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IIT JAM 2021 : Chemistry (with Answer Keys)

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JAM 2021 CHEMISTRY - CY Paper Specific Instructions 1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are of different types. 2. Section A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four choices out of which only one choice is the correct answer. Questions Q.1 Q.30 belong to this section and carry a total of 50 marks. Q.1 Q.10 carry 1 mark each and Questions Q.11 Q.30 carry 2 marks each. 3. Section B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the four given choices. The candidate gets full credit if he/she selects all the correct answers only and no wrong answers. Questions Q.31 Q.40 belong to this section and carry 2 marks each with a total of 20 marks. 4. Section C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. No choices will be shown for these type of questions. Questions Q.41 Q.60 belong to this section and carry a total of 30 marks. Q.41 Q.50 carry 1 mark each and Questions Q.51 Q.60 carry 2 marks each. 5. In all sections, questions not attempted will result in zero mark. In Section A (MCQ), wrong answer will result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section B (MSQ), there is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in Section C (NAT) as well. 6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other electronic gadgets are NOT allowed in the examination hall. 7. The Scribble Pad will be provided for rough work. CY 1/21 JAM 2021 CHEMISTRY - CY SECTION A MULTIPLE CHOICE QUESTIONS (MCQ) Q. 1 Q.10 carry one mark each. Q.1 Q.2 Q.3 Q.4 CY The CORRECT order of pKa for the compounds I to IV in water at 298 K is (A) I > II > III > IV (B) IV > III > II > I (C) IV > II > III > I (D) I > III > II > IV For Na+, Mg2+, Al3+ and F , the CORRECT order of ionic radii is (A) Al3+ > Mg2+ > Na+ > F (B) Al3+ > Na+ > Mg2+ > F (C) F > Na+ > Mg2+ > Al3+ (D) Na+ > F > Mg2+ > Al3+ Spin-only magnetic moments (in BM) of [NiCl2(PPh3)2] and [Mn(NCS)6]4 , respectively, are (A) 0.00 and 5.92 (B) 2.83 and 1.89 (C) 0.00 and 1.89 (D) 2.83 and 5.92 Two sets of quantum numbers with the same number of radial nodes are (A) n = 3; l = 0; m l = 0 and n = 2; l = 0; m l = 0 (B) n = 3; l = 1; m l = 1 and n = 2; l = 1; m l = 0 (C) n = 3; l = 2; m l = 0 and n = 2; l = 1; m l = 0 (D) n = 3; l = 1; m l = 1 and n = 2; l = 1; m l = 0 2/21 JAM 2021 Q.5 Q.6 CY CHEMISTRY - CY The major product formed in the following reaction is (A) (B) (C) (D) The major product formed in the following reaction is (A) (B) (C) (D) 3/21 JAM 2021 Q.7 Q.8 CY CHEMISTRY - CY A compound shows 1H NMR peaks at -values (in ppm) 7.31 (2H), 7.21 (2H), 4.5 (2H) and 2.3 (3H). The structure of the compound is (A) (B) (C) (D) The major product formed in the following reaction is (A) (B) (C) (D) 4/21 JAM 2021 Q.9 Q.10 CY CHEMISTRY - CY A pure substance M has lesser density in solid state than in liquid state. The S fusion of M is +25 J K 1 mol 1. The CORRECT representative Pressure-Temperature diagram for the fusion of M is (A) (B) (C) (D) Among the following, the matrices with non-zero determinant are (A) P, Q and R (B) P, R and S (C) P, Q and S (D) Q, R and S 5/21 JAM 2021 CHEMISTRY - CY Q. 11 Q. 30 carry two marks each. Q.11 Q.12 Reaction of BCl3 with NH4Cl at 140 C produces compound P. Further, P reacts with NaBH4 to give a colorless liquid Q. The reaction of Q with H2O at 100 C produces compound R and a diatomic gas S. Among the following, the CORRECT statement is (A) P is B3N3H6 (B) R is [B(OH)NH]3 (C) Q is [BClNH]3 (D) S is Cl2 The complex that does NOT obey the 18-electron rule is (Given: Atomic numbers of Ti, Mn, Ta and Ir are 22, 25, 73 and 77, respectively) (A) [( 