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प्रश्न
The prime source of chlorofluorocarbons is ______.
विकल्प
Domestic sewage
Refrigeration equipment
Industrial effluents
Vehicular emissions
उत्तर
The prime source of chlorofluorocarbons is refrigeration equipment.
Explanation:
Gaseous compounds, such as CFCs (chlorofluorocarbons), released from refrigerators, aerosol-sprayers and the packing material styrofoam, rise into the atmosphere.
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संबंधित प्रश्न
Ozone depletion is occurring widely in the stratosphere; it leads to an ozone hole caused mainly due to ______.
The harmful radiations absorbed by the ozone layer are ______.
Write the full name of CFC.
O2 is converted into O3 by the action of :
(a) infrared radiations
(b) ultraviolet radiations
(c) gamma radiations
(d) cosmic radiations
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.
Match the items in column I with the closely related ones in column II.
| Column l | Column lI | ||
| (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 depletion of the ozone layer is due to ______.
The chemicals leading to the formation of ozone holes.
Fill in the Blanks:
The ______ is the layer of the atmosphere that contains the protective ozone layer
Gas A, found in the upper layers of the atmosphere, is a deadly poison but is essential for all living beings. The amount of this gas started declining sharply in the 1980s.
- Identify Gas A. How is it formed at higher levels of the atmosphere?
- Why is it essential for all living beings? State the cause for the depletion of this gas.
