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Short Answer Type

51. Define Raoult’s law?

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52. Why is the osmotic pressure measurement preferred for determining molecular mass of proteins?

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53. Why does the boiling point of a solvent increase by the presence of a solute in it?

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54. A deci-molar solution of K₄ [Fe(CN)₆] is 50% dissociated at 300 K. Calculate the osmotic pressure of solution (R = 0.082)/L atm K^–1)?

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55. Why is osmotic pressure considered a colligative property?

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56. Why is an increase in temperature observed on mixing chloroform with acetone?

Answer:

When chloroform is added to acetone there are new forces of attraction due to hydrogen bonding between acetone and chloroform.
ΔH_mix is negtive because energy is released due to increase in the attractive forces, therefore dissolution is the exothermic process . hence temperature is increases.