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GATE 2015 : Life Sciences [Section H]

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GATE 2015 CHEMISTRY (COMPULSORY) XL-H H: CHEMISTRY (COMPULSORY) Q. 1 Q. 5 carry one mark each. Q.1 The molecule having net non-zero dipole moment is (A) CCl4 Q.2 (B) NF3 (C) CO2 (D) BCl3 The Diels-Alder adduct from the reaction between cyclopentadiene and benzyne is (A) (B) (C) (D) Q.3 The number of possible enantiomeric pair(s) in HOOC CH(OH) CH(OH) COOH is________ Q.4 For the electrochemical reaction, Cu (aq) + Zn(s) 2+ 2+ Cu(s) + Zn (aq) 37 the equilibrium constant at 25 oC is 1.7 10 . The change in standard Gibbs free energy ( Go) for this reaction at that temperature will be ________ kJ mol 1 (up to one decimal place). (Given: R = 8.314 JK 1mol 1) Q.5 Among the following diagrams, the one that correctly describes a zero order reaction (X product) is (Given: [X]o = initial concentration of reactant X; [X] = concentration of reactant X at time t and t1/2 = half-life period of reactant X) (A) (B) t1/2 1/[X] t (D) (C) t1/2 t1/2 1/[X]o XL-H [X]o [X]o 1/3 GATE 2015 CHEMISTRY (COMPULSORY) XL-H Q. 6 Q. 15 carry two marks each. Q.6 If the radius of first Bohr orbit is 0.53 , then the radius of the third Bohr orbit is (A) 2.12 (B) 4.77 (C) 1.59 (D) 3.18 Q.7 If 50 mL of 0.02 M HCl is added to 950 mL of H2O, then the pH of the final solution will be________ Q.8 Stability of [CrCl6] (X), [MnCl6] (Y) and [FeCl6] (Z) follows the order (Given: Atomic numbers of Cr = 24, Mn = 25 and Fe = 26) 3 (A) X > Y > Z Q.9 (B) X < Y < Z 3 (C) Y < X < Z (D) X < Y = Z Among the following pairs, the paramagnetic and diamagnetic species, respectively, are (A) CO and O2 Q.10 3 (B) NO and CO (C) O22 and CO + (D) NO and O2 In compounds K4[Fe(CN)6] (P) and Fe(CO)5 (Q), the iron metal centre is bonded to (A) C of CN in P and C of CO in Q (B) N of CN in P and C of CO in Q (C) C of CN in P and O of CO in Q (D) N of CN in P and O of CO in Q Q.11 Among the following reactions, the one that produces achiral alcohol (after hydrolysis) is O (A) + H3C CH3CH2MgBr + CH3CH2MgBr H O (B) H3C Ph O (C) H3C OEt + CH3CH2MgBr O (D) XL-H + H3 C CH3 CH3CH2MgBr 2/3 GATE 2015 Q.12 CHEMISTRY (COMPULSORY) XL-H The major product from the following reaction is R 1) SO3, H2SO4 2) HNO3, H2SO4 3) H , H2O, heat R = tert-Butyl (B) (A) (C) R (D) R R R NO2 NO2 SO3H Q.13 NO2 NO2 SO3H The order of resonance energy for the following molecules is N H (1) S O (2) (3) (4) (A) (1) > (3) > (2) > (4) (B) (1) > (3) > (4) > (2) (C) (1) > (4) > (2) > (3) (D) (1) > (4) > (3) > (2) Q.14 The molar enthalpy of vaporization for a liquid (normal boiling point = 78.3 oC) is 39 kJ mol 1. If the liquid has to boil at 25 oC, the pressure must be reduced to ________Torr (up to one decimal place). (Given: R = 8.314 JK 1mol 1; 1 atm = 760 Torr) Q.15 For the process, H2O(l) (A) Ssystem = 0 H2O(s) at 0 oC and 1 atm, the correct statement is (B) Stotal > 0 (C) Stotal = 0 (D) Stotal < 0 END OF THE QUESTION PAPER XL-H 3/3

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