Which of the following is the main uses of `CO_(2)` ?

Options

A. As fire-extinguisher
B. To manufacture urea
C. To carbonate urea
D. As a refrigerant

Answer

D

Explanation

`CO_(2)` is an important industrial chemical. Each year, over `40` million tonnes is used in the United States alone. Half of this quantity is needed as a refrigerant in the form of dry ice. It is used as a coolant for preserving perishable food items such as meat, frozen foods, and ice cream. Another `25%` is used to carbonate soft drinks (coca-cola, lemonade, beer, etc.). Over `6` million tonnes per year of urea is produced:
`CO_(2) + 2NH_(3) underset("Pressure")overset(180^(@)C)rarrunderset("Ammonium carbonate")(H_(4)NCONH_(2))overset("Rearrangement")rarrH_(2)NCONH_(2)+H_(2)O`