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Question
Which of the following units is useful in relating concentration of solution with its vapour pressure?
Options
Mole fraction
Parts per million
Mass percentage
Molality
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Solution
Mole fraction
Explanation:
Mole fraction is useful in’relating vapour pressure with concentration of solution. According to Raoult’s law, the partial vapour pressure of each component in the solution is directly proportional to its mole fraction.
A is one component.
`P_A oo x_A, x_A = (n_A)/(n_A + n_B)`
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M (Molarity)
Match List-I with List-II:
| List-I | List-II |
| A. ppm | I. molL-¹ |
| B. Molarity | II. No units |
| C. Molality | III. Independent of temperature |
| D. Mole fraction | IV. Very dilute solutions |
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