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प्रश्न
The gas A is used by most of the animals to obtain energy from food by the process of respiration. When A is acted upon by radiation X, it gets converted into another gas B which is an allotrope of A but poisonous when inhaled. B forms a kind of layer C in the upper atmosphere which absorbs radiations X coming from a source Y and prevent them from reaching the earth. Some chemicals Z released from the various devices on the earth are destroying the layer C slowly. In fact, a hole has already been formed in layer C over the area D of the earth.
(a) What are gases (i) A, and (ii) B? Write their molecular formulae.
(b) Name the layer C.
(c) What are (i) X, (ii) Y, and (iii) Z?
(d) Name the area D.
(e) Name any two human ailments which may be caused by X.
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उत्तर
(a) (i) A is oxygen (O2), and (ii) B is ozone (O3).
(b) C is the ozone layer.
(c) (i) X is ultraviolet (UV) radiations.
(ii) Y is the sun.
(iii) Z is chlorofluorocarbons (CFCs).
(d) D is Antarctica.
(e) Skin cancer and cataract are two human ailments that may be caused by X (ultraviolet radiations).
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संबंधित प्रश्न
The prime source of chlorofluorocarbons is ______.
What would happen if the ozone layer in the atmosphere completely disappears?
What is ozone?
How does ozone layer protect us from harmful effects in the environment?
What is UNEP?
O2 is converted into O3 by the action of :
(a) infrared radiations
(b) ultraviolet radiations
(c) gamma radiations
(d) cosmic radiations
How are CFCs harmful?
Match the items in column I with the closely related ones in column II.
| Column I | Column II | ||
| (i) | Chlorofluorocarbons (CFCs) | (a) | Global warming |
| (ii) | Fly ash | (b) | Biodegradable |
| (iii) | Cow dung | (c) | Nuclear radiation pollutant |
| (iv) | CO2 and methane | (d) | Acid rain |
| (v) | Sulphur dioxide | (e) | Industrial waste |
| (vi) | Iodine-131 | (f) | Ozone depletion |
The following picture depicts a certain phenomenon
- Name the phenomenon and explain it.
- Enlist the sources that are responsible for the above mentioned phenomenon.
- List out the effects of the above phenomenon on humans.
State two effects of ozone depletion.
Which Gas is present in large amount in the upper part of stratosphere.
Give balanced equations for formation of ozone molecules from oxygen molecules. What type of reaction takes place, during the formation.
Select the correct answer from the following statement:
The gas which in presence of U.V. light gives two atoms of the same gas.
Give reason for the following:
The formation of ozone involves a chemical reaction called photolysis.
Long answer type question
Montreal protocol is an essential step. Why is it so?
Why was there a sharp in the amount of ozone in the atmosphere in 1980’s.
Write the full form of CFCs.
