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(A): Holes in ozone layer are observed a...

(A): Holes in ozone layer are observed at the north and the south poles by scientists.
(R): UV radiation damages eyes causing cataract of eyes.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

Verified by Experts

The correct Answer is:
B
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Ozone layer acts as one of the most important life support system. The major cause of ozone layer destruction is believed to be the release of chlorofluorocarbon compounds. UV radiation causes the chlorofluouocarbons to dissociate : CF_(2) Cl overset(hv)(rarr) Cl* +CF_(2) CI A highly reactive chlorine atomis responsible for the decomposition of ozone. Cl* + O_(3) (g) rarr ClO* + O_(2) (g) ClO* + O(g) rarr Cl* + O_(2) (g) Free radicals of chlorine decompose ozone molecules in a chain reaction. The depletion of ozone layer leading to ozone hole has, however, been mainly observed in the stratosphere over Antarctica. Special type of cloud called polar stratospheric colouds are formed over Antarctica.These clouds (contain solid HNO_(3).3H_(2)O ) play an important role in ozone depletion. ClO* + NO_(2) rarr ClONO_(2) ClONO_(2) + H_(2) O rarr HOCl + HNO_(3) ClONO_(2) + HCl rarr Cl_(2) + HNO_(3) HOCl overset(hv)(rarr) HO* + Cl* The reactive chlorine atoms thus formed are rendered to deplete ozone layer. Peeling of ozone umbrella, which protects us from UV rays is caused by:

Ozone layer acts as one of the most important life support system. The major cause of ozone layer destruction is believed to be the release of chlorofluorocarbon compounds. UV radiation causes the chlorofluouocarbons to dissociate : CF_(2) Cl overset(hv)(rarr) Cl* +CF_(2) CI A highly reactive chlorine atomis responsible for the decomposition of ozone. Cl* + O_(3) (g) rarr ClO* + O_(2) (g) ClO* + O(g) rarr Cl* + O_(2) (g) Free radicals of chlorine decompose ozone molecules in a chain reaction. The depletion of ozone layer leading to ozone hole has, however, been mainly observed in the stratosphere over Antarctica. Special type of cloud called polar stratospheric colouds are formed over Antarctica.These clouds (contain solid HNO_(3).3H_(2)O ) play an important role in ozone depletion. ClO* + NO_(2) rarr ClONO_(2) ClONO_(2) + H_(2) O rarr HOCl + HNO_(3) ClONO_(2) + HCl rarr Cl_(2) + HNO_(3) HOCl overset(hv)(rarr) HO* + Cl* The reactive chlorine atoms thus formed are rendered to deplete ozone layer. The ozone layer is present in :

Why is damage to the ozone layer a cause for concern ? What steps are being taken to limit this damage ?

A sperical balloon of radius r subtends an angle alpha at the eye of an observer, while the angle of elevation of its centre is beta . The height of the centre of the ballon is

AAKASH SERIES-ENVIRONMENTAL CHEMISTRY-LEVEL - I (EXERCISE -I) (Definition of terms , Introduction , Environmental segments - Air pollution , Water pollution)
  1. (A) Acid rains have been reported in some places which are far away fr...

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  2. (A): Nowadays surface of the earth gets heated up. (R): CO2 and wate...

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  3. (A): Holes in ozone layer are observed at the north and the south pole...

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  4. (A): CO pollution is very high from 9AM to 10 AM in Urban areas (R):...

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  5. Tajmahal is effected by

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  6. (A): The pH of normal rain is 5.6. (R) CO2 present in atmosphere abs...

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  7. Poisonous gas present in the exhaust fumes of an automobile is

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  8. Which onc of the following is mainly responsible for the depletion of ...

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  9. CFCl3 is responsible for the decomposition of ozone to oxygen. Which o...

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  10. An object is located at a height of Skrn from the surface of the carth...

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  11. Identify the correct decreasing order of the following with respect to...

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  12. When organic subtances undergo anaerobic degradation the product forme...

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  13. The type of hybridisation of carbon atoms of the molecule of the gas i...

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  14. The non-viable particulate is among the following is

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  15. The loss or reduction of chlorophyll in the leaves is termed as

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  16. The term not responsible for water pollution

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  17. The term not responsible for water pollution

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  18. Water pollution does not cause

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  19. The reagent used to detect fluoride present in water in

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  20. Whch one of the following substances is used to reactivate the de acti...

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