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When CO(2) under high pressure is releas...

When `CO_(2)` under high pressure is released from a fire extinguisher. Particles of soloid `CO_(2)` are formed, despite the low sublimation temperature `(-77^(@)C)` of `CO_(2)` at 1.0atm it is:

A

the gas does work pushingback the atmosphere using KE of molecuels and thus lowering the temperature

B

volume of the gas is decreased rapidly hence, temperature is lowered

C

both a and b

D

none of the above

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The correct Answer is:
a
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The constant motion and high velocities of gas particles lead to some important practical consquences. One such consquences is that gases mix rapidly when they come in contact. Take the stopper off a bottle of perfume, for instance, and the odour will spread rapidly through the room as perfume molecules mix with the molecules in the air. This mixing of different gases by random molecular motion and with frequent collision is called diffusion. A similar process in which gas molecules escape without collision through a tiny hole into a vacuum is called effusion. Both the processes follow Graham's law which is mathematically put as r prop sqrt(1//d) . The average distance travelled by molecules between successive collisions is called mean free path. Answer the following questions on the basis of the above information: When CO_(2) under high pressure is released from a fire extinguisher, particles of solid CO_(2) are formed, despite the low sublimation temperature (-77^(@)C) at 1 atm because

At the sublimation temperature, for the process CO_(2)(S)toCO_(2)(g)

Answer the following questions based on the P – T phase diagram of CO_(2) : (a) CO_(2) at 1 atm pressure and temperature – 60^(@)C is compressed isothermally. Does it go through a liquid phase ? (b) What happens when CO_(2) at 4 atm pressure is cooled from room temperature at constant pressure ? (c) Describe qualitatively the changes in a given mass of solid CO_(2) at 10 atm pressure and temperature –65^(@)C as it is heated up to room temperature at constant pressure. (d) CO_(2) is heated to a temperature 70^(@)C and compressed isothermally. What changes in its properties do you expect to observe ?

If pressure becomes double at the same absolute temperature on 2L CO_(2) , then the volume of CO_(2) becomes

If the pressure and absolute temperature of 2 litres of CO_(2) are doubled the volume of CO_(2) would become

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