5-C5H5)Ti(CO)4] (B) [Mn(SnPh3)2(CO)4] (C) [( 5-C5H5)Ir(CH2)(PMe3)] Q.13 Q.14 (D) [TaCl3(PEt3)2(CHCMe3)] Hybridization of the central atoms in I3 , ClF3 and SF4, respectively, are (A) sp3d, sp2 and dsp2 (B) sp, sp3d and dsp2 (C) sp3d, sp3d and sp3d (D) sp, sp2 and sp3d Reaction of [Ni(CN)4]2 with metallic potassium in liquid ammonia at 33 C yields complex E. The geometry and magnetic behavior of E, respectively, are (A) Square planar and diamagnetic (B) Tetrahedral and diamagnetic (C) Octahedral and paramagnetic (D) Square pyramidal and paramagnetic Q.15 The decreasing order of C=C bond length in the following complexes is CY (A) II > III > IV > I (B) IV > II > III > I (C) II > IV > III > I (D) IV > II > I > III 6/21 JAM 2021 CHEMISTRY - CY Q.16 The CORRECT combination for metalloenzymes given in Column I with their catalytic reactions in Column II is Q.17 CY (A) (i) (M); (ii) (N); (iii) (K); (iv) (L) (B) (i) (N); (ii) (L); (iii) (K); (iv) (M) (C) (i) (N); (ii) (K); (iii) (L); (iv) (M) (D) (i) (M); (ii) (K); (iii) (L); (iv) (N) According to the crystal field theory, d d transition observed in [Ti(H2O)6]3+ is (A) Laporte forbidden and spin forbidden (B) Laporte allowed and spin forbidden (C) Laporte allowed and spin allowed (D) Laporte forbidden and spin allowed 7/21 JAM 2021 Q.18 CY CHEMISTRY - CY The major product formed in the following reaction sequence is (A) (B) (C) (D) 8/21 JAM 2021 Q.19 CHEMISTRY - CY The products P, Q, R and S formed in the following reactions are (A) (B) (C) (D) CY 9/21 JAM 2021 Q.20 CHEMISTRY - CY The major products E and F formed in the following reactions are (A) (B) (C) (D) CY 10/21 JAM 2021 Q.21 CHEMISTRY - CY The reaction that produces the following as a major product is (A) (B) (C) (D) Q.22 CY The major product formed in the following reaction is (A) (B) (C) (D) 11/21 JAM 2021 Q.23 Q.24 CY CHEMISTRY - CY The major product formed in the following reaction is (A) (B) (C) (D) In the following reaction, compound Q is (A) (B) (C) (D) 12/21 JAM 2021 Q.25 CHEMISTRY - CY Monochromatic X-rays having energy 2.8 10 15 J diffracted (first order) from (200) plane of a cubic crystal at an angle 8.5 . The length of unit cell in of the crystal (rounded off to one decimal place) is (Given: Planck s constant, h = 6.626 10 34 J s; c = 3.0 108 m s 1) (A) 2.4 Q.26 (B) 3.4 (C) 4.8 + For > , the value of the integral (A) (C) 0 Q.27 is (B) (D) 1 The volume correction factor for a non-ideal gas in terms of critical pressure (pc), critical molar volume (Vc), critical temperature (Tc) and gas constant (R) is (A) Q.28 2 (D) 9.8 c (B) c 2 c c 2 (C) c c c (D) 3 c c Half-life ( / ) of a chemical reaction varies with the initial concentration of reactant (Ao) as given below: Ao (mol L 1) 5 10 2 4 10 2 3 10 2 450 600 / (s) 360 The order of the reaction is (A) 0 Q.29 (B) 1 (C) 2 (D) 3 The CORRECT statement regarding the molecules BF3 and CH4 is (A) Both BF3 and CH4 are microwave active (B) Both BF3 and CH4 are infrared active (C) CH4 is microwave active and infrared inactive (D) BF3 is microwave active and infrared active CY 13/21 JAM 2021 Q.30 CHEMISTRY - CY For the consecutive reaction, is the initial concentration of X. The concentrations of X, Y and Z at time t are and , respectively. The expression for the concentration of Y at time t is (A) (C) CY 0 0 (B) (D) , 14/21 JAM 2021 CHEMISTRY - CY SECTION - B MULTIPLE SELECT QUESTIONS (MSQ) Q. 31 Q. 40 carry two marks each. Q.31 The CORRECT statement(s) about the species is (are) (A) CpMo(CO)3 and CpW(CO)3 are isoelectronic (where Cp is cyclopentadienyl) (B) CH2 and NH2 are isolobal and isoelectronic (C) BH and CH are isolobal and isoelectronic (D) CH3 and Mn(CO)5 are isolobal Q.32 Q.33 The complex(es) that show(s) Jahn-Teller distortion is (are) (A) [Co(CN)5(H2O)]3 (B) [NiF6]2 (C) [Mn(CNMe)6]2 + (D) [Co(en)2F2]+ The CORRECT statement(s) about sodium nitroprusside is (are) (A) It is a paramagnetic complex (B) Nitroprusside ion is formed in the brown ring test for nitrates (C) It is used for the detection of S2 in aqueous solution (D) It contains nitrosyl ligand as NO+ Q.34 The pigment responsible for red color in tomato has one functional group. The CORRECT statement(s) about this functional group is (are) (A) It decolorizes bromine water (B) It gives hydrazone derivative on reaction with 2,4-dinitrophenylhydrazine (C) It gets cleaved on reaction with ozone (D) It gives positive silver mirror test CY 15/21 JAM 2021 CHEMISTRY - CY Q.35 Hantzsch pyridine synthesis involves several steps. Some of those are Q.36 Q.37 (A) Aldol reaction (B) Darzens reaction (C) Mannich reaction (D) Michael addition The compound(s), which give(s) benzoic acid on oxidation with KMnO4, is (are) (A) (B) (C) (D) The products P and Q formed in the reaction are (A) (B) (C) (D) CY 16/21 JAM 2021 Q.38 Q.39 Q.40 CHEMISTRY - CY The functional group(s) in reducing sugar that tests positive with Tollen s reagent is (are) (A) Aldehyde (B) Ketone (C) Hemi-acetal (D) Acetal Among the following, the anti-aromatic compound(s) is (are) (A) (B) (C) (D) The CORRECT Maxwell relation(s) derived from the fundamental equations of thermodynamics is (are) (A) (C) CY = = (B) (D) = = 17/21 JAM 2021 CHEMISTRY - CY SECTION C NUMERICAL ANSWER TYPE (NAT) Q. 41 Q. 50 carry one mark each. Q.41 The total number of optically active isomers of dichloridobis(glycinato)cobaltate(III) ion is ______. Q.42 The total number of microstates possible for a d 8 electronic configuration is ______. Q.43 For the following fusion reaction, 4 He + 2 + + 2 + 4 1H the Q-value (energy of the reaction) in MeV (rounded off to one decimal place) is ______. (Given: Mass of 1H nucleus is 1.007825 u and mass of 4He nucleus is 4.002604 u) Q.44 MgO crystallizes as rock salt structure with unit cell length 2.12 . From electrostatic model, the calculated lattice energy in kJ mol 1 (rounded off to the nearest integer) is ______. (Given: NA = 6.022 1023 mol 1 ; Madelung constant = 1.748; 0 = 8.854 10 12 J 1 C2 m 1; charge of an electron = 1.602 10 19 C) Q.45 Calcium crystallizes in fcc lattice of unit cell length 5.56 and density 1.4848 g cm 3 . The percentage of Schottky defects (rounded off to one decimal place) in the crystal is ______. (Given: Atomic mass of Ca is 40 g mol 1; NA = 6.022 1023 mol 1) Q.46 Among the following, the total number of terpenes(terpenoids) is ______. CY 18/21 JAM 2021 CHEMISTRY - CY Q.47 A buffer solution is prepared by mixing 0.3 M NH3 and 0.1 M NH4NO3. If Kb of NH3 is 1.6 10 5 at 25 C, then the pH (rounded off to one decimal place) of the buffer solution at 25 C is ______. Q.48 The dissociation constant of a weak monoprotic acid is 1.6 10 5 and its molar conductance at infinite dilution is 360.5 10 4 mho m2 mol 1. For 0.01 M solution of this acid, the specific conductance is n 10 2 mho m 1. The value of n (rounded off to two decimal places) is ______. Q.49 Adsorption of a toxic gas on 1.0 g activated charcoal is 0.75 cm3 both at 2.5 atm, 140 K and at 30.0 atm, 280 K. The isosteric enthalpy for adsorption of the gas in kJ mol 1 (rounded off to two decimal places) is ______. (Given: R = 8.314 J K 1 mol 1 ) Q.50 If the root mean square speed of hydrogen gas at a particular temperature is 1900 m s 1, then the root mean square speed of nitrogen gas at the same temperature, in m s 1 (rounded off to the nearest integer), is ______. (Given: atomic mass of H is 1 g mol 1; atomic mass of N is 14 g mol 1) Q. 51 Q. 60 carry two marks each. Q.51 If the crystal field splitting energy of [Co(NH3)4]2 + is 5900 cm 