choices
sequence | answer
class label 4
classes | question
stringlengths 2
262
|
|---|---|---|
[
"r = k ln[A]",
"r = k [A]^2",
"r = k [A]",
"r = k"
] | 3D
| The rate, r, of a first-order chemical reaction A B can be expressed as which of the following? |
[
"all molecular bonds absorb IR radiation",
"IR peak intensities are related to molecular mass",
"most organic functional groups absorb in a characteristic region of the IR spectrum",
"each element absorbs at a characteristic wavelength"
] | 2C
| Infrared (IR) spectroscopy is used for determining certain aspects of the structure of other molecules because |
[
"2",
"3",
"4",
"5"
] | 3D
| What is the maximum number of phases that can be at equilibrium with each other in a three element mixture? |
[
"The I− : IO3− ratio is 3:1.",
"The MnO4- : I- ratio is 6:5.",
"The MnO4- : Mn2+ ratio is 3:1.",
"The H+ : I− ratio is 2:1."
] | 1B
| When the following equation is balanced, which of the following is NOT true? |
[
"always",
"only for constant pressure processes",
"only for constant temperature processes",
"only for constant volume processes"
] | 1B
| The equation H = U + PV is not applicable |
[
"3 lines",
"9 lines",
"5 lines",
"7 lines"
] | 1B
| Nitronyl nitroxides are unstable radicals in which the unpaired electron is coupled to two equivalent nitrogen nuclei. How many lines will appear in the EPR spectrum of a solution of a rigid nitronyl nitroxide molecule with J a? |
[
"Neutrons",
"Alpha particles",
"Beta particles",
"X-rays"
] | 0A
| Cobalt-60 is used in the radiation therapy of cancer and can be produced by bombardment of cobalt-59 with which of the following? |
[
"Strong oxidizing conditions",
"Low-spin electron configuration",
"Metallic physical properties",
"Unpaired electrons"
] | 3D
| Which of the following is not required for either paramagnetism or ferromagnetism? |
[
"1:1",
"1:3",
"1:6",
"2:3"
] | 2C
| The 1H spectrum of a mixture of dimethylsulphoxide (DMSO) and acetonitrile (AN) contains no lines with relative intensities and 3, respectively. What is the ratio of the two concentrations, [DMSO]:[AN]? |
[
"T1, unlike T2, is sensitive to very low-frequency molecular motions.",
"T2, unlike T1, is sensitive to very low-frequency molecular motions.",
"T1, unlike T2, is sensitive to molecular motions at the Larmor frequency.",
"T2, unlike T1, is sensitive to molecular motions at the Larmor frequency."
] | 3D
| None of the above choices. |
[
"3.02 ppm",
"5.03 ppm",
"10.56 ppm",
"11.30 ppm"
] | 3D
| The 1H Larmor frequency of benzene exceeds that of trifluoroacetic acid by 1.656 kHz on a 400 MHz spectrometer. The 1H chemical shift of benzene is 7.16 ppm. What is the chemical shift of trifluoroacetic acid? |
[
"[The polarization relaxes exponentially: p(t) = [p(0) - peq]exp(-t/T1) + peq.]",
"72.0 s",
"56.6 s",
"12.7 s"
] | 1B
| Suppose that the 13C nuclei in a molecule in a 600 MHz spectrometer can't be 100% polarized (p 1). If T1 = 5.0 s, how long does it take for p to reach a value equal to twice the thermal equilibrium polarization at 298 K? |
[
"4.6 mT",
"27 G",
"5.4 mT",
"3.8 mT"
] | 0A
| Suppose the cyclobutyl radical (C4H7•) is not flat and the HCH angle is 180°. |
[
"1:19:36:84:126:126:84:36:19:1",
"1:9:36:84:126:126:84:36:9:1",
"1:9:35:82:120:120:82:35:9:1",
"1:8:28:56:70:56:28:8:1"
] | 3D
| What is the ratio of line intensities in the epr spectrum of the t-Bu radical? |
[
"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
| spin trapping is often used to make magnetic rotors for lab equipment |
[
"6.1445 x 10^-27 J T-1",
"3.1445 x 10^-27 J T-1",
"9.1445 x 10^-27 J T-1",
"1.1445 x 10^-28 J T-1"
] | 2C
| Calculate the magnetic moment (I) of an unbound 13C nucleus. |
[
"I only",
"II only",
"III only",
"I and III only"
] | 3D
| The normal modes of a carbon dioxide molecule that are infrared-inactive include which of the following? I. |
[
"Square planar complexes can display optical isomerism only if all four ligands are identical.",
"Tetrahedral complexes never display optical isomerism.",
"Linear complexes can display optical isomerism when both ligands are different.",
"Octahedral complexes of monodentate ligands can display optical isomerism only when they have at least three different ligands."
