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Standard VIII

Biology

Causes of Air Pollution: Natural Activities and Human Activities

Question 15Oz...

Question

Question 15
Ozone-layer is getting depleted because of

(a) excessive use of automobiles
(b) excessive formation of industrial units
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) excessive deforestation.

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Solution

(c) excessive use of man-made compounds containing both fluorine and chlorine

Reduction in the concentration of ozone layer is called ozone depletion. It is caused by certain chemicals which are generally rich in chlorine, fluorine and carbon and are called Ozone Depleting Substances (ODS).

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Similar questions

Question 15
Ozone-layer is getting depleted because of

(a) excessive use of automobiles
(b) excessive formation of industrial units
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) excessive deforestation.

Question 28
Soil erosion can be prevented by:

(a) raising forests
(b) deforestation
(c) excessive use of fertilizer
(d) overgrazing by animals

Question 28
Soil erosion can be prevented by:

(a) raising forests
(b) deforestation
(c) excessive use of fertilizer
(d) overgrazing by animals

Q. When excess of ammonia is used:

3 C l_{2} + 8 N H_{3}

⟶

A + B

When excess of chlorine is used:

3 C l_{2} + 4 N H_{3}

⟶

C + D

The oxidation state of nitrogen in compound

D

is:

Q. When excess of ammonia is used:

3 C l_{2} + 8 N H_{3}

⟶

A + B

When excess of chlorine is used:

3 C l_{2} + 4 N H_{3}

⟶

C + D

Oxidation state of nitrogen in compound

A

a

and Oxidation state of nitrogen in compound

D

d

. Value of

a - d

is:

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Causes of Air Pollution: Natural Activities and Human Activities

Standard VIII Biology

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Question 15 Ozone-layer is getting depleted because of (a) excessive use of automobiles (b) excessive formation of industrial units (c) excessive use of man-made compounds containing both fluorine and chlorine (d) excessive deforestation.

(c) excessive use of man-made compounds containing both fluorine and chlorine Reduction in the concentration of ozone layer is called ozone depletion. It is caused by certain chemicals which are generally rich in chlorine, fluorine and carbon and are called Ozone Depleting Substances (ODS).

Question 15
Ozone-layer is getting depleted because of

(a) excessive use of automobiles
(b) excessive formation of industrial units
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) excessive deforestation.

(c) excessive use of man-made compounds containing both fluorine and chlorine

Reduction in the concentration of ozone layer is called ozone depletion. It is caused by certain chemicals which are generally rich in chlorine, fluorine and carbon and are called Ozone Depleting Substances (ODS).