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MCQs

Total Questions : 168 | Page 3 of 17 pages
Question 21. A purple stain is obtained if ninhydrin spray is used to locate
  1.    peptones
  2.    protean
  3.    protein
  4.    amino acids
 Discuss Question
Answer: Option D. -> amino acids
Answer: (d).amino acids
Question 22. Pure stearic acid melts at exactly
  1.    78 °C
  2.    70 °C
  3.    below 70 °C
  4.    above 80 °C
 Discuss Question
Answer: Option B. -> 70 °C
Answer: (b).70 °C
Question 23. In order to lower melting point of ice,
  1.    hot water shall be poured
  2.    solar energy shall be waited for
  3.    salt can be spread over the ice
  4.    the ice shall be scrapped from the roads and doorways
 Discuss Question
Answer: Option C. -> salt can be spread over the ice
Answer: (c).salt can be spread over the ice
Question 24. After centrifugation when sublimate settles, clear liquid
  1.    can be allowed to rest
  2.    can be allowed to form crystals
  3.    can be decanted off
  4.    can be evaporated
 Discuss Question
Answer: Option C. -> can be decanted off
Answer: (c).can be decanted off
Question 25. In fractionating column of fractional distillation, higher in column
  1.    the temperature becomes lower
  2.    the temperature becomes higher
  3.    minimum absorption is carried out
  4.    risks of sublimation exists
 Discuss Question
Answer: Option A. -> the temperature becomes lower
Answer: (a).the temperature becomes lower
Question 26. When heating begins in miscible solutions, vapors formed will be
  1.    of liquid, lower in boiling point
  2.    of liquid, higher in boiling point
  3.    of both liquids with a higher concentration of liquid having low boiling point
  4.    collected in a gas syringe
 Discuss Question
Answer: Option C. -> of both liquids with a higher concentration of liquid having low boiling point
Answer: (c).of both liquids with a higher concentration of liquid having low boiling point
Question 27. After centrifugation, sublimate
  1.    dissolves completely
  2.    remain suspended in the liquid
  3.    settles at the bottom
  4.    depends upon the pH of sublimate
 Discuss Question
Answer: Option C. -> settles at the bottom
Answer: (c).settles at the bottom
Question 28. A pure liquid can be separated from a solution through
  1.    separating funnel
  2.    fractional distillation
  3.    centrifuging
  4.    simple distillation
 Discuss Question
Answer: Option D. -> simple distillation
Answer: (d).simple distillation
Question 29. In chromatography, different pigments can be separated through
  1.    solubility differences
  2.    diffusion differences
  3.    attraction among particles
  4.    capillary action of the chromatography paper
 Discuss Question
Answer: Option A. -> solubility differences
Answer: (a).solubility differences
Question 30. To separate components of liquid air, useful procedure is
  1.    centrifugation
  2.    separating funnel
  3.    fractional distillation
  4.    simple distillation
 Discuss Question
Answer: Option C. -> fractional distillation
Answer: (c).fractional distillation

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