Pollutants and Their Classification

Q.

What are primary pollutants? Give examples.

Q. Which of the following is a sink for $CO$?

1. Oceans
2. Plants
3. Haemoglobin
4. Micro-organisms present in the soil

Q.

How is water pollution measured?

Q. The non-viable particulate among the following is:

1. dust
2. bacteria
3. moulds
4. fungi

Q. The viable particulate among the following is:

1. fumes
2. algae
3. smoke
4. mist

Q. Negative soil pollution is

1. Reduction in soil productivity due to erosion and over use

2. Reduction in soil productivity due to additon of pesticidies and industrial waste
3. Converting fertile land into barren land by dumping ash, sludge and garbage
4. None of the above

Q.

What is the term used when the rainwater has a pH less than $5.6$?

Q.

Name two common types of pollutants in air.

Q. The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water, is called ________

1. BOD
2. ABE
3. COD
4. Standard amount of oxygen

Q. The value of biological oxygen demand(BOD) of highly polluted water is:

1. > 16 ppm
2. < 5 ppm
3. = 5 ppm
4. = 16 ppm

Q.

Poisonous gas that can be prepared from chlorine gas is

1. Laughing gas

2. COCl₂

3. Water gas

4. Tear gas

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. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

1. Assertion is correct but Reason is incorrect
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Both Assertion and Reason are incorrect
4. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Q.

A water sample has $\mathrm{ppm}$ level concentration of following anions

${\mathrm{F}}^{-}=10;{\mathrm{SO}}_4^{2-}=100;{\mathrm{NO}}_3^{-}=50$

The anion/ anions that makes the water sample unsuitable for drinking is/are:

1. Only ${\mathrm{F}}^{-}$

2. Only ${\mathrm{SO}}_4^{2-}$

3. Only ${\mathrm{NO}}_3^{-}$

4. Only ${\mathrm{SO}}_4^{2-}\mathrm{and}{\mathrm{NO}}_3^{-}$

Q.

Green chemistry used in day -to-day life for

1. Cleaning cloth with water

2. Using liquid ${\mathrm{H}}_2{\mathrm{O}}_2$ in dying clothes

3. Using tetrachloroethane in laundries

4. Using chlorine in bleaching paper

Q. Which of the following is not the example of non-degradable pollutants?

1. Waste Organic Matter
2. DDT
3. Heavy metals
4. Plastics

Q.

Why does eutrophication lead to dead zones?

Q. Taj mahal is badly affected by acid rain. This is because-

1. Taj mahal is made of marble
2. Acid rain attacks the steel structure of Taj mahal
3. Acid rain has a pH above 5.6
4. The paint on Taj mahal is soluble in acids.

Q. Which of the following is not a component of photochemical smog?

1. Acrolein
2. Ozone
3. Peroxyacetyl nitrate
4. Sulphur dioxide

Q.

Of the following naturally occurring metals which one pollutes the air of a big city

1. Lead

2. Copper

3. Chromium

4. Zinc

Q.

Write a note on the discovery of oxygen.

Q.

A river with an inflow of domestic sewage rich in organic waste may result in

1. Death of fish due to lack of oxygen

2. An increased production of fish due to biodegradable nutrients

3. Increased population of aquatic food web organisms

4. The river will dry up very soon due to the algal bloom

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. Out of $S{O}_2$, $CO$, $O_3$, $NO$ and peroxyacetyl nitrate (PAN), the primary and secondary pollutants are:

1. Primary- $S{O}_2,O_3,NO$
   Secondary- $CO,PAN$
2. Primary- $S{O}_2,NO$
   Secondary- $PAN,O_3,CO$
3. Primary- $S{O}_2,CO,NO$
   Secondary- $PAN{O}_3$
4. Primary- $PAN,O_3$
   Secondary- $S{O}_2,CO,NO$

Q.

What is detritus in an aquarium?

Q. Tetrachloroethane which was earlier used as solvent for dry cleaning, has been replaced by

1. Alum
2. Chlorine gas
3. Ethanal
4. Liquid $C{O}_2$

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. Which of the following is an example of particulate pollutants?

1. Oxides of sulphur
2. Oxides of carbon
3. Oxides of nitrogen
4. None of the above

Q. Match the column I with column II and mark the appropriate choice.

1. (a) $\to$ (ii), (b) $\to$ (i), (c) $\to$ (iv), (d) $\to$ (iii)
2. (a) $\to$ (iii), (b) $\to$ (iv), (c) $\to$ (i), (d) $\to$ (ii)
3. (a) $\to$ (i), (b) $\to$ (iii), (c) $\to$ (ii), (d) $\to$ (iv)
4. (a) $\to$ (iv), (b) $\to$ (ii), (c) $\to$ (iii), (d) $\to$ (i)

Q. Taj mahal is badly affected by acid rain. This is because-

1. Taj mahal is made of marble
2. Acid rain attacks the steel structure of Taj mahal
3. Acid rain has a pH above 5.6
4. The paint on Taj mahal is soluble in acids.