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MCQs

Total Questions : 168 | Page 8 of 17 pages
Question 71. Elevation of boiling points occur due to
  1.    presence of impurities
  2.    a reduced pressure
  3.    a high pressure
  4.    lower rate of evaporation
 Discuss Question
Answer: Option A. -> presence of impurities
Answer: (a).presence of impurities
Question 72. Chromatography is especially useful for
  1.    foods
  2.    drugs
  3.    salt solutions
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 73. Presence of impurities in ethanol (C₂H₅OH) will cause
  1.    lower the boiling point
  2.    raise the boiling point
  3.    the boiling at an exact temperature
  4.    lower rate of evaporation
 Discuss Question
Answer: Option B. -> raise the boiling point
Answer: (b).raise the boiling point
Question 74. Distillate is a liquid that
  1.    mixes together
  2.    condenses after distillation
  3.    does not sink due to very fine particles
  4.    a substance that will not dissolve
 Discuss Question
Answer: Option B. -> condenses after distillation
Answer: (b).condenses after distillation
Question 75. Range of −5 oC to −25 oC is of
  1.    depression of freezing point of ice
  2.    latent heat of freezing
  3.    melting salted ice
  4.    melting pure ice
 Discuss Question
Answer: Option C. -> melting salted ice
Answer: (c).melting salted ice
Question 76. Crystallization, evaporation and distillation is a mean of
  1.    separating soluble substances in solution
  2.    separating insoluble substances in solutions
  3.    separating filtrate from the solution
  4.    all of these
 Discuss Question
Answer: Option A. -> separating soluble substances in solution
Answer: (a).separating soluble substances in solution
Question 77. Liquid-liquid miscible mixtures can be separated through
  1.    chromatography
  2.    fractional distillation
  3.    filtration
  4.    both a and b
 Discuss Question
Answer: Option D. -> both a and b
Answer: (d).both a and b
Question 78. Diazo reagent is used as a locating agent in chromatography of
  1.    picric acids
  2.    benzoic acids
  3.    phenolic acids
  4.    salicylic acid
 Discuss Question
Answer: Option C. -> phenolic acids
Answer: (c).phenolic acids
Question 79. Fractional distillation can
  1.    not separate liquids whose boiling points are close
  2.    separate liquids whose boiling points are close
  3.    separate liquids whose boiling points are very high
  4.    all of these
 Discuss Question
Answer: Option B. -> separate liquids whose boiling points are close
Answer: (b).separate liquids whose boiling points are close
Question 80. In fractional distillation, a large surface area for condensation is provided through
  1.    a thermometer
  2.    water bath
  3.    a fractionating column
  4.    reflux condenser
 Discuss Question
Answer: Option C. -> a fractionating column
Answer: (c).a fractionating column

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