Living in the atmosphere of CO is dangerous because it : 

1. Combines with O₂ present inside to form CO₂

2. Reduces organic matter of tissues.

3. Combines with haemoglobin and makes it incapable to absorb oxygen.

4. Dilutes the blood.

The reaction/s involved during the formation of photochemical smog are:

\(1. \space NO_2(g) \rightarrow NO(g) + \stackrel{\cdot}{O(g)}\)

\(2. \stackrel{\cdot}{O(g)} + O_2(g) \rightarrow O_3(g)\)

\(3.\space O_3(g) + NO(g) \rightarrow NO_2(g) + O_2(g)\)

4. All of the above

The incorrect statement about carbon monoxide is-

The gas that damages the ozone layer is -

1. CFCs 

2. CO₂

3. CH₄ 

4. SO₂

Ozone is a very toxic gas and a strong oxidizing agent. It is still useful for life on earth :

1. because it traps harmful UV-rays.

2. because it balances global warming.

3. because it traps harmful X-rays.

4. because it  traps harmful $\mathrm{\gamma }$-rays.

Ozone depletion occurs in : 

1. Tropospheric pollution.

2. Stratospheric  pollution.

3. Air pollution.

4. Photochemical smog.

Acid rain occurs due to the presence of : 

1. $S{O}_2$ in the atmosphere

2. $N{H}_3$  in the atmosphere

3. $C{O}_2$  in the atmosphere

4. $N_{2}O$  in the atmosphere

Match the terms given in Column I with the compounds given in Column II.

Codes

Pollution that occurs in the lowest layer of the atmosphere is :

1. Stratosphere pollution.

2. Ozone layer pollution.

3. Air pollution.

4. Troposphere pollution.

Major component of acid rain is : 

1. ${\mathrm{HNO}}_3$ 

2. ${\mathrm{H}}_2{\mathrm{SO}}_4$

3. HCl

4. ${\mathrm{H}}_2{\mathrm{CO}}_3$