Environmental Chemistry Test

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Environmental Chemistry Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.

A
highly polluted.

B
not suitable for aquatic life.

C
rich in dissolved oxygen.

D
poor in dissolved oxygen.

Solution

This means water sample is rich in dissolved oxygen and is cleaner and Organic matter is balanced in the water.
Question 2
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Which of the following statements is wrong?

A
Ozone can oxidise sulphur dioxide present in the atmosphere to sulphur trioxide.

B
Ozone hole is thinning of ozone layer present in stratosphere.

C
Ozone is produced in upper stratosphere by the action of UV rays on oxygen.

D
Ozone is not responsible for green house effect.

Solution

Ozone is responsible for green house effect.
Question 3
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Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because of:

A
Large number of mosquitoes.

B
Increase in the amount of dissolved oxygen.

C
Clogging of gills by mud.

D
Decrease in the amount of dissolved oxygen in water.

Solution

water pollution causes the death of fishes because of decrease in amount of dissolved oxygen. Organic waste is decomposed by decomposers at the expense of oxygen present in the water.
Question 4
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Which of the following statements about photochemical smog is wrong?

A
It has high concentration of oxidising agents.

B
It can be controlled by controlling the release of NO₂, hydrocarbons, ozone etc.

C
Plantation of some plants like pinus helps in controlling photochemical smog.

D
It has low concentration of oxidising agent.

Solution

Photochemical smog has high concentration of oxidising agent.
Question 5
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The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is _________.

A
Hydrosphere

B
Troposphere

C
Mesosphere

D
Stratosphere

Solution

Troposphere is the lowest layer of atmosphere with a width of about 10 km
Question 6
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Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because _________.

A
the reaction can be initiated only in presence of a catalyst.

B
oxides of nitrogen are unstable.

C
N₂ and O₂ are unreactive.

D
the reaction is endothermic and requires very high temperature.

Solution

Reaction between N₂and O₂ is highly endothermic so it does not occur at room temperature
Question 7
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The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?

A
NO

B
Hydrocarbon

C
CO

D
Peroxyacetyl nitrate

Solution

Peroxyacetyl nitrate belongs to secondary pollutant.
Question 8
1 / -0

Which of the following statements is correct?

A
Ozone hole is thinning of ozone layer of stratosphere at some places.

B
Ozone hole means vanishing of ozone layer around the earth completely.

C
Ozone hole is a hole formed in the troposphere from which ozone oozes out.

D
Ozone hole is a hole formed in stratosphere from which ozone oozes out.

Solution

Ozone hole is thinning of ozone layer of stratosphere at some places due to reaction between CFC and ozone.
Question 9
1 / -0

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

A
Using plastic cans for neatly storing substances

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

C
Using bicycle for travelling small distances instead of using petrol/diesel based vehicles.

D
Using H₂O₂ for bleaching purpose instead of using chlorine based bleaching agents

Solution

Using plastic cans for neatly storing substances will not come under green chemistry as it is not based on alternate use of chemical substances.
Question 10
1 / -0

Carboxyhaemoglobin causes following things if present in human blood :

A
reduces the nerve signals

B
carbondioxide deficiency

C
reduces the bone strength

D
oxygen deficiency

Solution

carboxyhaemoglobin causes Oxygen deficiency when present in human blood. It is called as CO poisoning. It gets bound with haemoglobin and doesn't allow oxygen to bind with it.

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Environmental Chemistry Test - 7

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Environmental Chemistry Test - 7

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Question 1

highly polluted.

not suitable for aquatic life.

rich in dissolved oxygen.

poor in dissolved oxygen.

Solution

Question 2

Ozone can oxidise sulphur dioxide present in the atmosphere to sulphur trioxide.

Ozone hole is thinning of ozone layer present in stratosphere.

Ozone is produced in upper stratosphere by the action of UV rays on oxygen.

Ozone is not responsible for green house effect.

Solution

Question 3

Large number of mosquitoes.

Increase in the amount of dissolved oxygen.

Clogging of gills by mud.

Decrease in the amount of dissolved oxygen in water.

Solution

Question 4

It has high concentration of oxidising agents.

It can be controlled by controlling the release of NO2, hydrocarbons, ozone etc.

Plantation of some plants like pinus helps in controlling photochemical smog.

It has low concentration of oxidising agent.

Solution

Question 5

Hydrosphere

Troposphere

Mesosphere

Stratosphere

Solution

Question 6

the reaction can be initiated only in presence of a catalyst.

oxides of nitrogen are unstable.

N2 and O2 are unreactive.

the reaction is endothermic and requires very high temperature.

Solution

Question 7

NO

Hydrocarbon

CO

Peroxyacetyl nitrate

Solution

Question 8

Ozone hole is thinning of ozone layer of stratosphere at some places.

Ozone hole means vanishing of ozone layer around the earth completely.

Ozone hole is a hole formed in the troposphere from which ozone oozes out.

Ozone hole is a hole formed in stratosphere from which ozone oozes out.

Solution

Question 9

Using plastic cans for neatly storing substances

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

Using bicycle for travelling small distances instead of using petrol/diesel based vehicles.

Using H2O2 for bleaching purpose instead of using chlorine based bleaching agents

Solution

Question 10

reduces the nerve signals

carbondioxide deficiency

reduces the bone strength

oxygen deficiency

Solution

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It can be controlled by controlling the release of NO₂, hydrocarbons, ozone etc.

N₂ and O₂ are unreactive.

Using H₂O₂ for bleaching purpose instead of using chlorine based bleaching agents