Title K-2718 (Chemical Sciences) (Paper-II).pdf ✅

Paper II 3 K-2718 *K2718* Total Number of Pages : 16 9. N-methyl imidazole coordinated iron (II) – picket fence porphyrin was employed as a model compound for the active site of (A) rubredoxin (B) cytochromes (C) peroxidase (D) myoglobin 10. The functions of transferrin, cytochrome and nitrogenase respectively are (A) iron storage, electron transfer and nitrogen fixation (B) iron transport, oxygen storage and nitrogen fixation (C) iron storage, electron transfer and N2 H4 fixation (D) iron transfer, electron transfer and nitrogen fixation 11. A molecule shows two absorption peaks (13C) at 870 and 975 Hz in a magnetic field of 3T. The corresponding chemical shifts in ppm are   Magnetogyric ratio for 13C = 6.7263×107 rad T–1s–1 ; for 13 1 2 C =   . (A) 277.1 and 310.5 ppm (B) 13.6 and 15.2 ppm (C) 27.1 and 30.4 ppm (D) 32.1 and 35.8 ppm 12. The order of carbonyl stretching frequency in the IR spectra of acetone, benzamide and acetic anhydride is (A) Acetic anhydride > acetone > benzamide (B) Acetone > benzamide > acetic anhydride (C) Benzamide > acetone > acetic anhydride (D) Acetic anhydride > benzamide > acetone 13. The 13C NMR spectrum of CDCl3 consists of (A) a singlet (B) a doublet of 1 : 1 intensity (C) a triplet of 1 : 2 : 1 intensity (D) a triplet of 1 : 1 : 1 intensity 14. Choose the correct statements about CuI, AuCl2 and [Au(CN)2 ] – from the following : i. CuI is white powder and AuCl2 is unstable ii. Both CuI and [Au(CN)2 ] – are diamagnetic iii. Both AuCl2 and [Au(CN)2 ] – are unstable iv. CuI is diamagnetic but [Au(CN)2 ] – is paramagnetic (A) i and iii (B) ii and iii (C) i and ii (D) i and iv 15. The absorption spectrum of [Ti(H2 O)6 ] 3+ shows a broad band with a shoulder because (A) The ground state of [Ti(H2 O)6 ] 3+ is Jahn-Teller distorted (B) Under UV light, [Ti(H2 O)6 ] 3+ is reduced to [Ti(H2 O)6 ] 2+ (C) The excited state of [Ti(H2 O)6 ] 3+ undergoes Jahn-Teller distortion (D) [Ti(H2 O)6 ] 3+ is a d2 ion and hence two absorption bands are displayed 16. For the following, the correct option containing species which shows color that is NOT due to a d-d transition is : VO CrO MnO MnO 2 4 2 4 2 4 + − − − , , & (A) MnO4 and CrO 2 4 − −2 (B) VO and MnO 2 4 + − (C) CrO4 and MnO 2 4 − − (D) VO and CrO 2 4 + −2