Question

Dry ice on heating converts into:
A.Liquid
B.Do not convert
C.Gas
D.None of the above

Answer 1

Hint:The solid form of carbon dioxide is called dry ice. Dry ice is a nonpolar substance with a dipole moment of zero. Also, it is colourless and a non-inflammable solid. It is a cooling agent.

Complete answer:
Sublimation: It is a phase transition or change in the state of matter. The substance changes from solid to a gas in the process of sublimation. The substance never passes to a liquid phase.
Carbon dioxide exists as a solid state in much lower temperature than ice. Solid carbon dioxide has a very high rate of sublimation. Carbon dioxide does not enter the liquid phase as the atmospheric pressure is very low and hence it does not allow it. In addition to this, the temperature on the earth is too warm for carbon dioxide to remain in solid state. Thus, it undergoes vaporization.
Hence after heating, dry ice that is solid carbon dioxide converts into gas due to the process of sublimation.

Therefore, the correct option is C.

Note:
In order to flash-freeze food, dry ice is used. Dry ice can prevent oils and fats from becoming rancid. The use of dry ice in blast cleaning is one of its largest mechanical uses. At times, it is also beneficial as a cutting fluid. Dry ice can also be used as bait to trap mosquitoes, bed bugs and other insects. Dry ice blasting, a form of carbon dioxide cleaning, has a number of industrial applications.