STD : 12 TH GSEB PART A. n mol

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1 STD : 12 TH CHEMISTRY RJ VISION PVT. LTD. (MOST STABLE & INNOVATIVE INSTITUTE) GSEB COURSE NAME: 12 TH Total Marks : 100 Time : 3 hrs. PART A Multiple Choice Questions : 1. If the order of reaction is n, then what will be the unit of its rate constant? (a) lit n mol n2 sec 1 (b) lit n mol 1 n sec 1 lit (c) sec n mol n 1 1 (d) mol n lit n sec 1 2. When reaction order is second order in reference to reactant, when concentration is doubled than calculate rate constant. (a) 3 times (b) 4 times (c) double (d) 8 times 3. With which compound, white phosphorous will give PCl 3? (a) SOCl 2 (b) SO 2 Cl 2 (c) SOCl (d) SO 2 Cl 4. Which compound will not give reaction with Hinsberg reagent? (a) C 2 H 5 NH 2 (b) (CH 3 ) 2 NH (c) (CH 3 ) 3 N (d) CH 5. What is react with diazonium salt and give diazonium fluoroborate? (a) NaBF 4 (b) HBF 4 (c) KBF 4 (d) LiAIF 4 6. What is Z? 3 C CH NH 2 3 (a) Aniline (b) Fluorobenzene (c) Nitrobenzene (d) o-fluorobenzene 7. Which is more basic? (a) CH 3 NH 2 (b) (CH 3 ) 2 NH (c) (CH 3 ) 3 N (d) C 6 H 5 NH 2 8. Which compound having this structure? (a) Pyrimidine (b) Purine (c) DNA (d) RNA 9. An emulsion is prepared of asphalt in and used for construction of roads. (a) water (b) kerosene (c) mineral oil (d) crude oil 10. is a hydrophilic sol. (a) Starch solution (b) Silver iodide (c) Magnesium sulphate (d) Arsenic sulfide 11. Which of the following compounds contain maximum oxidation state? (a) K 2 MnO 4 (b) KMnO 4 (c) MnO 2 (d) Mn 3 O 4 H.O. : Baroda [211/A Taksh Complex, Vasna Rd], Centres : Karelibaug [201, NBCC Plaza] Kota (R & D) www. rjvision.org 1

2 12. What is the theoretical value of magnetic moment of Fe 3+ ion? (a) 2.83 BM (b) 3.87 BM (c) 4.90 BM (d) 5.92 BM 13. What is the atomic number of iron and chromium in chromite ore? (a) +3, +2 (b) +3, +6 (c) +2, +6 (d) +2, If magnetic moment of Cr, Mn + and Fe 2+ are x, y, z respectively, then state their order. (a) x < y < z (b) x = y < z (c) x < x = y (d) x = y = z 15. Which structure is known as pthalamide? (a) (b) (c) (d) Zn HCl 16. C6H5COCH3 2H Y. Y What is Y? (a) Toluene (b) Ethyl benzene (c) Benzaldehyde (d) Benzamide 17. What is sodalime? (a) 3 : 1 proporation of NaOH + CaO (b) 50 : 50 proporation of NaOH + CaO (c) 2 : 1 proporation of KOH + CaO (d) 3 : 1 proporation of NaOH + Ca(OH) For which metals, zone refining method is used? (a) Impure metal (b) Semi metal (c) Innert metal (d) Heavy metal 19. Which substance is added when the ore contains iron during roasting? (a) Pine oil (b) Silica (c) Aniline (d) Fatty acid 20. SiO 2 is (a) plasticizer (b) filler (c) antioxidant (d) none of these 21. The formula of ZnO crystal after heating is (a) Zn 1 x O (b) Zn 1 + x O (c) ZnO (d) All of these 22. The co-ordination number in one dimensional close packing is (a) 2 (b) 3 (d) 4 (d) What is the IUPAC name of (a) Dimethyl Pentanol (c) 1, 2 dimethyl 3 pentanol (b) 3, 4 dimethyl cyclopentanol (d) 1, 2 dimethyl 3 cyclopentanol [ O] X Na2 Cr2O 7 / H2SO4 24. CH CH CH CH OH ; What is X? (a) CH 3 CH 2 COOH (b) CH 3 COOH (c) CH 3 CH 2 CH 2 COOH (d) CH 3 CH 2 CH 2 CHO 25. For which solution the value of Vant t Hoff factor is not 1? (a) Glucose (b) Sugar (c) Fructose (d) Acetic acid 26. The empirical formula of potash alum is (a) K. Al(SO 4 ) 2. 12H 2 O (b) K 2. Al(SO 4 ) 2. 12H 2 O (c) K. Al 2. (SO 4 ) 2. 12H 2 O (d) K. Al(SO 4 ) 2. 24H 2 O 27. Which particles can pass through semi permeable membrane? (a) Colloidal particles (b) True solution particle (c)suspension (d) None of these H.O. : Baroda [211/A Taksh Complex, Vasna Rd], Centres : Karelibaug [201, NBCC Plaza] Kota (R & D) www. rjvision.org 2