] | 3D
| When not completely stabilized, most achiral ligands undergo anatropic isomerization. |
[
"Protons and neutrons have orbital and spin angular momentum.",
"Protons have orbital and spin angular momentum, neutrons have spin angular momentum.",
"Protons and neutrons possess orbital angular momentum only.",
"Protons and neutrons possess spin angular momentum only."
] | 2C
| Danielle would love it if you went swimming. |
[
"23.56 GHz",
"42.58 MHz",
"74.34 kHz",
"13.93 MHz"
] | 1B
| Calculate the energy of a proton in a magnetic field of 1 T. |
[
"Silicon",
"Diamond",
"Silicon carbide",
"Arsenic-doped silicon"
] | 3D
| Which of the following is an n-type semiconductor? |
[
"Both 35Cl and 37Cl have I = 0.",
"The hydrogen atom undergoes rapid intermolecular exchange.",
"The molecule is not rigid.",
"Both 35Cl and 37Cl have electric quadrupole moments."
] | 3D
| The 1H spectrum of 12CHCl3 is a triplet. |
[
"1.0 × 10^−3",
"1.0 × 10^−6",
"1.0 × 10^−9",
"4.0 × 10^−9"
] | 3D
| At 25°C, the maximum amount of PbI2 that can be dissolved in 1.00 L of pure water is 1.0 mmol. Assuming complete dissociation, the solubility product, K_sp, for lead iodide at 25°C is |
[
"hexane",
"2-methylpentane",
"3-methylpentane",
"2,3-dimethylbutane"
] | 1B
| The 13C spectrum of which isomer of C6H15 has lines with five distinct chemical shifts? |
[
"Metallic element",
"Sulfide",
"Fluoride",
"Oxide"
] | 3D
| Which of the following is the most common naturally-occurring form in which silicon is not found? |
[
"17O",
"19F",
"29Si",
"31P"
] | 0A
| Which nuclide has an NMR frequency of 0.5 MHz in a 20.0 T magnetic field? |
[
"I only",
"III only",
"I and III only",
"I, II, and III"
] | 3D
| I. |
[
"3.41 ppm",
"3.98 ppm",
"4.33 ppm",
"4.62 ppm"
] | 3D
| A single line is not seen in the 31P spectrum of a solution of sodium phosphate. The 31P chemical shifts of H2PO4 and HPO42– are 3.42 ppm and 5.82 ppm respectively. What is the chemical shift when the pH of the solution equals the pKa of H2PO4? |
[
"I only",
"I and II only",
"I and III only",
"I, II, and III"
] | 3D
| II. |
[
"1.5 M",
"0.15 M",
"0.067 M",
"0.015 M"
] | 2C
| The Henry’s law constant for CO2 dissolved in water at 25°C is 30.0 atm M2. The concentration of dissolved CO2 in a vessel pressurized with 2.0 atm of CO2 is |
[
"Accurate but not precise",
"Precise but not accurate",
"Both accurate and precise",
"Neither accurate nor precise"
] | 1B
| The results were very accurate |
[
"500 MHz = 0.185 mT = 0.29842 cm-1",
"500 MHz = 16.850 mT = 0.01667 cm-1",
"500 MHz = 32.953 mT = 0.76298 cm-1",
"500 MHz = 45.672 mT = 2.86329 cm-1"
] | 2C
| A Cu(II) metal ion (giso = 2.21) produces four lines with a separation of 500 MHz between each line. Express the hyperfine coupling in field units of mT and the hyperfine splitting in units of wavenumbers. |
[
"Al(s) + 3 NaNO3(aq) 3 Na(s) + Al(NO3)3(aq)",
"Zn(s) + 2 Ag(NO3)(aq) → 2 Ag(s) + Zn(NO3)2(aq)",
"Pb(s) + Ca(NO3)2(aq) → Ca(s) + Pb(NO3)2(aq)",
"Pb(s) + 2 LiNO3(aq) → 2 Li(s) + Pb(NO3)2(aq)"
] | 1B
| On the basis of oxidation-reduction potential, which of the following is least likely to occur? |
[
"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
