The pollution due to oxides of sulphur gets enhanced due to the presence of : 
a. particulate matter 
b. ozone 
c. hydrocarbons 
d. hydrogen peroxide 
Choose the most appropriate answer from the options given below: 
1.  a, c, d only 
2. a, d only 
3. a , b, d only 
4. b, c, d only 

A student collected samples from two water bodies A and B in a metro city. The biochemical oxygen demand for 'A' is 3 ppm while for B is found to be 18 ppm. Which one of the following is true? 
1. Both A and B are clean 
2. Both A and B are polluted 
3. A is clean but B is polluted 
4. A is polluted but B is clean 

Match List-1 with List-II

List-I	List-II
(a). $2{\mathrm{SO}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2{\mathrm{SO}}_3\left(\mathrm{g}\right)$	(i). Acid rain
(b).  $$	(ii). Smog
(c). ${\mathrm{CaCO}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4\to$ ${\mathrm{CaSO}}_4+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$	(iii). Ozone depletion
(d). ${\mathrm{NO}}_2\left(\mathrm{g}\right)\stackrel{\mathrm{hv}}{\to }\mathrm{NO}\left(\mathrm{g}\right)+\mathrm{O}\left(\mathrm{g}\right)$	(iv). Tropospheric pollution

Choose the correct answer from the options given below:

The best measure(s) to control water pollution is/are:

The correct statement(s) regarding green chemistry is/are:

The example(s) of pesticide is/are-

1. Aldrin

2. Sodium chlorate

3. Dieldrin

4. Both (1) and (3)

The major source(s) of soil pollution is/are:

1. Industrial waste.

2. Fertilizers and pesticides.

3. Organic compost.

4. Both (1) are (2)