Question

Dry ice is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue. What is its chemical composition?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Iron oxide

Answer 1

Hint: The dry ice is formed of a naturally occurring gas which is used by plants for the production of food by the process of photosynthesis. It has a faint sharp odour and sour in taste. It is the most important gas used in the greenhouse effect related to global warming.

Complete step by step answer:
When carbon dioxide gas is compressed under high pressure and temperature 178.5 degree Celsius, it changes its gaseous form into solid form which is known as dry ice. The dry ice on experiencing high pressure gets released and the solid dry ice sublimates to form gas by skipping the middle state which is liquid. This sublimation of dry ice, gives it a smoking effect and can be used in simulation of fog.
The manufacturing of dry ice is mainly done in blocks of dry ice or in small particles. The surface of dry ice is so cold that I would not be able to touch the dry ice with bare hands. For using the dry ice, gloves are used to hold them.
Thus, the chemical composition of dry ice is carbon dioxide.

So, the correct answer is Option B.

Note: When the concentration of carbon dioxide mixed in the air exceeds above 5%, then the carbon dioxide becomes toxic for humans. Thus, any area or location where use of dry ice is taking place should be ventilated.