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MCQs

Total Questions : 168 | Page 14 of 17 pages
Question 131. If a substance decomposes when heated to its boiling point, suitable method is
  1.    simple distillation
  2.    fractional distillation
  3.    vacuum distillation
  4.    crystallization
 Discuss Question
Answer: Option C. -> vacuum distillation
Answer: (c).vacuum distillation
Question 132. Pure ice melts at exactly
  1.    −100 °C
  2.    zero °C
  3.    10 °C
  4.    20°C
 Discuss Question
Answer: Option B. -> zero °C
Answer: (b).zero °C
Question 133. Liquid-liquid immiscible mixtures can be separated through
  1.    chromatography
  2.    fractional distillation
  3.    separating funnel
  4.    vacuum distillation
 Discuss Question
Answer: Option C. -> separating funnel
Answer: (c).separating funnel
Question 134. A range of boiling point indicates,
  1.    that chromatography is not correctly done
  2.    that fractional distillation has been carried out successfully
  3.    that it has got impurities
  4.    that any impurity is absent
 Discuss Question
Answer: Option C. -> that it has got impurities
Answer: (c).that it has got impurities
Question 135. Suspensions can be successfully separated through
  1.    simple or fractional distillation
  2.    decanting and centrifugation
  3.    boiling points
  4.    chromatographs
 Discuss Question
Answer: Option B. -> decanting and centrifugation
Answer: (b).decanting and centrifugation
Question 136. An effective way of purifying liquids containing suspensions is
  1.    crystallization
  2.    decanting
  3.    centrifuging
  4.    separating funnel
 Discuss Question
Answer: Option C. -> centrifuging
Answer: (c).centrifuging
Question 137. A brine solution is
  1.    low in salts
  2.    concentrated in salts
  3.    highly concentrated in salts
  4.    contains a lot of water
 Discuss Question
Answer: Option C. -> highly concentrated in salts
Answer: (c).highly concentrated in salts
Question 138. Separating a liquid from a solution can be carried out through
  1.    simple filtration
  2.    simple distillation
  3.    chromatography
  4.    fractional distillation
 Discuss Question
Answer: Option B. -> simple distillation
Answer: (b).simple distillation
Question 139. An impure substance
  1.    lowers the boiling point
  2.    increases the boiling point
  3.    lowers the melting point
  4.    increases the melting point
 Discuss Question
Answer: Option C. -> lowers the melting point
Answer: (c).lowers the melting point
Question 140. Melting point of silicon is
  1.    410 °C
  2.    110 °C
  3.    140 °C
  4.    1410 °C
 Discuss Question
Answer: Option D. -> 1410 °C
Answer: (d).1410 °C

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