Ozone Layer Depletion

Q.

What are the reactions involved for ozone layer depletion in the stratosphere?

Q. In Antarctica ozone depletion is due to formation of the following compound.

1. Acrolein

2. Peroxy acetyl nitrate

3. Sulphurdioxide and sulphur trioxide

4. Chlorine nitrate

Q. Identify the wrong statement in the following :

1. Ozone layer does not permit infrared radiation from the sun to reach the earth
2. Chlorofluorocarbons are responsible for ozone layer depletion
3. Acid rain is mostly because of oxides of nitrogen and sulphur
4. Greenhouse effect is responsible for global warming

Q. Which of the following statement is true about the ozone layer?

1. It is harmful because ozone is dangerous to living organism
2. It is beneficial because oxidation reaction can proceed faster in the presence of ozone.
3. It is beneficial because ozone cuts off the UV radiation of the sun.
4. It is harmful because ozone cuts out the important radiations of the sun which are vital for photosynthesis.

Q.

Which aerosols deplete ozone?

Q. What is the range of pH of acid rain?

1. More than 5.6
2. Less than 5.6
3. In between 5.6 to 6.6
4. In between 6.0 to 6.6

Q. The most abundant hydrocarbon pollutant is-

1. ethane
2. methane
3. propane
4. butane

Q.

What do you mean by ozone hole? What are its consequences?

Q. Taj mahal is badly affected by acid rain. This is because-

1. Acid rain attacks the steel structure of Taj mahal
2. Acid rain has a pH above 5.6
3. The paint on Taj mahal is soluble in acids.
4. Taj mahal is made of marble

Q. Acid rain has a pH of-

1. below 5.6
2. 5.6
3. 7.3
4. above 5.6

Q.

Name a triatomic gas.

Q. Which one is not correct? Greenhouse effect:

1. Would result in the warming up of the earth
2. Would result in lowering the level of oceans due to high evaporation
3. Is mainly due to high concentration of CO₂ in atmosphere
4. Is influenced by gases such as CH₄, O₃ and chlorofluorocarbons

Q.

Mention one use of ozone.

Q. Ozone is an air pollutant that is a major component of:

1. Dust
2. Fog
3. Smoke
4. Photochemical smog

Q. What emissions from human activities lead to ozone depletion? And what are the principle steps in stratospheric ozone depletion caused by human activities?

Q. Ozone in the stratosphere is depleted by:

1. $C_7{F}_{1}6$
2. $C_6{H}_{6}C{l}_6$
3. $C_6{F}_6$
4. $C{F}_{2}C{l}_2$

Q. Ozone is obtained from oxygen

1. By oxidation using a catalyst
2. By silent electric discharge
3. By conversion at high pressure
4. By oxidation at high temperature

Q. The ozone layer in earth's atmosphere is crucial for human survival because it

1. reflects ultraviolet rays
2. reflects radio signals
3. reflects infrared rays
4. absorbs ultraviolet rays

Q. The following reactions occur in the stratosphere:

1. $O_2\left(g\right)+UV⟶O\left(g\right)+O\left(g\right)$
2. $O_2\left(g\right)+O\left(g\right)⟶O_3\left(g\right)$
3. $\stackrel{\cdot }{Cl}\left(g\right)+O_3\left(g\right)⟶Cl\stackrel{\cdot }{O}\left(g\right)+O_2\left(g\right)$
4. $S{O}_3+H_{2}O⟶H_{2}S{O}_4$

Q. The reaction that is not involved in the ozone layer depletion mechanism in the stratosphere is:

1. $C{F}_{2}C{l}_2\left(g\right)\stackrel{UV}{⟶}\stackrel{\bullet }{C}l\left(g\right)+\stackrel{\bullet }{C}{F}_{2}Cl\left(g\right)$
2. $C{H}_4+2O_3\to 3C{H}_2=O+3H_{2}O$
3. $HOCl\left(g\right)\stackrel{hv}{⟶}\stackrel{\bullet }{O}H\left(g\right)+\stackrel{\bullet }{C}l\left(g\right)$
4. $Cl\stackrel{\bullet }{O}\left(g\right)+O\left(g\right)\to \stackrel{\bullet }{C}l\left(g\right)+O_2\left(g\right)$

Q. What is Ozone layer? Explain the effects of the depletion of ozone layer.

Q. Of the following, which is a greenhouse gas?

1. Nitrogen dioxide
2. Sulphur dioxide
3. Carbon dioxide
4. Carbon monoxide

Q. Can I say that every electron withdrawing group is electrophilic??

Q.

Assertion (A): Use of Chlorofluorocarbons (CFC’s) is hazardous to environment. Reason (R): CFC’s are very reactive, flammable and toxic gases.

1. Both A and R are correct and R is the correct explanation of A.

2. A is not correct but R is correct.

3. A is correct but R are not correct.

4. Both A and R are correct but R is not the correct explanation of A.

Q.

Name the chemicals which are used in refrigerators and air conditioners and damage the ozone layer when released in the air.

Q.

The major factor in causing global warming is

1. Increase in oxygen concentration in atmosphere

2. Decrease in carbon dioxide concentration in atmosphere

3. Increase in carbon dioxide concentration in atmosphere

4. Decrease in atmospheric nitrogen

Q. Which of the following is incorrect?

1. Chlorofluorocarbons are responsible for ozone layer depletion
2. Greenhouse effect is responsible for global warming
3. Ozone layer does not permit infrared radiation from the sun to reach the earth
4. Acid rains is mostly because of oxides of nitrogen and sulphur

Q. The result of ozone hole is

1. Acid rain
2. Global warming
3. Green house effect
4. UV radiations reach the surface of earth

Q. What is meant by depletion of ozone layers ? What are its causes?

Q. Which of the following chemicals is responsible for the depletion of ozone layer in the atmosphere?

1. Sulphur dioxide
2. Chlorofluorocarbons
3. Carbon dioxide
4. Nitrous oxide