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Answer: Lower A has lower boiling point so it is being more volatile and has high vapour pressure at 80 0 C. Becausevapour pressure has an inverse relation with boiling point.

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Solutions

Short Answer Type

201. How is osmotic pressure related to the concentration of the solution?

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202. What are azeotropic solutions?

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203. Write the mathematical expression relating the molality and the relative lowering of vapour pressure for a dilute solution.

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204. Define osmatic pressure.

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205. State Raoult’s layer for a binary solution containing volatile components.

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206. Two liquids A and B boil at 145⁰C and 190⁰C respectively. Which of them has higher vapour pressure at 90⁰C.

Answer:

Lower A has lower boiling point so it is being more volatile and has high vapour pressure at 80⁰ C. Becausevapour pressure has an inverse relation with boiling point.

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207. Of 0.1 molal solutions of glucose and NaCl respectively which one will have a higher boiling point?

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208. Give reason when 30 ml of ethyl alcohol an 30 ml of water are mixed, the volume of resulting solution is more than 60 ml.

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209. Draw a suitable labelled diagram to express the relationships for ideal solutions of A and B between vapour pressures and mole-fractions of components at constant temperature.

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