Chemistry
Assertion (A): Atmosphere plays an important role in maintaining the temperature on earth.
Reason (R): Atmosphere absorbs some radiations coming from the sun and transmits near ultraviolet, visible and near infra red radiations.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Pollution
2 Likes
Answer
Both A and R are true and R is the correct explanation of A.
Explanation— The atmosphere acts like a blanket, and plays an important role in maintaining the temperature on earth. Hence, the assertion (A) is true.
The atmosphere absorbs harmful ultraviolet radiation (mainly by the ozone layer). It allows most visible light, near UV, and near IR to pass through, which warms Earth’s surface. These properties are essential for Earth’s energy balance. Hence, the reason (R) is true and reason (R) is the correct explanation of assertion (A).
Answered By
1 Like
Related Questions
Assertion (A): The formation of ozone involves a chemical reaction called photolysis.
Reason (R): The highly energetic ultraviolet radiation from the sun breaks the oxygen molecules into oxygen atoms. Oxygen atoms then react with oxygen molecules to form ozone.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Photochemical smog is composed of oxides of nitrogen, ozone, peroxyacetyl nitrates and other organic compounds.
Reason (R): Photochemical smog is formed by the interaction of certain pollutants in cold weather conditions.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): UV radiations break ozone into O2 and O.
Reason (R): Ozone hole is responsible for global warming and climate change.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Fill in the blanks:
(a) The pollutants such as NO2, SO2 and SO3 dissolved in the moisture of air are the cause of ……………
(b) Excessive release of carbon dioxide in the atmosphere is the cause of …………… effect which produces global warming.
(c) Ozone layer prevents the harmful …………… radiation of the sun to reach the earth.
(d) Decrease in the concentration of ozone in the stratosphere is the cause of the formation of …………… holes.
(e) Ozone depletion is mainly caused by the active …………… atoms generated from CFC in the presence of UV radiation.