31. Which chemical is commonly used as a coolant in refrigeration systems?
a) Ammonia
b) Freon
c) Carbon dioxide
d) Methane
32. Which petrochemical is used in the production of polystyrene?
a) Ethylene
b) Propylene
c) Styrene
d) Benzene
33. Which chemical is commonly used as a pH regulator in food and beverages?
a) Citric acid
b) Sodium bicarbonate
c) Lactic acid
d) Phosphoric acid
34. Which Indian company is the largest producer of petrochemicals in terms of revenue?
a) Reliance Industries Limited
b) Indian Oil Corporation Limited
c) Oil and Natural Gas Corporation Limited
d) Bharat Petroleum Corporation Limited
35. Which chemical is commonly used as a fuel additive in gasoline?
a) Ethanol
b) Methanol
c) Isopropyl alcohol
d) Acetone