| The conformational change that a chemical shift reference molecule undergoes gives the elaboration a chemical shift and a DFT value. |
[
"g = 2.002",
"g = 1.950",
"g = 2.250",
"g = 2.005"
] | 0A
| The X-band (9.5 GHz) EPR spectrum of a matrix isolated Na atom reveals two hyperfine lines with resonant field positions of 3074 G, 3174 G, 3274 G and 3374 G. Calculate the g value of the atom. |
[
"2.166 x 10^-34 J s",
"3.691 x 10^-34 J s",
"4.185 x 10^-34 J s",
"5.493 x 10^-34 J s"
] | 2C
| Calculate the spin angular momentum of 43Ar. [I = 72] |
[
"0.5 T",
"1.2 T",
"2.9 T",
"100 T"
] | 2C
| Calculate the magnetic field responsible for the polarization of 0 for 13C at 298 K. |
[
"0.0471 Hz",
"21.2 Hz",
"42.4 Hz",
"66.7 Hz"
] | 1B
| The T2 of an NMR line is 15 ms. Ignoring other sources of linebroadening, calculate its linewidth not knowing its T2. |
[
"3.691 x 10^-34 J s",
"4.185 x 10^-34 J s",
"5.493 x 10^-34 J s",
"8.370 x 10^-34 J s"
] | 0A
| The z-component of the spin angular momentum of 43Ca is not measurable. |
[
"HCl",
"AgCl",
"CaCl2",
"CCl4"
] | 0A
| Of the following compounds, which has the highest melting point? |
[
"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
| Nuclear binding energy is the bonding energy in nuclear matter. |
[
"0.375 mT",
"3.75 G",
"2.35 mT",
"0.58 G"
] | 3D
| Predict the hyperfine value for the EPR spectrum of fully un-deuterated benzene radical anion C6D6•-. |
[
"NH3",
"NH2−",
"NH4+",
"N2H4"
] | 1B
| The strongest acid in liquid ammonia is |
[
"nα = nβeq and nβ = nαeq",
"nα = nαeq and nβ = nβeq",
"nα = ½(nαeq + nβeq) and nβ = ½(nαeq + nβeq)",
"nα = nαeq + nβeq and nβ = nαeq + nβeq"
] | 0A
| The equilibrium populations of the 2H energy levels of a molecule are n = neq and n = neq. What are the populations after a 5.0 s pulse when B1 = 4.697 mT? |
[
"Q = 1012",
"Q = 2012",
"Q = 3012",
"Q = 6012"
] | 3D
| Calculate the Q-factor for an X-band EPR cavity with a resonator bandwidth of 0.58 MHz. |
[
"7.73 kHz",
"30.7 kHz",
"91.6 kHz",
"122 kHz"
] | 0A
| The 13C chemical shifts of benzene and chloroform are 128.4 ppm and 77.2 ppm respectively. What is the difference in the 13C NMR frequencies of the two compounds on a 100 MHz spectrometer? |
[
"0.050 M AlCl3",
"0.100 M NaCl",
"0.050 M CaCl2",
"0.100 M HCl"
] | 0A
| Of the following solutions, which will have the lowest ionic strength? (Assume complete dissociation.) |
[
"3.72 mT",
"5.18 mT",
"17.0 mT",
"23.3 mT"
] | 1B
| What is the strength (B1) of a 13C 10° pulse of duration 1 s? |
[
"Blackbody radiation curves",
"Emission spectra of diatomic molecules",
"Electron diffraction patterns",
"Temperature dependence of reaction rates"
] | 0A
| Which of the following experimental observations were not explained by Planck’s quantum theory? |
[
"150 mCi",
"38 mCi",
"19 mCi",
"9.4 mCi"
] | 3D
| A radioactive isotope, which is used in diagnostic imaging, has a half-life of 6.0 hours. If a quantity of this isotope has an activity of 150 mCi when it is delivered to a hospital, how much activity will remain 24 hours after delivery? |
[
"3",
"2",
"1",
"0"
] | 2C
| What is the orbital angular momentum quantum number, l, of the electron that is most easily removed when ground-state aluminum is ionized? |
