Free Spectroscopy and Analysis MCQs with Answers
47 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.
Spectroscopy studies how substances absorb, emit or interact with electromagnetic radiation. Coverage includes ultraviolet-visible absorption, infrared identification of functional groups, Beer-Lambert law, spectral interpretation and the use of spectroscopic data to identify or determine the concentration of chemical substances.
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- 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 above3. 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- A. 24.32 amu
- B. 25.32 amu
- C. 26.32 amu
- D. 27.32 amu
Explanation: To calculate the average atomic mass, we use the formula:Average atomic mass=(Abundance1×Atomic mass1)+(Abundance2×Atomic…
Correct answer: 24.32 amu- A. n → Π
- B. Π → Π
- C. 8 → 8
- D. n → 8
Explanation: This transition involves the excitation of an electron from a non-bonding orbital (n) to another orbital (8).
Correct answer: n → 8- A. Number of isotopes
- B. Mass number
- C. Relative abundace of isotopes
- D. Number of protons
Explanation: Option c is the correct answer. The height of a peak in a mass spectrum is directly proportional to the relative abundance of ions with…
Correct answer: Relative abundace of isotopes- A. Ultraviolet
- B. Infrared
- C. Radio waves
- D. Microwaves
Explanation: Infrared radiation is involved in bond vibrations. When molecules vibrate, their bonds stretch, bend, and twist.
Correct answer: Infrared- A. 3200cm-1
- B. 1200cm-1
- C. 800cm-1
- D. 1720cm-1
Explanation: This is the correct answer. The characteristic signal of the carbonyl carbon in acetone (CH3COCH3) is typically found in the region around…
Correct answer: 1720cm-1- A. Around 10-7 torr
- B. 1 torr
- C. Around 10-3 torr
- D. 10-7 torr
Explanation: Explanation:The pressure of these vapors is kept very low that 10-6 to 10-7 torr.
Correct answer: Around 10-7 torr- A. W. Roentgen
- B. De Broglie
- C. Young
- D. Michelson
Explanation: The correct answer is A. Wilhelm Conrad Roentgen discovered X-rays on November 8, 1895, while experimenting with cathode-ray tubes.
Correct answer: W. Roentgen- A. 35.5
- B. 37
- C. 4.3
- D. 78
Explanation: c) 4.3:The m/e value of 4.3 is an unusual and specific value. It is not commonly associated with any ions or fragments that would be…
Correct answer: 4.3- A. Propane
- B. Butane
- C. 2-methylpropane
- D. 2,2 - dimethylpropane
Explanation: b) Butane:Butane is a four-carbon alkane with the molecular formula C4H10.
Correct answer: Butane- A. C2H4
- B. C5H11N
- C. C7H13O
- D. C2H5F
Explanation: b) C5H11N:The molecular ion occurs at m/e 86. The empirical formula C5H11N corresponds to the compound pentylamine, which has a molecular…
Correct answer: C5H11N- A. CuCl2
- B. ZnCl2
- C. HgCl2
- D. C4H9NH4+Cl-
Explanation: d) C4H9NH4+Cl- (Tetra-n-butylammonium chloride):Tetra-n-butylammonium chloride is a quaternary ammonium salt and does not contain a metal…
Correct answer: C4H9NH4+Cl-- A. Texture of surface
- B. Hardness
- C. Passing X-rays
- D. Placing in magnetic field
Explanation: The explanation for this question will be added soon.
Correct answer: Passing X-raysSpectroscopy and Analysis MCQs: common questions
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There are 47 Spectroscopy and Analysis MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.
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