1, then the magnitude of its crystal field stabilization energy, in kJ mol 1 (rounded off to one decimal place), is ______. Q.52 A salt mixture (1.0 g) contains 25 wt% of MgSO4 and 75 wt% of M2SO4. Aqueous solution of this salt mixture on treating with excess BaCl2 solution results in the precipitation of 1.49 g of BaSO4. The atomic mass of M in g mol 1 (rounded off to two decimal places) is ______. (Given: the atomic masses of Mg, S, O, Ba and Cl are 24.31, 32.06, 16.00, 137.33 and 35.45 g mol 1, respectively) Q.53 CY The intensity of a monochromatic visible light is reduced by 90% due to absorption on passing through a 5.0 mM solution of a compound. If the path length is 4 cm, then the molar extinction coefficient of the compound in M 1 cm 1 is ______. 19/21 JAM 2021 Q.54 CHEMISTRY - CY The surface tension ( ) of a solution, prepared by mixing 0.02 mol of an organic acid in 1 L of pure water, is represented as = log + is the surface tension of pure water, A = 0.03 N m 1, B = 50 mol 1 L and c is concentration in mol L 1. The excess concentration of the organic acid at the surface of the liquid, determined by Gibbs adsorption equation at 300 K is n 10 6 mol m 2. The value of n (rounded off to two decimal places) is ______. (Given: R = 8.314 J K 1 mol 1) Q.55 The separation of energy levels in the rotational spectrum of CO is 3.8626 cm 1. The bond length (assume it does not change during rotation) of CO in (rounded off to two decimal places) is ______. (Given: Planck s constant h = 6.626 10 34 J s; NA = 6.022 1023 mol 1; atomic mass of C is 12 g mol 1; atomic mass of O is 16 g mol 1; c = 3 108 m s 1) Q.56 A dilute solution prepared by dissolving a nonvolatile solute in one liter water shows a depression in freezing point of 0.186 K. This solute neither dissociates nor associates in water. The boiling point of the solution in K (rounded off to three decimal places) is ______. (Given: For pure water, boiling point = 373.15 K; cryoscopic constant = 1.86 K (mol kg 1) 1; ebullioscopic constant = 0.51 K (mol kg 1) 1 ) Q.57 The thermodynamic data at 298 K for the decomposition reaction of limestone at equilibrium is given below Thermodynamic quantity CaCO3(s) CaO(s) CO2(g) (kJ mol 1) 1128.8 604.0 394.4 Hf (kJ mol 1) 1206.9 635.1 393.5 The partial pressure of CO2(g) in atm evolved on heating limestone (rounded off to two decimal places) at 1200 K is ______. (Given: R = 8.314 J K 1 mol 1) Q.58 CY The mean ionic activity coefficient of 0.004 molal CaCl2 in water at 298 K (rounded off to three decimal places) is ______. (Given: Debye-H ckel constant for an aqueous solution at 298 K is 0.509 kg 1/2 mol 1/2) 20/21 JAM 2021 Q.59 CHEMISTRY - CY For the reaction, k1 = 2.5 105 L mol 1 s 1, k 1 = 1.0 104 s 1 and k2 = 10 s 1. Under steady state approximation, the rate constant for the overall reaction in L mol 1 s 1 (rounded off to the nearest integer) is ______. Q.60 For the molecule, CH3 CH=CH CH(OH) CH=CH CH=C(CH3)2 the number of all possible stereoisomers is ______. END OF THE QUESTION PAPER CY 21/21 Answer Key of JAM-2021 Chemistry (CY) Paper Note: Question numbers pertain to the question paper published on the JAM 2021 website Q. No. Answer Q. No. Answer 1 C 31 A, B, D 2 C 32 A, C 3 D 33 C, D 4 C 34 A, C 5 A 35 A, D 6 C 36 A, D 7 B 37 B 8 B 38 A, B, C 9 B 39 B, C, D 10 A 40 A, B, D 11 B 41 6 12 D 42 45 13 C 43 26.7 to 26.8 14 B 44 -7880 to -6150 or 6150 to 7880 15 C 45 3.9 to 4.1 16 C 46 7 17 D 47 9.7 18 B 48 1.44 to 1.47 19 D 49 -5.81 to -5.75 20 D 50 507 to 510 21 B 51 -84.8 to -84.2 or 84.2 to 84.8 22 C 52 38.98 to 39.25 23 A 53 50 24 MTA 54 2.60 to 2.62 25 C 55 1.12 to 1.14 26 C 56 373.201 27 A 57 4.20 to 4.35 28 C 58 0.772 to 0.775 29 B 59 250 30 A 60 8

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