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Short Answer Type

51. Define Raoult’s law?

Answer:

Raoult’s law states that "for a solution of volatile liquids the partial vapour pressure of each component in the solution is directly proportional to its mole fraction.

p1 ∝ x₁
and p1 = $p_{1}^{°}$ x₁
where $p_{1}^{°}$ is vapour pressure in the pure state

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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?

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57. What are the units of molal elevation constant?

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58. The observed boiling point of mixture of two volatile liquids is more than that calculated. What type of deviation is noticed?

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59.

Why is CaCl₂ used to remove snow on roads?

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60. Why is freezing point depressed when a non-volatile solute is added?

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