Free Spectroscopy and Analysis MCQs with Answers
24 Spectroscopy and Analysis MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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21. The breakdown of molecular ions from natural products gives important information about?
- A. Size
- B. Position
- C. Shape
- D. Structure
Explanation: The breakdown or fragmentation of molecular ions from natural products, typically obtained by techniques such as mass spectrometry, can provide important information about the structure, composition, and identity of the natural product.
Correct answer: Structure22. Chromyl Test is performed to confirm:
- A. Cl− ions
- B. SO4−2 ions
- C. PO4−3 ions
- D. Cr+3 ions
Explanation: Explanation:The chromyl chloride test is performed to detect chloride ions in the qualitative analysis. When any chloride salt for example sodium chloride (NaCl) is heated with acidified potassium dichromate, it gives fumes of chromyl chloride which is used to be in orange-red color. This confirms the presence of chloride ions in the salt.The chromyl test is not used to confirm the presence of sulfate ions (SO4-2). The chromyl test is not used to confirm the presence of phosphate ions (PO4-3). The chromyl test is also not used to confirm the presence of chromium ions (Cr+3).
Correct answer: Cl− ions23. The relative abundance of the isotopes of the elements can be determined by:
- A. Mass Spectrometry
- B. X-rays
- C. Chromatography
- D. Solvent Extraction
Explanation: A is correct as mass spectrometry is a method to differentiate between different isotopes of an element.B is incorrect as X-ray cant be used to differentiate between different isotopes of an element.C is incorrect as chromatography is used to differentiate between different solvents.D is incorrect as solvent extraction is a method to extract a soluble solute from a solution.
Correct answer: Mass Spectrometry24. The type and relative amount of each isotope in an element can be found by:
- A. R spectroscopy
- B. U.V spectroscopy
- C. Mass Spectrometry
- D. N.M.R
Explanation: Mass Spectrometry (MS) is an analytical technique used to measure the mass-to-charge ratio of ions. It provides detailed information about the molecular weight and structure of compounds
Correct answer: Mass Spectrometry