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REVISION TEST 3 CLASS- 12 SUB:CHEMISTRY (TERM -1) MM 35 TIME 1.5 HR, Instructions: 1. Question paper has 35 multiple choice questions carrying 1 mark each., 2. Each question is compulsory., Multiple Choice questions:, Q1. The mole fraction of C2H5OH (Mol. wt. = 46) in 5 molal aqueous ethyl alcohol solution is (a), 0.082, (b) 0.82, (c) 5, (d) 5 /55.55, Q2 A solution containing 12.5g of non-electrolyte substance in 185g of water shows boiling point, elevation of 0.80 K. Calculate the molar mass of the substance.(Kb = 0.52 K kg mol-1), (a) 53.06g mol-1, (b) 25.3 g mol-1, (c) 16.08g mol-1, (d) 43.92g mol-1, Q3. When acetone and chloroform are mixed together, hydrogen bonds are formed between them., Which of the following statements is correct about the solution made by mixing acetone and, chloroform ? (a) On mixing acetone and chloroform will form an ideal Solution, (b) On mixing acetone and chloroform positive deviation is shown since the vapour pressure, increases., (c) On mixing acetone and chloroform negative deviation is shown since there is decrease in, vapour pressure., (d) At a specific composition acetone and chloroform will form minimum boiling azeotrope, Q4 Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved, in the process is(a) lowering in vapour pressure of snow (b) depression in freezing point of snow, (c) increase in freezing point of snow(d) melting of ice due to increase in temperature by putting, salt., Q5 The molar conductance at infinite dilution of AgNO 3, AgCl and NaCl are 116.5, 121.6 and 110.3, S cm2 mol-1 respectively. The molar conductances of NaNO3 is :, (a) 111.4, (b) 105.2, (c) 130.6, (d) 150.2, Q6. Which of the following statement is wrong about galvanic cell ?, (a) cathode is positive charged, (b) anode is negatively charged, (c) reduction takes place at the anode, (d) reduction takes place at the cathode, Q7. The specific conductance of a N/10 KCl at 25°C is 0.0112 ohm-1 cm-1. The resistance of cell, containing solution at the same temperature was found to be 55 ohms. The cell constant, will be(a) 6.16 cm-1, (b) 0.616 cm-1, (c) 0.0616 cm-1, (d) 616 cm-1, Q8 As lead storage battery is charged, (a) lead dioxide dissolves, (b) sulphuric acid is regenerated, (c) lead electrode becomes, coated with lead sulphate, (d) the concentration of sulphuric acid decreases., Q9. Which of the following is Magnetite:(a) Fe3O4, (b) Fe2O3, (c) CuO, (d) FeS2, Q10. In the froth-floatation process, the ore particles float because, (a) they are light, (b) their surface is not easily wetted by water, (c) they bear electrostatic charge, (d) they are insoluble, Q11. For the reaction 2 A + B, D + E the following mechanism has been proposed :, A+B, C + D (slow), A+C, E (fast), The rate law expression for the reaction is, (a) Rate = k [A]2 [B], (b) Rate = k [A] [B], (c) Rate = k [A] [C], (d) Rate = k [A]2 [B] [C], Q12. The rates of reactions increase with increase of temperature because, (a) activating energy of the reacting molecules increases (b) kinetic energy of the product, molecules increases (c) the fraction of the reacting molecules possessing an energy equal to the, activation energy or more increases (d) the collisions between molecules decrease., Q13. Which one is correct for K = A eEa/RT ?, (a) Ea is energy of activation, (b) R is Rydberg constant, (c) K is equilibrium constant, (d) A is adsorption factor, Q14. The rate constant for a reaction becomes double when temperature is raised from 27 C to 37, C .Iits activation energy will be : (a) 106.5 kJmol-1 (b) 53.6 kJmol-1 (c) 46.2kJmol-1 (d) 98.7kJmol-1, Q15. The half life period of a first order chemical reaction is 6.93 minutes. The time required for, the completion of 99% of the chemical reaction will be (log 2 = 0.301), (a) 230.3 minutes, (b) 23.03 minutes, (c) 46.06 minutes, (d) 460.6 minutes, Q16. The Increasing order of acidic strength of the halogen acids is