3 28. Which protein is present in muscle? (a) Caretine (b) Myocene (c) Insulin (d) Albumine 29. Which one is not a food colour? (a) β carotene (b) Caramel (c) Tetrazine (d) Indigo 30. What is Z? (a) Cumene (b) Phenol (c) Ethyl Benzene (d) None of these 31. CH 3 CH2 CH 2 OH + M CH 3 CH 2 CH 2 Cl + HCl + SO 2 what is M? (a) Red P (b) PCl 3 (c) SOCl 2 (d) NaCl + H 2 SO Which test used to detect the types of Alcohol? (a) Tollen s test (b) Dow process (c) Lucas test (d) Qumene process 33. Which of the following is a non biodegradable polymer? (a) PHBV (b) PGA (c) PMMA (d) PCL 34. Which of the following is used to get vulcanised rubber? (a) Phosphrous (b) Sulphur (c) Carbon (d) Silicon 35. What is used to measure the accurate potential of electrochemical cell? (a) Galvanometer (b) Ammeter (c) Voltmeter (d) Potentiometer 36. The potential of the cell depends on which factors? (a) Temperature (b) Conc. of solution (c) Nature of electrodes (d) All of these 37. Which reaction will take place during the electrolysis of conc. CuCl 2 with pt electrodes? (a) Cu (s) Cu 2+ (aq) + 2e (b) 2Cl Cl 2 + 2e (c) H 2 O 2H + 1 (aq) + O2(g) + 2e 2 (d) 4Cl + 2H 2 O 4HCl + O 2 + 4e e 38. Fuel cell was first ever presented by whom? (a) Einstein (b) Nernst (c) Lechlenche (d) Bacon 39. Which of the following not readily reacts with conc. HNO 3? (a) Gold (b) Silver (c) Copper (d) Nickel 40. Ozone possesses which colour in gaseous form? (a) Light blue (b) Dark violet (c) Dark blue (d) None given 41. Sulphur dioxide acts as a agent. (a) Oxidising (b) Reducing (c) Hydronating (d) None of these 42. Which acid is obtained by dissolving PCl 3 in water? (a) H 3 PO 3 (b) H 3 PO 2 (c) H 3 PO 4 (d) H 4 P 2 O What is X? (a) Cyclohaxane (b) Cyclohaxanone (c) Cyclohaxene (d) None of these H.O. : Baroda [211/A Taksh Complex, Vasna Rd], Centres : Karelibaug [201, NBCC Plaza] Kota (R & D) www. rjvision.org 3

4 44. What is X? (a) (b) (c) (d) 45. Which is the positive ligand from the following? (a) + NO (b) + NO 2 (c) (a) and (b) both (d) + CN 46. Where is the complex compound are used in mecinal chemistry? (a) Chelate theropy (c) X-ray theropy (b) Chemotheropy (d) Elopethy 47. What is the proportion of Ni in Monalmetal? (a) 67 70% (b) 60% 75% (c) 30% 50% (d) 40% 48. What is common formula of tetra saccharide? (a) C n H 2n 4 O n 2 (c) C n H 2n 8 O n 4 (b) C n H 2n 6 O n 3 (d) C n H 2n O n Which amino groups are present in proline amino acid? (a) Primary (c) Tertiary (b) Secondary (d) Quarternary 50. Which disease is possible by less ascorbic acid in our body? (a) Sterility (c) Scurvy (b) Skin disease, paralysis (d) Pernicious anemia H.O. : Baroda [211/A Taksh Complex, Vasna Rd], Centres : Karelibaug [201, NBCC Plaza] Kota (R & D) www. rjvision.org 4

5 PART B Section A [2 Marks] Very Short Answer Type Questions : 1. Explain difference between Distillation and Vapour phase refining. Explain Roasting of Zinc blande. 2. How white, red and black phosphorus are prepared? Give reaction of preparation of XeO Industrial production of chlorine. 4. Write two properties of two uses of KMnO Explain with reasons: Sucrose is a non reducing sugar. 6. Discuss preparation of polyester polymer. 7. Give the characteristics of PGA, PLA and Dextran. 8. Explain limitation of soap. Section B [3 Marks] Short Answer Type Questions : 9. If 1.08 gram Ag is deposited on the cathode when 7.5 ampere current passed through aqueous solution of AgNO 3 for 200 seconds, then calculate efficiency. (Ag = 108 u, N = 14 u, 0 = 16 u) Find the change in free energy and equilibrium constant of an electrochemical cell having standard potential cell having E 2+ Cu Cu = 0.34 V and E 2+ Fe Fe = Explain Hoffmann reaction with example. 11. Explain the terms Peptisation. 12. What is meant by doping? Explain giving example. 13. Write a note on β-elimination reaction in halokane. 14. Write short notes on Industrial production of Cumene process. H.O. : Baroda [211/A Taksh Complex, Vasna Rd], Centres : Karelibaug [201, NBCC Plaza] Kota (R & D) www. rjvision.org 5

6 Section C [4 Marks] Short Answer Type Questions : 15. How many gram of glucose should be added to 5 kg of water, so that the boiling point increases from 373 K to K. The molal elevation constant of solvent is 2.2 K kg mole The decomposition rate constant of hydrocarbon is sec 1 at 550K and activation energy is K joule mol 1. The following are the results of the three experiments carried for determination of differential rate of reaction 2NO (g) + Cl 2(g) 2NOCl (g) at definite temperature. No. Initial concentration of reactant mol.lit 1 [NO] [Cl 2 ] Initial rate of reaction d [ Cl2 ] mol.lit 1 sec. 1 dt (1) (2) (3) (1) Deduce the differential rate law. (2) Calculate order of reaction. (3) Find out value of rate constant. 17. Explain in detail the structural isomerism with examples. 18. Explain preparation of alcohols from carbonyl compounds by Grignard reagent. H.O. : Baroda [211/A Taksh Complex, Vasna Rd], Centres : Karelibaug [201, NBCC Plaza] Kota (R & D) www. rjvision.org 6