Environmental Chemistry Test

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Environmental Chemistry Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following practices will not come under green chemistry?

A
If possible making use of soap made of vegetable oils instead of using synthetic detergents

B
Using $$H_{2} O_{2}$$ for bleaching purpose instead of using chlorine based bleaching agents

C
using bicycle for travelling small distance instead of using petrol / diesel based vehicles

D
Using plastic cans for neatly storing substance

Solution

in chemistry Using plastic cans for neatly storing substance
Question 2
1 / -0

Planting more and more trees helps to :

A
reduce $$ CO_{2}$$ in the air

B
increase $$ CO_{2}$$ in the air

C
reduce $$ O_{2}$$ in the air

D
reduce $$ CO_{2}$$ and increase $$ O_{2}$$ in the air

Solution

after planting educe $$ CO_{2}$$ and increase $$ O_{2}$$ in the air
Question 3
1 / -0

When rain is accompanied by a thuderstorm , the collected rain water will have pH?

A
Slightly lower than that of rain water without thunderstorm

B
Slightly higher than that of rain water without thunderstorm

C
uninfluenced by occurrence of thunderstorm

D
Which depends on amount on amount of dust in air

Solution

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value. Slightly lower than that of rain water without thunderstorm.
Question 4
1 / -0

What is DDT among the following ?

A
Green house gas

B
A fertilizer

C
Biodegradable pollutant

D
None - biodegradable

Solution

DDT, Dichlorodiphenyltrichloroethane is a non-biodegradable pollutant. Here, option D is correct.
Question 5
1 / -0

Photochemical smog is caused by a light mediated reaction between

A
$$NO_2$$ and unsaturated hydrocarbons

B
$$NO_2$$ and $$O_3$$

C
$$SO_2$$ and unburnt hydrocarbons

D
$$SO_2$$ and $$O_2$$

Solution

The type of air pollution caused by photochemical smog is formed through the reaction of solar radiation with airborne pollutants like nitrogen oxides and volatile organic compounds. These compounds, which are called as primary pollutants, are often introduced into the atmosphere through automobile emissions and industrial processes. Ultraviolet light can split nitrogen dioxide into nitric oxide and monatomic oxygen, this monatomic oxygen can then react with oxygen gas to form ozone. Products like ozone, aldehydes, and peroxyacetyl nitrates are called as secondary pollutants. The mixture of these primary and secondary pollutants forms photochemical smog. Thus, the correct answer is option A.
Question 6
1 / -0

The most likely reason for the development of resistance to pesticides in insects, damaging a crop, is

A
Direct mutation

B
Acquired heritable changes

C
Random mutation

D
Genetic recombination

Solution

Insect populations become resistant to the insecticides. This is a typical evolutionary process driven by survival of the fittest individuals. Initially, resistant insects result from random mutations caused by some internal (e.g., various molecules bumping against DNA in their chromosomes) or external (e.g., solar radiation) factors. Pesticides will promote the generation of resistant organisms or that resistance to one compound will increase the rate of mutation to a second compound.
Question 7
1 / -0

Assertion :Biocides are effective against animals.
Reason :Algicides are effective against weeds.

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C
If the assertion is true but the reason is false

D
If both the assertion and reason are false

E
If the assertion is false but reason is true

Solution

The pesticides are generally broad spectrum and affect useful plants, animals and human beings. They are 'therefore' also called biocides. Algicides are effective against algal pathogens i.e., they affect on variety of organisms and blooms in water reservoirs. The chemicals used against weeds are called weedicides e.g.,2, 4-D.
So, the correct answer is 'If both the assertion and reason are false'
Question 8
1 / -0

An important product in the ozone depletion by chlorofluorocabons is

A
$$ Cl_2$$

B
$$ OCl $$

C
$$ F_2 $$

D
$$ O_2F_2 $$

Solution

$$CFCl_3$$ + electromagnetic radiation $$\rightarrow Cl^{\bullet}+ CFCl_2^{\bullet}$$
$$Cl^{\bullet} + O_3 \rightarrow ClO + O_2:$$The chlorine atom changes an ozone molecule to ordinary oxygen.
$$ClO + O_3 \rightarrow Cl^{\bullet} + O_2:$$The ClO from the previous reaction destroys a second ozone molecule and recreates the original chlorine atom, which can repeat the first reaction and continue to destroy ozone.
So, the correct answer is option B.
Question 9
1 / -0

Cochineal insects have proved very useful for the control of

A
Eicchornia

B
Cactus

C
Weeds

D
Parathenium

Solution

Cochineal is an insect that feeds on certain species of cactus and from which a scarlet dye is obtained. These included two species of the cochineal insect (Dactylopius ceylonicus and D. confuses) and the cactoblastis moth (cactoblastis sp). It lives primarily on the prickly pear cactus by feeding on moisture in its leaves. Thus, it acts as a stress on the plant.
Question 10
1 / -0

Ozonosphere occurs at height of

A
8-10 km. above poles

B
8-10 km. above equator

C
11-16 km above poles

D
11-16 km above equator

Solution

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Re-Attempt Weekly Quiz Competition

Environmental Chemistry Test - 57

Result

Environmental Chemistry Test - 57

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SHARING IS CARING

Question 1

If possible making use of soap made of vegetable oils instead of using synthetic detergents

Using $$H_{2} O_{2}$$ for bleaching purpose instead of using chlorine based bleaching agents

using bicycle for travelling small distance instead of using petrol / diesel based vehicles

Using plastic cans for neatly storing substance

Solution

Question 2

reduce $$ CO_{2}$$ in the air

increase $$ CO_{2}$$ in the air

reduce $$ O_{2}$$ in the air

reduce $$ CO_{2}$$ and increase $$ O_{2}$$ in the air

Solution

Question 3

Slightly lower than that of rain water without thunderstorm

Slightly higher than that of rain water without thunderstorm

uninfluenced by occurrence of thunderstorm

Which depends on amount on amount of dust in air

Solution

Question 4

Green house gas

A fertilizer

Biodegradable pollutant

None - biodegradable

Solution

Question 5

$$NO_2$$ and unsaturated hydrocarbons

$$NO_2$$ and $$O_3$$

$$SO_2$$ and unburnt hydrocarbons

$$SO_2$$ and $$O_2$$

Solution

Question 6

Direct mutation

Acquired heritable changes

Random mutation

Genetic recombination

Solution

Question 7

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and reason are false

If the assertion is false but reason is true

Solution

Question 8

$$ Cl_2$$

$$ OCl $$

$$ F_2 $$

$$ O_2F_2 $$

Solution

Question 9

Eicchornia

Cactus

Weeds

Parathenium

Solution

Question 10

8-10 km. above poles

8-10 km. above equator

11-16 km above poles

11-16 km above equator

Solution

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