Chemistry Past Paper PDF

(CHEMISTRY) SECTION - I 34. Three salts A, B and C of sodium are treated with dilute HCl separately and following observations Multiple Choice Questions: This section contains...

(CHEMISTRY) SECTION - I 34. Three salts A, B and C of sodium are treated with dilute HCl separately and following observations Multiple Choice Questions: This section contains are made: 20 multiple choice questions. Each question has A + dil. HCl Colorless gas which turns moist 4 choices (1), (2), (3) and (4), out of which ONLY ONE Pb(OAc)2 paper black is correct. B + dil. HCl Colorless gas which turns acidified 31. Select the incorrect statement from the given K2Cr2O7 solution green options about [MnCl6]3– C + dil. HCl Brown gas which turns acidified (1) Paramagnetic with calculated spin only KI containing starch solution blue magnetic moment of 4 6 BM Select the correct option with respect to salts A, (2) High spin complex B and C. (3) Will remain paramagnetic if all Cl– are 2 replaced by CN– (1) A contains S2 , B contains SO3 and C (4) Hybridization of Mn is sp3d2  contains NO2 32. Consider the below given reaction 2 (2) A contains SO3 , B contains S2 and C  2KMnO4  513 K  A  B  O2 contains NO2  (3) A contains S2 , B contains NO2 and C A and B respectively are 2 (1) K2MnO4 and MnO2 contains SO3 2 (2) Mn2O7 and K2MnO4 (4) A contains S2 , B contains SO3 and C  (3) Mn2O3 and K2O contains NO3 (4) K2MnO4 and MnO 35. Choose the option containing correct match between List-I and List-II. 33. List-I List-II (Coordination (Coordination compound) geometry and magnetic property) (A) [Ni(CO)4 ] (P) Square planar (B) [Ni(dmg)2 ] (Q) Tetrahedral (C) [Pt(NH3 )2 Cl(NO2 )] (R) Diamagnetic (D) [CoCl4 ]2 (S) Paramagnetic (1) (A) Q, S; (B) P, R; (C) P, Q; (D) Q, R (2) (A) Q, R; (B) P, R; (C) P, R; (D) Q, S (3) (A) Q, R; (B) P, R; (C) Q, S; (D) Q, S (4) (A) Q, R; (B) P, S; (C) P, Q; (D) Q, S 36. Select the incorrect statement about oxidation 40. When KMnO4 is added dropwise in faintly states of transition elements. alkaline solution of iodide, then it gets oxidized to (1) Low oxidation states are found when a  (1) I2 (2) IO3 complex has ligands capable of  acceptor character (3) I3 (4) IO (2) Mo(VI) and W(VI) are found to be more stable than Cr(VI) 41. (3) Cu2+(aq) is more stable than Cu+(aq) (4) The ability of fluorine to stabilize higher oxidation states exceeds oxygen in case of transition metal compounds 37. 42. Borax bead test is performed on copper sulphate and following observations are made. Na2B4O7  10H2O  heat Glassy bead (B2O3 38. Griess-Ilosvay is test for and NaBO2) (1) Nitrite ion (2) Nitrate ion Oxidizing flame : (3) Sulphite ion (4) Sulphate ion CuSO4 + Glassy bead  Non-lu min ous flame A B Blue green bead 39. Select the correct statements from the following list of statements. (1) A is CuBO2 (a) Complexes of Mn2+ and Fe3+ with CN– have (2) B is SO2 same spin only magnetic moment (3) A is Cu(BO2)2 (b) The 3d-electronic configuration of Mn(II) in (4) A is Cu 2 3 [MnBr4]2– is e t2 43. Which one of the following molecules can show (c) The highest energy of d-orbital in square fac- and mer- isomerism? (en-ethylene diamine, planar field is dz2 bipy - bipyridine) (d) Mnn  has different geometry and same (1) [Fe(en)(bipy)Cl(NH3 )]2 calculated spin only magnetic moment in (2) [Co(gly)3 ] [MnBr4]2– and [MnF6]2– (3) [Pt(en)2 Cl2 ]2 (1) (a) and (b) (2) (a) and (c) (3) (b) and (d) (4) (b) and (c) (4) [Pt(bipy)2 BrCl]2  44. Assertion (A) : Transition metals form alloys 48. Which elements of lanthanoids exhibit oxidation readily. state of +4 other than +3? Reason (R) : Transition metals have similar radii. (1) Ce, Dy, Tb (1) (A) is correct but (R) is incorrect (2) Yb, Eu, Sm (2) Both (A) and (R) are correct and (R) is (3) Nd, Ce, Sm correct explanation for (A) (4) Ho, Tm, Yb (3) Both (A) and (R) are correct and (R) is incorrect explanation for (A) (4) Both (A) and (R) are incorrect 45. 49. 50. Which of the following ions is paramagnetic? 46. Which metal ion gives precipitate with H2S in (1) La3 presence of NH4OH? (2) Ce4 (1) Ca2 (2) Sr 2 (3) Yb2 2 2 (3) Mn (4) Ba (4) Tm3 SECTION - II 47. IUPAC name of [Cr(CH3 —NH2 )3 Cl3 ] is Numerical Value Type Questions: This section (1) Trichloridotrimethylaminechromium(III) contains 10 questions. In Section II, attempt any five questions out of 10. The answer to each question is (2) Trichloridotrimethylaminechromate(III) a NUMERICAL VALUE. For each question, enter the (3) Trichloridotris(methylamine)chromium(III) correct numerical value (in decimal notation, (4) Trichloridotris(methylammine)chromium(III) truncated/rounded‐off to the second decimal place; e.g. 06.25, 07.00, 00.33, 00.30, 30.27, 27.30) using the mouse and the on-screen virtual numeric keypad in the place designated to enter the answer. 51. How many of the following compounds/ions are coloured? [Cu(CH3CN)4]BF4, [Zn(H2O)6]2+, [Ti(H2O)6]4+, Cu2Cl2, CuCl2, [Ni(en)3]2+, [Ni(NH3)6]2+, [Cd(CN)4]2– 52. When salt-X is mixed with equal amount of K2Cr2O7 in a test tube and conc. H2SO4 is added followed by heating the test tube, red fumes of compound-Y is obtained which is passed into NaOH solution. Solution becomes yellow due to formation of compound-Z. The sum of total atoms present in, Y and Z is 53 If t of complex [Co(NCS)4 ]2 is 9.3 × 10–22 J. Then, crystal field stabilization energy is x x J mol–1. Then the value of is ____. 33.48 Use, Avogadro’s number = 6 × 1023 mol–1 54. In laboratory, potassium permanganate is prepared by oxidizing manganese(II) ion salts using peroxodisulphate. How many moles of manganese(II) ions are oxidized by each mole of peroxodisulphate? 55. Total number of stereoisomers possible for square planar complex [PtCl(NH3)Py(NH2NH2)]+ is x and total number of optically active isomers possible for [V(C2O4)3]3– complex ion is y. Then x the value of is _____. y