#### 11th Standard Chemistry Environmental Chemistry English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. Photo chemical smog formed in congested metropolitan cities mainly consists of

(a)

Ozone, SO2 and hydrocarbons

(b)

Ozone, PAN and NO2

(c)

PAN, smoke and SO2

(d)

Hydrocarbons, SO2 and CO2

2. Ozone depletion will cause

(a)

forest fires

(b)

eutrophication

(c)

bio magnification

(d)

global warming

3. Living in the atmosphere of CO is dangerous because it

(a)

Combines with O2 present inside to form CO2

(b)

Reduces organic matter of tissues

(c)

Combines with haemoglobin and makes it incapable to absorb oxygen

(d)

Dries up the blood

4. Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be

(a)

highly polluted

(b)

poor in dissolved oxygen

(c)

rich in dissolved oxygen

(d)

low COD

5. Assertion (A): Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.

(a)

Both (A) and R are correct and (R) is the correct explanation of (A)

(b)

Both (A) and R are correct and (R) is not the correct explanation of (A)

(c)

Both (A) and R are not correct

(d)

(A) is correct but( R) is not correct

6. Which of the following is responsible for acid rain?

(a)

CO2

(b)

NO2

(c)

CO2

(d)

All of these

7. High concentration of lead in human blood damages

(a)

Brain

(b)

Liver

(c)

Both (a) & (b)

(d)

Neither (a) nor (b)

8. Identify the secondary pollutant among the following

(a)

CO

(b)

O3

(c)

Pb

(d)

CH4

9. NO2 and SO2 have some properties in common. Which property shown by one of these compounds, but not by the other?

(a)

Forms acid

(b)

Is a reducing agent

(c)

Is soluble in water

(d)

is a it is used as a food-preservative

10. The layer of atmosphere which extends upto 10 km from sea level is called ______

(a)

Troposphere

(b)

Stratosphere

(c)

Ionosphere

(d)

Mesosphere

11. Which one of the following is not a property of classical smog?

(a)

Secondary pollutants play significant role

(b)

Occurs at low temperature

(c)

Contains SO2

(d)

Dark brown coloured

12. Earth is protected from UV rays by

(a)

N2

(b)

O2

(c)

SO2

(d)

O3

13. Statement I: Ozone depletion potential is maximum is CFC's
Statement II: CFC looses active chlorine

(a)

Both statement I and statement II are true and, statement II explains statement I

(b)

Both statement I and statement, II are true but statement II does not explain statement I

(c)

Statement I is true but statement II is false

(d)

Both statement I and II are false

14. Identify the component of photechemical smog which is not the common one.

(a)

Acrolein

(b)

Ozone

(c)

Peroxyacetyl nitrate

(d)

CFCs

15. Most common and commercial water pollutant is

(a)

industrial waste

(b)

fertilizers

(c)

detergents

(d)

PCB's

16. Decomposition of organic matter through microbial activity is known as

(a)

Eutrophication

(b)

Putrescibility

(c)

BOD

(d)

Stratification

17. Green chemistry means such reaction which

(a)

Study the reaction in plants

(b)

Are related to the depletion of ozone layer

(c)

Reduce the use and production of hazardous chemicals

(d)

Produce colour. during reactions

18. Statement I : Productivity of eutrophic lake is maximum.
Statement II : Cation is mainly due to adding of $SO_{4}^{2-}$and heavy metals

(a)

Both statement I and statement II are true and statement II explains statement I

(b)

Both statement I and statement II are true but statement II does not explain statement I

(c)

Statement I is true but statement II is false

(d)

Both statement I and II are false

19. Which of the following pair of oxides is responsible for acid rain?

(a)

SO3 +NO2

(b)

CO2 + CO

(c)

N2O + CH4

(d)

O2 + H2

20. Which of the following is not a greenhouse gas?

(a)

CO

(b)

O3

(c)

CH4

(d)

Water vapours