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51. Can equilibrium be achieved between water and its vapour in an open vessel? Explain your answer and say what happens eventually.

We know that equilibrium cannot be achieved in an open vessel. This is because in the case of an open vessel, water vapours will keep on escaping into the atmosphere and reverse process i.e. condensation of vapours back to water cannot take place. Equilibrium can be achieved only if in the system, two opposing processes take place simultaneously. Eventually, slowly and slowly, the whole of the water will change to vapours which escape out of the vessel and the vessel will become dry.

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Long Answer Type

52. A vessel has two compartments connected at the top. In one compartment (B), radioactive methyl iodide (CH₃I) is placed and in the other (A) normal methyl iodide (CH₃I) is placed. Will the vaporus over (A) and (B) become radioactive?
Will the radioactivity spread to the liquid in the compartment A? Discuss in terms of dynamic nature of the equilibrium between vapours and its liquid.

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53. A liquid is in equilibrium with its vapours in a sealed container at a fixed temperature. The volume of the container is suddenly increased.

(i) What is the initial effect of the change on the vapour pressure?

(ii) How do the rates of evaporation and condensation change pressure?

(iii) What happens when equilibrium is restored finally and what will be the Final vapour pressure?

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