Free Experimental Techniques in Chemistry MCQs with Answers
79 Experimental Techniques in Chemistry MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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- A. Filtration
- B. Crystallization
- C. solvent extraction
- D. Chromatography
Explanation: Filtration involves passing a mixture through a filter that allows the liquid to pass through while trapping the insoluble particles.
Correct answer: Filtration- A. Shape
- B. Phase
- C. Solvent extraction
- D. all
Explanation: Chromatography can be classified based on different mechanisms used for the separation of components in a mixture.
Correct answer: Solvent extraction- A. Melting
- B. Sublimation
- C. Decomposition
- D. Condensation
Explanation: High vapor pressure at the melting point indicates that the substance readily transitions from its solid phase to its vapor phase without…
Correct answer: Sublimation4. Branch of chemistry that deals with e complete qualitative and quantitaive analysis of a substance
- A. Stoichio chemistry
- B. Analytical chemistry
- C. Physical chemistry
- D. quantum chemistrY
Explanation: The correct option is:(c) Analytical chemistry.Explanation:Analytical chemistry focuses on the qualitative and quantitative analysis of…
Correct answer: Analytical chemistry- A. Gooch crucible
- B. Filter paper
- C. Sintered crucible
- D. All of the abovE
Explanation: The correct option, "All of the above," is accurate because applying gentle suction can enhance the filtration rate across various mediums…
Correct answer: All of the abovE- A. Filtration
- B. Sublimation
- C. (c) Crystallization
- D. Solvent extraction
Explanation: Among the options provided, (c) Crystallization is often considered a simple and efficient technique for purifying a…
Correct answer: (c) Crystallization- A. sublimation
- B. Solvent extraction
- C. vaporization
- D. crystallization
Explanation: Sublimation (Option B):Sublimation is a phase transition process where a substance transitions directly from its solid state to its…
Correct answer: sublimation- A. Reliable
- B. Efficient
- C. Rapid
- D. slow
Explanation: Repeated extraction using small portions of solvents being more Efficient (Option B):
Correct answer: Efficient- A. Filtrate, residue
- B. ) Sublimate, sublimation
- C. Drying, desiccator
- D. Separating funnel, mother liquor
Explanation: Not a related pair of terms used in analytical techniques (Option B - Sublimate, sublimation):Sublimate refers to the material that…
Correct answer: ) Sublimate, sublimation- A. Compressed
- B. Depressed
- C. Rises
- D. Lowers
Explanation: This question, like many of the 2021 PMC practice tests, is a direct line from the Punjab textbook.
Correct answer: Depressed- A. Is cooled very slowly to get large-size pores in it
- B. Is cooled at a moderated rate to get medium-sized crystals
- C. Is evaporated to get the crystals of the product
- D. Is mixed with an immiscible liquid to get the pure crystals of the product
Explanation: The hot filtered solution is cooled at a moderate rate so that medium sized crystals are formed.
Correct answer: Is cooled at a moderated rate to get medium-sized crystals- A. non-volatile or thermally unstable
- B. non-volatile or thermally stable
- C. volatile or thermally unstable
- D. volatile or thermally stable
Explanation: Solvent extraction is particularly useful when dealing with volatile or thermally unstable products because it allows for the separation…
Correct answer: volatile or thermally unstable- A. the size of paper
- B. Retention Factor
- C. temperature of the experiment
- D. size of the chromatographic tank used
Explanation: The comparative rate at which the solutes move in paper chromatography mainly depends on the retention factor, which is expressed as the…
Correct answer: Retention Factor- A. I only
- B. II only
- C. I and III
- D. II and III
- E. I, II, and III
Explanation: This setup can be used to prepare an insoluble gas but not a soluble one.
Correct answer: II and III- A. Around the thermometer
- B. In the condenser
- C. In the circulating water
- D. In the heated flask
- E. In the distillate
Explanation: Option d is correct because in a laboratory setup for distillation, vaporization takes place in the heated flask.
Correct answer: In the heated flask- A. Around the thermometer
- B. In the condenser
- C. In the circulating water
- D. In the heated flask
- E. In the distillate
Explanation: The magnesium chloride will be left behind in the heated flask since it is not volatile as the liquid boils off.
Correct answer: In the heated flask- A. Move the flask farther from the flame.
- B. Move the flask closer to the flame.
- C. Allow less air into the collar of the burner.
- D. Allow more air into the collar of the burner.
- E. The problem is in the supply of the gas, and you cannot fix it.
Explanation: One of the basic adjustments to a burner is to assure enough air is mixing with the gas to form a blue cone-shaped flame.
Correct answer: Allow more air into the collar of the burner.- A. A pinkish color will appear throughout the solution.
- B. A blue color will appear throughout the solution.
- C. There will be a temporary pinkish color that will dissipate.
- D. There will be a temporary blue color that will dissipate.
- E. There will not be a color change.
Explanation: Phenolphthalein indicator is colorless below a pH of 8.3 but is red to pink in basic solutions above this pH.
Correct answer: A pinkish color will appear throughout the solution.- A. 0.1 M
- B. 0.2 M
- C. 0.3 M
- D. 1M
- E. 2 M
Explanation: Calculate the molarity by using the formula: M acid X V acid = M base X V base 0.1 M X 30 mL = M base x 15 mL M base =0.2 M Notice that as…
Correct answer: 0.2 M- A. I only
- B. III only
- C. I and III
- D. II and III
- E. I, II, and III
Explanation: The end point is reached when the color of the indicator disappears and does not return.
Correct answer: III onlyExperimental Techniques in Chemistry MCQs: common questions
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