Unit 2: Experimental Techniques in Chemistry

51. The process of heating a solution in a controlled manner to separate its components based on boiling points is known as:

a) Filtration
b) Distillation
c) Centrifugation
d) Chromatography
Answer: b) Distillation

52. The device used to accurately measure the volume of liquid dispensed is:

a) Beaker
b) Pipette
c) Test tube
d) Graduated cylinder
Answer: b) Pipette

53. Which laboratory instrument is used to measure the temperature of a solution?

a) Thermometer
b) pH meter
c) Spectrophotometer
d) Centrifuge
Answer: a) Thermometer

54. The process of removing dissolved gases from a solution by boiling it is called:

a) Distillation
b) Degassing
c) Filtration
d) Centrifugation
Answer: b) Degassing

55. The purpose of using an analytical balance is to:

a) Measure temperature
b) Measure mass with high precision
c) Mix solutions
d) Heat substances
Answer: b) Measure mass with high precision

56. The technique of separating a mixture based on the difference in the boiling points of its components is:

a) Filtration
b) Chromatography
c) Distillation
d) Centrifugation
Answer: c) Distillation

57. Which of the following methods is used to separate a mixture based on solubility differences in a solid-liquid system?

a) Filtration
b) Crystallization
c) Centrifugation
d) Distillation
Answer: b) Crystallization

58. The use of a separating funnel is most appropriate for separating:

a) Solids from liquids
b) Liquids with different boiling points
c) Two immiscible liquids
d) Gases from liquids
Answer: c) Two immiscible liquids

59. Which of the following is a method used to analyze the concentration of a solution by measuring light absorption?

a) Spectrophotometry
b) Chromatography
c) Filtration
d) Distillation
Answer: a) Spectrophotometry

60. The technique used to obtain a dry sample of a solid from a solution by allowing the solvent to evaporate slowly is known as:

a) Filtration
b) Crystallization
c) Distillation
d) Sublimation
Answer: b) Crystallization