Question

Which of the following is called dry ice:
A.) Solid ${ CO }_{ 2 }$
B.) Solid ${ NO }_{ 2 }$
C.) Solid ${ SO }_{ 2 }$
D.) ${ CO }_{ 2 }$

Answer 1

Hint: Dry ice is a form of a gas in solid-state. When the temperature of this gas is decreased until its freezing point, it becomes solid. Now just find what could be the possible answer.

Complete step by step answer:
“Dry ice” is the name of solid carbon dioxide. Carbon dioxide turns into dry ice when the temperature falls below -78.5 degrees C .Since it directly changes from the gaseous state to a solid-state without passing through the liquid state. It's called dry ice. Dry ice is very cold and often vapors of carbon dioxide are seen around it.
When exposed to the normal temperature outside the atmosphere under normal conditions, dry ice begins to “sublime” to form gaseous carbon dioxide.

Therefore, we can conclude that the correct answer to this question is option A.

Additional information:
Some other oxides of nitrogen -
Nitric oxide (NO) – a pollutant that is short-lived because it converts to ${ NO }_{ 2 }$ in the presence of ozone.
Nitrous oxide (${ N }_{ 2 }O$) – "laughing gas", a linear molecule, isoelectronic with ${ CO }_{ 2 }$ but with a nonsymmetric arrangement of atoms (NNO)

Note: Here we are also given an option related to Nitrogen dioxide. It is a reddish-brown gas above 21.2 $^{ 0 }$C (294.3 K) with a pungent, acrid odor, becomes a yellowish-brown liquid below 21.2 $^{ 0 }$C (294.3 K), and converts to the colorless dinitrogen tetroxide ($N_{ 2 }O_{ 4 }$) below −11.2 $^{ 0 }$C.