulphurisation).
(IV) Using water under high pressure.
The correct methods are:

1. Both I and II
2. Both I and III
3. I, II and IV
4. I, II and III

Q. Green chemistry is the branch of chemistry that involves study of processes and products that minimise the use of _____ substances.

1. useful
2. hazardous
3. microscopic
4. eco-friendly

Q. Which of the following statement is not true? Reforestation will-

1. transpire more water vapour
2. cause more rain fall
3. increase pollution by particulate matter
4. raise the underground water level.

Q. Match column I with column II:
$\begin{array}{cc}\text{Column - I}& \text{Column - II}\\ \text{i.}Cr(OH{)}_3+H_2{O}_2\text{in basic medium}& \text{p.}CO+H_2\\ \text{ii. Acidic}KMn{O}_4+H_2{O}_2& \text{q.}N{H}_3\\ \text{iii.}C{a}_3{N}_2+H_{2}O& \text{r. Water-gas}\\ \text{iv. Red-hot coke + steam (at 1273 K, Ni catalyst)}& \text{s. Yellow solution}\\ & \text{t.}Ca(OH{)}_2\\ & \text{u. Solution decolourised}\end{array}$

1. $\text{(i-s), (ii-u), (iii-q, t), (iv-p, r)}$
2. $\text{(i-r), (ii-t), (iii-q, u), (iv-p, s)}$
3. $\text{(i-u), (ii-s), (iii-q, t), (iv-p, r)}$
4. $\text{(i-u), (ii-s), (iii-q, t), (iv-p, r)}$

Q. What is environment chemistry? Discuss its social relevance.