Match List-I with List-II

List-I (Water Pollutants)		List-II (Examples)
A.	Inorganic chemicals	I.	Iodine
B.	Organic chemicals	II.	Detergents
C.	Radioactive materials	III.	Parasites
D.	Pathogens	IV.	Salts

Choose the correct answer from the options given below:

The correct answer is A-IV B-II C-I D-III.

Key Points 

The correct match for List-I with List-II is as follows:

A. Inorganic chemicals - IV. Salts
B. Organic chemicals - II. Detergents
C. Radioactive materials - I. Iodine
D. Pathogens - III. Parasites

Explanation:

A. Inorganic chemicals: Inorganic chemicals refer to chemical compounds that do not contain carbon. Examples of inorganic chemicals as water pollutants can include various salts, heavy metals, and minerals that can contaminate water sources.

B. Organic chemicals: Organic chemicals are compounds that contain carbon atoms bonded with other elements such as hydrogen, oxygen, nitrogen, etc. As water pollutants, organic chemicals can include pesticides, industrial chemicals, solvents, and various synthetic compounds.

C. Radioactive materials: Radioactive materials are substances that emit radiation. While iodine itself is not a water pollutant, radioactive iodine can contaminate water sources as a result of nuclear accidents or improper disposal of radioactive waste.

D. Pathogens: Pathogens are disease-causing microorganisms, including bacteria, viruses, and parasites. Examples of waterborne pathogens can include bacteria like Escherichia coli (E. coli), viruses like hepatitis A and norovirus, and parasites like Giardia and Cryptosporidium.

Therefore, the correct answer is:

A. Inorganic chemicals - IV. Salts
B. Organic chemicals - II. Detergents
C. Radioactive materials - I. Iodine
D. Pathogens - III. Parasites