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(a)HF <HCI <HBr <HI (b)HI<HBr <HCI <HF(c)HBr <HCI <HF <HI (d)HCI< HBr<HF <HI, Q17.The Hybridization of Xe in XeF4 is (a) SP3 (b) SP3d (c) SP3d2 (d) SP3d3, Q18. All the halogens are coloured. The colours arise due to, (a) weak van der Waals forces between the halogen molecules (b) strong oxidizing power of the, halogens (c) absorption of light which causes an electron to jump form the ground state to a, higher state (d) emission of light due to transfer of an electron from a higher state to the ground, state, Q19 Which of the following is arranged in order of increasing bond energy?, (a) I2 < Br2 < Cl2 < F2 (b) I2 < F2 < Br2 < Cl2 (c) I2 < Br2 < F2 < Cl2 (d) Cl2 < Br2 < F2 < I2, Q20. White phosphorus is kept under (a) kerosene oil (b) water (c) concentrated HNO3 (d) ethanol, Q21. Which of the following gases may act both as an oxidizing and a reducing agent?, (a) H2S, (b) SO3, (c) SO2, (d) O2, Q22. H2SO4is manufactured from SO2(g) by the, (a) Hall process, (b) contact process, (c) Raschig process, (d) Haber process, Q23 In a homogeneous catalysis, (a) The catalyst and the reactants should be gases, (b) The catalyst and the reactants should form a single phase, (c) Catalyst and the reactants are all solids, (d) The catalyst and the reactants are all liquids, 24. Enzymes are(a) Micro-organisms (b) Proteins (c) Inorganic compounds (d) Mould, Q25. Fog is an example of colloidal system (a) Liquid dispersed in gas (b) Gas dispersed in gas, (c) Solid dispersed in gas (d) Gas dispersed in liquid, Q26. Gold numbers of some colloids are : Gelatin : 0.005 – 0.01, Gum Arabic : 0.15 – 0.25; Oleate :, 0.04 – 1.0; Starch: 15 – 25.Which among these is a better protective colloid ?, (a) Gelatin, (b) Gum Arabic, (c) Oleate, (d) Starch, Q27 Which of the following is a bidentate ligand?, (a) Oxalato, (b) Carbonate, (c) Glycinato, (d) All of these, Q28. The IUPAC name for [Al(OH)(H2O)5]2+ is, (a) pentahydroaluminium hydroxide, (b) aquometaaluminate ion, (c) pentaaquaaluminate(III) hydroxide, (d) pentaaquahydroxoaluminium (III), Q29 Transition elements, (a) exhibit inert-pair effect, (b) show nonmetallic character, (c) do not form complex compounds, (d) exhibit variable oxidation states, Q30. The atomic and ionci radii (M3+ ions) of lanthanide elements decrease with increasing atomic, number. This, effect is called, (a) lanthanide contraction, (b) lanthanide expansion, (c) actinide contraction, (d) none of these, Q31Which one of the following exhibits the largest number of oxidation states?, (a) Mn (25), (b) Ti (22), (c) Cr (24), (d) V (23), Q32. Which of the following elements is not considered as transition element :, (a) Cu, (b) Ag, (c) Au, (d) Hg, Q33. Among the transition metals, the melting points of Zn, Cdand Hg are relatively low because, (a) their d shells are not completely filled, (b) their d electrons do not participate in metallic bonding, (c) their densities are higher, (d) of all the above, Q34 The magnetic moment of a transition metal ion has been found to be 3.87 BM .It is probably, (a) Fe3+, (b) Cr3+, (c) Ti2+, (d) Ni2+, Q35. KMnO4 is prepare from :, (a) MnO2, (b) Mn2O7, (c) K2MnO3, (d) K2MnO4, BY HEAD OFFICE, PPPP SCIENCE SEN SEC STATE TEAM