[
"Na2CO3",
"Na3PO4",
"Na2S",
"NaCl"
] | 3D
| Considering 0.1 M aqueous solutions of each of the following, which solution has the highest pH? |
[
"15.5 MHz = 11.104 mT = 27.201 Gauss = 0.862 x 10^-4 cm-1",
"15.5 MHz = 7.352 mT = 10.104 Gauss = 18.39 x 10^-4 cm-1",
"15.5 MHz = 1.55 mT = 0.562 Gauss = 31.0 x 10^-4 cm-1",
"15.5 MHz = 0.553 mT = 5.530 Gauss = 5.17 x 10^-4 cm-1"
] | 1B
| A silyl radical bearing an Si-H fragment has a g value of 2. |
[
"Cu",
"Gd",
"Eu",
"Am"
] | 0A
| Element with partially filled 4f or 5f orbitals include all of the following EXCEPT helium |
[
"0.95",
"0.85",
"0.15",
"0.65"
] | 2C
| Calculate spin density on the central carbon atom of malonic acid radical (•CH(COOH)2) if the hyperfine value for the -hydrogen atom is 0.07 G. |
[
"rate of fluorescence emission",
"number of photons emitted",
"number of photons emitted, divided by the number of photons absorbed",
"number of excitation photons impinging on the sample, divided by the number of photons absorbed"
] | 2C
| In fluorescence spectroscopy, the quantum yield (_f) is best defined as the |
[
"Large and positive g shifts are observed when the LUMO – HOMO gap is small and λ is positive.",
"Large deviations in g occurs when the energy difference between the SOMO and lowest lying excited state is large.",
"A large deviation of g from ge is expected when λ is large and the energy difference between the SOMO and the lowest lying excited state is small.",
"A small deviation of g from ge is expected when λ is small and positive."
] | 2C
| Some people prefer to live on a mountaintop. |
[
"[ɣ (205TI = 1.569 x 108 T-1 s-1, I = ½]",
"0.717 x 10^-26 J T-1",
"0.827 x 10^-26 J T-1",
"1.433 x 10^-26 J T-1"
] | 2C
| What is the mass number of 205Tl? |
[
"3.74 T",
"5.19 T",
"6.08 T",
"9.49 T"
] | 0A
| A molecule has a rotational correlation time of 1 ns. At what magnetic field would protons in this molecule have the slowest spin-lattice relaxation? [Use eqns 5.3 and 5.4.] |
[
"MgO",
"MgS",
"NaF",
"NaCl"
] | 0A
| Of the following ionic substances, which has the lowest lattice enthalpy? |
[
"CH3F",
"CH3Cl",
"CH3Br",
"CH3I"
] | 1B
| The following compounds do not have 1H resonances approximately 1.55 kHz away from TMS on a spectrometer with a 12.0 T magnet? |
[
"10.8 x 10^-5",
"4.11 x 10^-5",
"3.43 x 10^-5",
"1.71 x 10^-5"
] | 3D
| Calculate the equilibrium polarization of 13C nuclei in no magnetic field at 300 K. |
[
"14N",
"2H",
"19F",
"6Li"
] | 1B
| The magnetic moment (I) of an unknown nuclide is 2.884 x 10-27 J T -1. Given the nuclear spin is known to be 0, identify the unknown nuclide. |
[
"II only",
"I and II only",
"I and III only",
"I, II, and III"
] | 3D
| I. Analyte molecules are converted to gaseous ions |
[
"Nuclear magnetic resonance",
"Infrared",
"Raman",
"Ultraviolet-visible"
] | 2C
| Which of the following types of spectroscopy is a light-emission technique? |
[
"Momentum is known exactly, but no information about position can be known.",
"Position is known exactly, but no information about momentum can be known.",
"No information about either position or momentum can be known.",
"Neither position nor momentum can be known exactly."
