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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Read the Experimental Techniques in Chemistry notesFree MDCAT chapter notes with key terms79 questions · page 2 of 4
- A. 3.0 mm Hg
- B. 6.0 mm Hg
- C. 13.6 mm Hg
- D. 27.2 mm Hg
- E. 40.8 mm Hg
Explanation: The 40.8 mm of water being held up in the tube by atmospheric pressure can be changed to its equivalent height of mercury by dividing it…
Correct answer: 3.0 mm Hg- A. The rule is to add concentrated acid to water slowly.
- B. The rule is to add water to the concentrated acid slowly.
- C. Carefully replace unused or excess chemicals into their properly labeled containers from which they came.
- D. Flush eyes with water at the eyewash fountain for at least 15 minutes, and then report the accident for further help.
- E. Dispose of chemicals in the proper places and following posted procedures. Do not return them to their original containers.
Explanation: Option b, "The rule is to add water to the concentrated acid slowly," is correct because when diluting a concentrated acid, it's crucial…
Correct answer: The rule is to add water to the concentrated acid slowly.- A. Electronic gravimetric balance
- B. pH meter
- C. Spectrophotometer
- D. Computer assisted probes
- E. Galvanometer
Explanation: Option c, "Spectrophotometer," is correct because it is the instrument used in chemistry labs to measure the molarity of a colored…
Correct answer: Spectrophotometer- A. Measuring cylinder
- B. Thermometer
- C. Electronic balance
- D. Burette
Explanation: An electronic balance is used to measure mass accurately. It gives readings in grams or milligrams.
Correct answer: Electronic balance- A. To heat solutions
- B. To measure temperature
- C. To deliver accurate volumes of solution
- D. To measure mass
Explanation: A burette is used to add solution drop by drop. It helps in measuring precise volumes during titration.
Correct answer: To deliver accurate volumes of solution- A. Law of mass action
- B. The amount of solvent used
- C. Distribution law
- D. The amount of solute
Explanation: Solvent extraction is governed by the Distribution Law. This law states that a solute will distribute itself between two immiscible…
Correct answer: Distribution law- A. Filtration
- B. Distillation
- C. Evaporation
- D. Decantation
Explanation: Evaporation removes the liquid by heating. The solid remains. as residue, It is commonly used to obtain salt from salt solution.
Correct answer: Filtration- A. It separates soluble substances from insoluble ones
- B. It separates insoluble solids from liquids
- C. It separates gases from liquids
- D. It separates mixtures based on boiling points
Explanation: Filtration is used to remove solid particles from a liquid by passing the mixture through filter paper.
Correct answer: It separates insoluble solids from liquids- A. Around the thermometer
- B. In the condenser
- C. In the circulating water
- D. In the heated flask
Explanation: The behavior of a substance during distillation depends on its volatility.
Correct answer: In the condenser- 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.
Explanation: Sodium hydroxide (NaOH) is a strong base. Phenolphthalein. indicator is colorless in acidic/neutral solutions but turns a distinct pink…
Correct answer: A pinkish color will appear throughout the solution.- A. To burn a substance
- B. To separate components of a mixture
- C. To dissolve solids in liquids
- D. To change the color of a solution
Explanation: Chromatography is a method used to separate and identify different substances in a mixture based on their movement on a stationary phase.
Correct answer: To separate components of a mixture- A. To form larger, purer crystals
- B. To increase solubility
- C. To speed up evaporation
- D. To prevent crystallization
Explanation: Slow cooling allows orderly arrangement of solute particles. forming large and pure crystals.
Correct answer: To form larger, purer crystals- A. In the distillation flask
- B. Above the condenser
- C. At the mouth of the condenser
- D. In the receiver flask
Explanation: The thermometer measures the temperature of the vapors entering the condenser.
Correct answer: At the mouth of the condenser- A. The rule is to add concentrated acid to water slowly.
- B. The rule is to add water to the concentrated acid slowly.
- C. Carefully replace unused or excess chemicals into their properly labeled containers from which they came.
- D. Flush eyes with water at the eyewash fountain for at least 15 minutes, and then report the accident for further help.
- E. Dispose of chemicals in the proper places and following posted procedures. Do not return them to their original containers.
Explanation: The immediate first-aid for a chemical splash in the eyes is to flush them with a large amount of water for at least 15 minutes at an…
Correct answer: Flush eyes with water at the eyewash fountain for at least 15 minutes, and then report the accident for further help.- A. 0.08 M
- B. 0.125 M
- C. 0.2 M
- D. 0.25 M
Explanation: For neutralization, moles of NaOH = moles of HCI. Moles of NaOH = 0.1 mol/L x 0.025 L = 0.0025 mol.
Correct answer: 0.125 M- A. Beaker
- B. Measuring cylinder
- C. Pipette
- D. Burette
Explanation: A pipette provides high precision for measuring a fixed volume like 10.00 mL. unlike a beaker or measuring cylinder.
Correct answer: Pipette- A. 2.0 cm
- B. 3.2 cm
- C. 4.0 cm
- D. 8.0 cm
Explanation: Rf distance traveled by compound/distance traveled by solvent. Distance= Rf × solvent distance= 0.4 x 8.0 = 3.2 cm.
Correct answer: 3.2 cm- A. 4180 J
- B. 8360 J
- C. 10450 J
- D. 20900 J
Explanation: Heat q=m × c × ∆T = 100 × 4.18 x 20.0= 8360 J.
Correct answer: 8360 J- A. Using a larger beaker
- B. Folding the filter paper into a fluted shape
- C. Heating the mixture
- D. Adding more solvent
Explanation: Fluted filter paper increases surface area, allowing faster. filtration compared to flat folding.
Correct answer: Folding the filter paper into a fluted shape- A. 4.01 × 10⁻⁴ M
- B. 2.01 × 10⁻³ M
- C. 4.01 × 10⁻³ M
- D. 9.03 × 10⁻⁴ M
Explanation: Beer-Lambert Law: A = ε × c × l. Concentration c = A/(ε × l) = 0.602/(1.5 × 10³ × 1.0) = 4.01 × 10⁻⁴ M.
Correct answer: 4.01 × 10⁻⁴ M