Question

Which of the following oxides of carbon is known as dry ice?
A. Solid `CO`
B. Solid `C_(3)O_(2)`
C. Solid `CO_(2)`
D. Solid `C_(5)O_(2)`

Answer 1

Correct Answer - C
Solid `CO_(2)` is called dry ice or cardice because it sublimes directly to the vapor state (without going through the liquid state) at `-78^(@)C` under atmospheric pressure. As a result, unlike ordinary ice `[H_(2)O (s)]`, it does not wet the surface on which it is kept.