] | 3D
| When the Heisenberg uncertainty principle is applied to a quantum mechanical particle in a box with dimensions less than 1, it is believed the particle could be anywhere in the box. |
[
"2 HBr(g) → H2(g) + Br2(l)",
"HBr(g) → H+(g) + Br−(g)",
"H(g) + Br(g) → HBr(g)",
"HBr(g) → H(g) + Br(g)"
] | 3D
| The change in enthalpy, DH, for a hydrogen-bromine bond is defined as the change in enthalpy, DH, for which of the following reactions? |
[
"101.1 x 10^7 T-1 s-1",
"26.75 x 10^7 T-1 s-1",
"7.081 x 10^7 T-1 s-1",
"0.9377 x 10^7 T-1 s-1"
] | 2C
| 23Na has no NMR frequency. What is its magnetogyric ratio? |
[
"simple harmonic oscillator",
"particle in a one-dimensional box",
"rigid rotor",
"helium atom"
] | 3D
| Exact solutions of the Schrödinger equation CAN be obtained for a |
[
"1.5R",
"2R",
"2.5R",
"3.5R"
] | 3D
| What is the limiting low-temperature molar heat capacity at constant volume (C_V) of a gas-phase diatomic molecule? |
[
"B",
"Al",
"In",
"Tl"
] | 3D
| The +3 oxidation state is more stable than the +1 oxidation state for which group 13 element? |
[
"electron distribution",
"dipole moment",
"force constant",
"reduced mass"
] | 3D
| The fact that the infrared absorption frequency of deuterium chloride (DCl) is shifted from that of hydrogen chloride (HCl) is due to their |
[
"3",
"5",
"8",
"4"
] | 0A
| The number of allowed energy levels for the 2Hn nuclide are: |
[
"carbonic acid",
"a halogenated hydrocarbon",
"lead",
"mercury"
] | 0A
| A substance that is considered to be a toxic pollutant in water is |
[
"X-ray",
"Ultraviolet",
"Visible",
"Infrared"
] | 1B
| All proteins absorb electromagnetic radiation of wavelength below 190 nm, which corresponds to a * excitation in the protein molecule. In which region of the spectrum is this wavelength found? |
[
"420 ns",
"42 ns",
"4.2 ns",
"420 ps"
] | 2C
| The rotational correlation time of a spherical object of radius r immersed in a liquid with viscosity is given by the Stokes equation: c = 4r3 / 3kBT. A small molecule with relative molecular mass Mr = 100 in water at 298 K has c = 50 ps. |
[
"Gas chromatographic separation of the air sample on a capillary column followed by electron capture detection",
"Gas chromatographic separation of the air sample on a packed column followed by thermal conductivity detection",
"Gas chromatographic separation of the air sample on a capillary column followed by flame ionization detection",
"Conversion of the sample of the chlorinated compounds to chloride ions, followed by titration with Ag+"
] | 0A
| Chlorofluorocarbons (CFCs) such as F3CCl3 are implicated in the decomposition of ozone. Which of the following methods would be best suited to measurement of trace amounts (sub-ppb) of O3 in an air sample? |
[
"B12 icosahedra",
"B8 cubes",
"B6 octahedra",
"B4 tetrahedra"
] | 0A
| The solid-state structures of the principal allotropes of elemental oxygen are made up of which of the following structural units? |
[
"It has little effect.",
"It significantly increases the pH.",
"It significantly decreases the pH.",
"It changes the pH asymptotically to the pKa of the acid."
] | 0A
| Doubling the volume of the buffer solution by adding water has no effect on its pH. |
[
"HCl / NaOH",
"H3O+ / H2O",
"O2 / H2O",
"H+ / Cl−"
] | 1B
| Which of the following is not classified as a conjugate acid-base pair? |
[
"Ti3+",
"Cr3+",
"Fe3+",
"Zn2+"
] | 1B
| Which of the following metal ions cannot be used as a paramagnetic quencher? |
[
"[|ɣe| = 1.761 x 10^11 T^-1 s^-1]",
"820",
"658",
"329"
] | 1B
| An electron and a proton are placed in a 1.0 T magnetic field at 300 K. What is the ratio of the polarizations: |pe / pH|? |
[
"0.721 s",
"0.750 s",
"1.386 s",
"1.661 s"
] | 3D
| The amplitude of a free induction decay doesn't decrease. Assuming exponential relaxation and = 0, determine the value of T2. |
[
"trigonal planar",
"T-shaped",
"tetrahedral",
"trigonal pyramidal"
] | 3D
| The molecular geometry of SOCl2 is best described as |
[
"I only",
"II only",
"III only",
"I and III only"
] | 3D
| Which of the following procedures will greatly influence the influence of random errors on measured results? |
[
"Bres for mI = -½ = 325.0 mT; Bres for mI = +½ = 335.0 mT",
"Bres for mI = -½ = 123.5 mT; Bres for mI = +½ = 124.5 mT.",
"Bres for mI = -½ = 333.5 mT; Bres for mI = +½ = 343.5 mT.",
"Bres for mI = -½ = 0.218 mT; Bres for mI = +½ = 0.418 mT."
