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Q.

CO2 is called dry ice or dricold because:

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a

it wets the surface

b

it does not melt

c

at atmospheric pressure solid CO2 changes directly into the gas and the liquid phase is not formed and does not wet the surface

d

it is gaseous in nature

answer is C.

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Detailed Solution

  • Solid CO2​ is called as dry ice, because it does not melt into liquid when heated, it changes directly into gas.
  •  This process is known as Sublimation.
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