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question
stringclasses 9
values | choices
sequence | answer
class label 3
classes | neg_prompt
stringclasses 9
values |
|---|---|---|---|
Which one sentence explains most accurately why spin trapping is often used to detect free radical intermediates? | [
"spin trapping provides more structural information than direct detection by EPR",
"spin trapping makes it easy to quantify free radical intermediates",
"steady state concentration of free radical intermediates is often too low to enable direct detection by EPR",
"detection of spin adducts requires lower power than direct detection of radical intermediates"
]
| 3D
| Question: Which one sentence doesn't explain most accurately why spin trapping is often used to detect free radical intermediates?
Answer: spin trapping provides more structural information than direct detection by EPR |
Which of the following statements is not a reason why tetramethylsilane is used as a 1H chemical shift reference. | [
"Its 1H spectrum is a singlet.",
"Its protons are quite strongly shielded.",
"It dissolves in most organic solvents.",
"Most organic compounds do not contain silicon atoms."
]
| 3D
| Question: Which of the following statements is a reason why tetramethylsilane is used as a 1H chemical shift reference.
Answer: Its 1H spectrum is a singlet. |
Which of the following statements about nuclear binding energies is NOT true? | [
"Binding energy per nucleon reaches a maximum for 56Fe.",
"Nuclear binding energies have about the same magnitude as chemical bond energies.",
"Nuclei have slightly less mass than the sum of their component nucleons.",
"The nuclei of heavy elements have more neutrons than protons in order to provide sufficient binding energy to hold the nuclei together."
]
| 1B
| Question: Which of the following statements about nuclear binding energies is true?
Answer: The nuclei of heavy elements have more neutrons than protons in order to provide sufficient binding energy to hold the nuclei together. |
Elements with partially filled 4f or 5f orbitals include all of the following EXCEPT | [
"Cu",
"Gd",
"Eu",
"Am"
]
| 0A
| Question: Elements with partially filled 4f or 5f orbitals don't include all of the following EXCEPT
Answer: Gd |
Exact solutions of the Schrödinger equation CANNOT be obtained for a | [
"simple harmonic oscillator",
"particle in a one-dimensional box",
"rigid rotor",
"helium atom"
]
| 3D
| Question: Exact solutions of the Schrödinger equation CAN be obtained for a
Answer: helium atom |
A substance that is NOT generally considered to be a toxic pollutant in water is | [
"carbonic acid",
"a halogenated hydrocarbon",
"lead",
"mercury"
]
| 0A
| Question: A substance that is NOT generally considered to be a toxic pollutant in water isn't
Answer: a halogenated hydrocarbon |
Which of the following metal ions cannot be used as a paramagnetic quencher? | [
"Ti3+",
"Cr3+",
"Fe3+",
"Zn2+"
]
| 1B
| Question: Which of the following metal ions can be used as a paramagnetic quencher?
Answer: Zn2+ |
The amplitude of a free induction decay drops to 25% of its initial intensity after 1.0 s. Assuming exponential relaxation and Ω = 0, determine the value of T2. | [
"0.721 s",
"0.750 s",
"1.386 s",
"1.661 s"
]
| 3D
| Question: The amplitude of a free induction decay doesn't drop to 25% of its initial intensity after 1.0 s. Assuming exponential relaxation and Ω = 0, determine the value of T2.
Answer: 1.661 s |
Predict the number of lines in the EPR spectrum of a solution of dimethylnitroxide (CH3)2NO• assuming the lines do not overlap. | [
"21",
"3",
"7",
"24"
]
| 1B
| Question: Don't predict the number of lines in the EPR spectrum of a solution of dimethylnitroxide (CH3)2NO• assuming the lines do not overlap.
Answer: 3 |
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