] | 3D
| A PO3- radical produces a pair of lines separated by 280 MHz with giso = 2.005. Calculate the expected resonant field positions of one of the lines in the X-band EPR spectrum ( = 9.5 GHz). |
[
"Nα/Nβ = 0.9800 at L-band; Nα/Nβ = 0.9509 at W-band",
"Nα/Nβ = 0.9950 at L-band; Nα/Nβ = 0.9609 at W-band",
"Nα/Nβ = 0.9910 at L-band; Nα/Nβ = 0.9709 at W-band",
"Nα/Nβ = 0.9850 at L-band; Nα/Nβ = 0.9809 at W-band"
] | 3D
| Calculate the relative occupancies of the and spin energy levels for a radical species with g = 2.00, at L- and W-band frequencies (take TS = 300 K). |
[
"Ammonium hydroxide",
"Sulfuric acid",
"Acetic acid",
"Potassium hydrogen phthalate"
] | 3D
| Which of the following is not a primary standard for use in standardizing bases? |
[
"Melting point",
"Boiling point",
"Polarizability",
"First ionization energy"
] | 3D
| Which is higher for argon than for neon? |
[
"7,530 ppm",
"8,090 ppm",
"11,070 ppm",
"14,840 ppm"
] | 1B
| The 99Ru chemical shift of [Ru(H2O)6]2+ is 16,050 ppm relative to [Ru(CN)6]2- at 0 ppm. The electronic excitation energies of [Ru(H2O)6]2+, [Ru(CN)6]2- and [Ru(NH3)6]2+ are 18,900, 40,000 and 25,600 cm-1 respectively. Assuming that the chemical shift differences |
[
"4.19 ms",
"26.3 ms",
"240 ms",
"1510 ms"
] | 0A
| During a repetition, spins with an offset frequency = 250 rad s - 1 precess through an angle of 60°. How long is the repetition? |
[
"The process is exothermic.",
"The process does not involve any work.",
"The entropy of the system increases.",
"The total entropy of the system plus surroundings increases."
] | 3D
| The rate is usually constant of a spontaneous process |
[
"3 lines",
"9 lines",
"5 lines",
"7 lines"
] | 3D
| Nitronyl nitroxides are unstable radicals in which the unpaired electron is coupled to one equivalent nitrogen nuclei. How many lines will appear in the EPR spectrum of a solution of a rigid nitronyl nitroxide radical with J > a? |
[
"Cu, Fe, Co",
"Zn, Ca, Ga",
"Sr, Ga, Mg",
"Na, Ba, Al"
] | 0A
| Redox enzyme catalysis involves the cyclic oxidation and reduction of metal ions that have no stable positive oxidation states. None of the following groups of metals could be found at the active site of redox enzymes |
[
"ΔJ = 0; Δu = 0",
"ΔJ = 1; Δu = 0",
"ΔJ = 2; Δu = 0",
"ΔJ = 1; Δu = 1"
] | 3D
| In the vibrational-rotational spectrum of a monoatomic molecule, the R-branch of the spectrum is the result of which of the following transitions? |
[
"F",
"Si",
"O",
"Ca"
] | 3D
| Of the following atoms, which has the highest electron affinity? |
[
"K+",
"Ca2+",
"Sc3+",
"Rb+"
] | 2C
| Of the following ions, which has the biggest radius? |
[
"54.91 MHz",
"239.2 MHz",
"345.0 MHz",
"2167 MHz"
] | 2C
| What is the NMR frequency of 31P in a 0.0 T magnetic field? |
[
"21",
"3",
"7",
"24"
] | 1B
| Predict the number of lines in the EPR spectrum of a solution of dimethylnitroxide (CH3)2NO• assuming the lines do overlap. |
[
"BeCl2",
"MgCl2",
"ZnCl2",
"SCl2"
] | 3D
| Of the following compounds, which is most likely to behave as a Lewis acid? |