Q. The rate of the following redox reaction is slowest when X is [CoIII(NH3)5X]3+/2+ + [CrII(H2O)6]2+ → [CoII(NH3)5(H2O)]2+ + [CrIII(H2O)5X]3+/2+ (A) H2O (B) NH3 (C) Cl– (D) N3– Ans: NH3
The rate of the following redox reaction is slowest when X is Read More »
Q. In the following reaction sequence, the products P and Q are Ans: Option C
In the following reaction sequence, the products P and Q are Read More »
Q. Suppose the wave function of a one dimensional system is y = sin(kx) exp(3ikx) . In an experiment measuring the momentum of the system, one of the expected outcomes is (A) 0 (B) ћk (C) 2 ћk (D) 3 ћk Ans: 2 ћk
Suppose the wave function of a one dimensional system is Read More »
Q. Match the metalloproteins with their respective functions. P Ferritin I Electron transfer Q Rubredoxin II Acid-base catalysis R Cobalamin III Metal storage S Carbonic anhydrase IV Methyl transfer A. P – III; Q – II; R – I; S – IV B. P – III; Q – I; R – IV; S – II
Match the metalloproteins with their respective functions Read More »
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-
Among the following compounds, a normal spinel is Read More »
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)
