16. Which chemical is commonly used as a preservative in food and beverages?
a) Sodium benzoate
b) Citric acid
c) Ascorbic acid
d) Tartaric acid
Answer: a) Sodium benzoate
17. Which Indian state is known for its production of petrochemicals?
a) Maharashtra
b) Gujarat
c) Tamil Nadu
d) Karnataka
Answer: b) Gujarat
18. Which chemical is commonly used as a raw material for the production of plastic bottles?
a) Polyethylene terephthalate
b) Polypropylene
c) Polystyrene
d) Polyvinyl chloride
Answer: a) Polyethylene terephthalate
19. Which petrochemical is used in the production of synthetic rubber?
a) Ethylene
b) Propylene
c) Butadiene
d) Benzene
Answer: c) Butadiene
20. Which chemical is commonly used as a coolant in automobile engines?
a) Ethanol
b) Methanol
c) Glycol
d) Acetone
Answer: c) Glycol
