Free Analytical Chemistry MCQs with Answers
105 Analytical 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.
Analytical chemistry identifies and measures substances using separation and instrumental methods. Chromatography is studied through stationary and mobile phases, retention and Rf values, while spectroscopy connects absorption of electromagnetic radiation with molecular structure and supports qualitative and quantitative analysis through techniques such as UV-visible and infrared spectroscopy.
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Read the Analytical Chemistry notesFree MDCAT chapter notes with key terms105 questions · page 3 of 6
- A. Student's t-test
- B. F-test
- C. Chi square test
- D. Standard deviation
Explanation: The F-test is a statistical test used to compare the variances (the square of the standard deviation) of two samples.
Correct answer: F-test- A. Student's t-test
- B. F-test
- C. Chi-square test
- D. Standard deviation
Explanation: The chi-square (χ²) test is a statistical hypothesis test used to determine if there is a significant difference between the expected…
Correct answer: Chi-square test- A. Electrons
- B. Protons
- C. Alpha particles
- D. Beta-particles
Explanation: Beta particles penetrate farther than alpha particles and protons because they are lighter and less charged.
Correct answer: Beta-particles- A. Hydrogen
- B. Nitrogen
- C. Helium
- D. Argon
Explanation: e/m is largest for the particle with the smallest mass and single positive charge.
Correct answer: Hydrogen- A. Double bond
- B. Triple bond
- C. Aromatic ring
- D. All of the above
Explanation: π → π* transitions need π electrons, which are present in double bonds, triple bonds, and aromatic systems.
Correct answer: All of the above- A. Fractional crystallization
- B. Sublimation
- C. Chemical method
- D. Extraction with solvent
Explanation: Camphor can sublime (change directly from solid to vapor) on heating.Benzoic acid remains as a solid because it does not sublimate.
Correct answer: Chemical method- A. Conductance
- B. Refractive Index
- C. Optical activity
- D. Change in volume
Explanation: Optical activity is the ability of a substance to rotate planepolarized light, typical for chiral compounds.
Correct answer: Optical activity- A. one yellow
- B. two yellow
- C. two brown
- D. two golden
Explanation: Sodium emits two yellow lines in its line spectrum, known as the D1 and D2 lines.
Correct answer: two yellow- A. Quantity of fast moving electrons
- B. Strength of electric current measured
- C. High pressure of vapors
- D. Electron gas
Explanation: Ions with a specific m/e value hit the detector and produce an electric current.
Correct answer: Strength of electric current measured- A. H2S
- B. CS2
- C. Rubeanic acid
- D. Ninhydrin
Explanation: Rubeanic acid is a specific locating agent that forms colored complexes with metals like Cu²⁺ and Ni²⁺.
Correct answer: Ninhydrin- A. 22.18 amu
- B. 21.18 amu
- C. 20.18 amu
- D. 22.20 amu
Explanation: relative atomic mass = (20 × 90.92 + 21 × 0.26 + 22 × 8.82) ÷ 100 = 20.179 ≈ 20.18
Correct answer: 20.18 amu- A. 100% same of the configuration of reactant
- B. 50% retained
- C. 50% inverted
- D. 100% opposite from configuration of reactant
Explanation: The reaction occurs with inversion of configuration. Thus, the nucleophile approaches the electrophilic carbon atom from the back and the…
Correct answer: 100% opposite from configuration of reactant- A. Diffraction
- B. Interferences
- C. Refraction
- D. Spectroscopy
Explanation: Spectroscopy is like the CSI of light! It's all about studying how light interacts with matter.
Correct answer: Spectroscopy- A. Frequency
- B. Energy
- C. Wavelength
- D. All of the above
Explanation: (a) Frequency: This is like the beat of the light wave, how fast it's waving.
Correct answer: All of the above55. X-rays are:
- A. Low velocity invisible rays
- B. High velocity invisible rays
- C. High velocity visible rays
- D. Low velocity visible rays
Explanation: X-rays are high-frequency electromagnetic radiations having wavelengths between 0.01-10 nm, way beyond the visible range that is between…
Correct answer: High velocity invisible rays- A. Wavelengths
- B. Intensities of electromagnetic radiations emitted by atoms
- C. Intensities of electromagnetic radiations absorbed by atoms
- D. All of these options
- E. Both B and C
Explanation: The correct answer is D: All of these options. Atomic spectra encompass the study of both the wavelengths and the intensities of…
Correct answer: All of these options- A. Atomic Number
- B. Atomic Mass
- C. Molecular Mass
- D. Equivalent mass
Explanation: In 1914, he observed and measured the X-ray spectra of various chemical elements using diffraction in crystals.
Correct answer: Atomic Number- A. 2
- B. 3
- C. 4
- D. None
Explanation: Ethane thiol has the formula CH3- CH2- SH so the number of peaks of proton NMR are going to be 3
Correct answer: 3- A. C = C Bond
- B. C = O Bond
- C. C ≡ N Bond
- D. O - H Bond
Explanation: The carbonyl group (C=O) exhibits a strong absorption band around 1720 cm-1 due to the stretching vibration of the double bond between the…
Correct answer: C = O Bond- A. 0.8-2.5μm
- B. 16-1000μm
- C. 2.5-16μm
- D. 400-800μm
Explanation: Here are the approximate wavelength ranges for different portions of the infrared region:Near-infrared (NIR): 0.75 μm to 1.5…
Correct answer: 16-1000μm