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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.

Answer:

Relative lowering vapour pressure and molality are related by the equaton:

$\frac{p ° - p}{p °} = \frac{m M_{A}}{1000}$
where,
m = molality of the solution
M_A = Molar mass of the solvent.

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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.

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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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210. Show graphically that freezing point of a liquid will be depressed when a non-volatile solute is dissolved in it.

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