Organic Chemistry Laboratory (Midterms)

• The following examples are flammable except:

  • Ethyl Alcohol
  • Ether
  • Acetone
  • Ammonia

  Ammonia
• The following examples exhibit bright light in the conductivity apparatus except:

  • Sucrose
  • Sodium Chloride Solution
  • Hydrochloric Acid
  • Sodium Carbonate

  Sucrose
• Carbon is detected using lime water. The positive indication of the presence of carbon is the formation of:

  • Yellow Precipitate
  • Milky White Precipitate
  • Black Precipitate
  • Blue Green Precipitate

  Milky White Precipitate
• What is the chemical composition of lime water?

  • NaOH
  • KOH
  • Ca(OH)2
  • Mg(OH)2

  Ca(OH)2
• Nitrogen in organic compounds is detected by:

  • Silver Nitrate Test
  • Lead Acetate Test
  • Beilstein Test
  • Soda Lime Test

  Soda Lime Test
• What is the product formed when Urea reacts with Soda Lime?

  • Ammonium Chloride
  • Ammonium Hydroxide
  • Ammonium Nitrate
  • Ammonium Oxide

  Ammonium Hydroxide
• The main apparatus used in the Beilstein test is:

  • Silver Wire
  • Iron Nail
  • Copper Wire
  • Aluminum Wire

  Copper Wire
• The formation of the green flame in the Beilstein Test is due to:

  • CuOH
  • CuNO3
  • CuCl
  • CuO

  CuCl
• Chloroform reacts with silver nitrate and forms:

  • Yellow Precipitate
  • White Precipitate
  • Red Precipitate
  • Blue Green Precipitate

  White Precipitate
• If the test compound is Carbon Tetrabromide, what is the expected visible reaction with Silver Nitrate?

  • White Precipitate
  • Flesh or Cream
  • Yellow Precipitate
  • Red Precipitate

  Flesh or Cream
• What is the visible result when Butyl Alcohol is mixed with Ferrox paper?

  • Reddish Violet Ferrox Paper
  • Black Color
  • Orange Color
  • No reaction

  Reddish Violet Ferrox Paper
• If the tested organic compound is Naphthalene, what is the visible reaction with Ferrox paper?

  • Reddish Violet Ferrox Paper
  • Red Orange Color
  • Brown Color
  • No reaction

  No reaction
• The test result for the presence of Sulfur in an organic compound is:

  • Silver Nitrate Test
  • Soda Lime Test
  • Lead Acetate Test
  • Lime Water Test

  Lead Acetate Test
• The positive indication of the presence of Sulfur in organic compounds with the test reagent used:

  • Brownish Black Precipitate
  • Red Precipitate
  • Blue Precipitate
  • Orange Precipitate

  Brownish Black Precipitate
• What is the purpose of Recrystallization?

  • To purify organic compounds
  • To dissolve crystals
  • Continuous process of crystallization
  • To clean crystallizers

  To purify organic compounds
• How does temperature affect nucleation?

  • When temperature increases the nucleation decreases
  • When temperature increases the nucleation increases
  • Nucleation is not dependent on temperature
  • When temperature increases the nucleation increases and then decreases

  When temperature increases the nucleation decreases
• Which of the following purification methods involves heating the compound and allowing it to go directly from the solid phase to the gas phase, followed by condensation of the pure compound back to a solid upon cooling?

  • Recrystallization
  • Chromatography
  • Distillation
  • Sublimation

  Sublimation
• Which of the following characteristics is vital when choosing a good solvent for a recrystallization?

  • The impurities must crystallize out of the solvent upon cooling to room temperature
  • The compound of interest should be soluble in the solvent at high temperatures, but insoluble at room temperature.
  • The compound of interest must be insoluble in the solvent at all temperature ranges
  • The impurities must be insoluble in the solvent at high temperatures.

  The compound of interest should be soluble in the solvent at high temperatures, but insoluble at room temperature.
• What is the best method for the separation of Naphthalene and Benzoic Acid from their mixture?

  • Sublimation
  • Recrystallization
  • Chromatography
  • Extraction

  Sublimation
• Carbon and Hydrogen are detected by heating the compound with which of the following?

  • Copper (II) Oxide
  • Copper (I) Oxide
  • Iron (II) Oxide
  • Iron (III) Oxide

  Copper (II) Oxide
• Which compound gets precipitated in the detection of Carbon and Hydrogen?

  • Copper
  • Carbon Dioxide
  • Calcium Carbonate
  • Copper Sulfate

  Calcium Carbonate
• What is the color of the precipitate obtained in the test for Sulfur?

  • White
  • Black
  • Violet
  • Blue

  Black
• Sugar and common salt can be separated with the help of:

  • Sublimation
  • Distillation
  • Recrystallization from solution in Ethanol
  • Chromatography

  Recrystallization from solution in Ethanol
• An impure sample of Camphor, contaminated with sand, can be purified with which of the following techniques?

  • Sublimation
  • Recrystallization
  • Chromatography
  • Steam Distillation

  Sublimation
• Identify the wrong statement in the context of crystallization

  • It is an important procedure for purifying solids
  • The impurities are removed by filtering the solution
  • Crystals are separated by filtration
  • In the crystallization method, the solid is dissolved in a solvent in which it is soluble at all temperature

  In the crystallization method, the solid is dissolved in a solvent in which it is soluble at all temperature
• If the tested organic compound is Hexane, what is the visible reaction with Ferrox paper?

  • Reddish Violet Ferrox Paper
  • Red Orange Color
  • Brown Color
  • No reaction

  No Reaction
• If the tested organic compound is Benzoic Acid, what is the visible reaction with Ferrox paper?

  • Reddish Violet Ferrox Paper
  • Red Orange Color
  • Brown Color
  • No reaction

  Reddish Violet Ferrox Paper