Q. The correct molecular representation of W(Cp)2(CO)2 is (Cp = cyclopentadienyl) (A) [W(h1–Cp)(h3–Cp)(CO)2] (B) [W(h1–Cp)(h5–Cp)(CO)2] (C) [W(h3–Cp)(h5–Cp)(CO)2] (D) [W(h5–Cp)2(CO)2] Ans: [W(η3 – Cp)(η5 – Cp)(CO)2]
The correct molecular representation of W(Cp)2(CO)2 is Read More »
Q. The product obtained in the reaction of Mn2(CO)10 with Br2 is (A) Mn(CO)5Br (B) Mn2(CO)8Br2 (C) Mn(CO)4Br2 (D) Mn2(CO)9Br Ans: Mn(CO)5Br The process of Bromination or Halogenation of Mn2(CO)10 with the scission of Mn- Mn results in the formation of Manganese pentacarbonyl bromide. Mn2(CO)10 is also known as the Dimanganese dicarbonyl compound.
The product obtained in the reaction of Mn2(CO)10 with Br2 is Read More »
Q. In the EPR spectrum of a methyl radical, the number of lines and their relative intensities, respectively, are (A) 1 and 1 (B) 3 and 1:2:1 (C) 4 and 1:2:2:1 (D) 4 and 1:3:3:1 Ans: 4 and 1 ∶ 3 ∶ 3 ∶ 1
Q. Following are the examples of silicate minerals Zircon, ZrSiO4 Beryl, Be3Al2Si6O18 Pyrophyllite, Al2(OH)2[(Si2O5)2] I II III The correct structural description of the minerals is (A) I – Ortho silicate, II – Cyclic silicate and III – Sheet silicate (B) I – Ortho silicate, II – Sheet silicate and III – Cyclic silicate (C) I –
Q. Among the following compounds, a normal spinel is (A) MgFe2O4 (B) ZnFe2O4 (C) CoFe2O4 (D) CuFe2O4 Ans: ZnFe2O4 Solution: A spinel compound is made up of eight FCC unit cells with a 2x2x2 oxygen ion configuration. According to the spaces occupied by the cations in the structure, they can be classified into two types-
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Q. The experimentally observed magnetic moment values, which match well with the spin-only values for the pair of aqueous ions is (Atomic number: Cr = 24, Co = 27, Gd = 64, Tb = 65, Dy = 66 and Lu = 71) (A) Cr(III) and Gd(III) (B) Co(II) and Gd (III) (C) Cr(III) and Dy(III)
Q. Gas phase bond length and dipole moment of a compound (MX) is 3 Å and 10.8 D, respectively. The ionic character in gas phase MX is _________________%. (Round off to one decimal place) (1D = 3.336 × 10–30 C m) Solution: To determine the Ionic character of a given compound, Dipole moment is necessary to
Q. In a 400 MHz 1H NMR spectrometer, a proton resonates at 1560 Hz higher than that of tetramethylsilane. The chemical shift value of this proton is___________ppm. (Round off to one decimal place) (Chemical shift of tetramethylsilane is fixed at zero ppm) Solution: The chemical shift of Nuclear Magnetic Resonance Spectroscopy is the relative resonant
Q. Consider a system of three identical and distinguishable non-interacting particles and three available nondegenerate single particle energy levels having energies 0, e and 2e. The system is in contact with a heat bath of temperature T K. A total energy of 2ɛ is shared by these three particles. The number of ways the particles
Q. Consider a two-state system at thermal equilibrium having energies 0 and 2kBT for which the degeneracies are 1 and 2, respectively. The value of the partition function at the same absolute temperature T is ______. (Round off to two decimal places) (kB is the Boltzmann constant) Solution: General formula is q = Ʃ gi e-Ei / KT, For
