A) dry \[C{{O}_{2}}\] gas
B) solid \[S{{O}_{2}}\]
C) solid \[N{{H}_{3}}\]
D) solid \[C{{O}_{2}}\]
Correct Answer: D
Solution :
Solid \[C{{O}_{2}}\]is known as dry ice. It is obtained when compressed carbon dioxide gas (50-60 atm) is cooled. When solid \[C{{O}_{2}}\]is allowed to evaporate in air at atmospheric pressure it directly changes into gaseous state by reducing the temperature. It is used for making cold bath in laboratory, for curing local bums and for surgical operation of sores.
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