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Q.

Carbondioxide is a gas at

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a

30.98oC

b

28.1oC

c

36oC

d

5oC

answer is C.

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Detailed Solution

  • The critical temperature of a substance is the temperature above which the substance cannot exist in the liquid phase, regardless of the pressure applied to it. 
  • For carbon dioxide (CO2), the critical temperature is 31.1°C (304.25 K) at a critical pressure of 73.8 atmospheres (7.39 MPa).
  • Above this temperature, CO2 behaves as a gas.
  • So, among the given answer choices, 36oC is the correct answer.
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