mcqs on states of matter,solution,electrochemistry

States of matter, Solution and ElectrochemistryQuestions: 1. Compounds with identical crystal structure and analogous chemical formula are called (a) Isomorphous (b) Allotropes (c) Isomers (d) Isotones 2. Which of the following pairs is isomorphous? (a) FeSO4.7H2O and CuSO4.5H2O (b) FeSO4.7H2O and MnSO4.4H2O (c) FeSO4.7H2O and ZnSO4.7H2O (d) CuSO4.5H2O and MnSO4.4H2O 3. Of the following crystal lattices the one that has the largest packing fraction is (a) Body centred cubic (b) Simple cubic (c) Simple tetragonal (d) Covalent 4. Glass is (a) supper cooled liquid (b) Metallic crystal (c) Molecular crystal (d) Covalent crystal 5. Select the correct statement? (a) A cubic packed structure has eight tetrahedral and six actahedral interstices (b) Graphite has three dimensional crystal lattice (c) Diamond has two dimensional crystal lattice (d) Coordination number of body centred cubic lattice is eight. 6. For the various types of interaction the correct order of increasing a straight is (a) Covalent Z > X (b) X > Y > Z (c) Z > Y > X (d) Z > X > Y 80. Electrode potential data are given below: Based on the data, the reducing power of , Al and will increase in the order (a) (b) (c) (d) ****** Keys: 1 a 2 c 3 d 4 a 5 d 6 c 7 c 8 d 9 b 10 a 11 b 12 c 13 a 14 b 15 a 16 c 17 d 18 c 19 d 20 b 21 c 22 a 23 d 24 d 25 a 26 d 27 c 28 a 29 b 30 c 31 a 32 b 33 b 34 b 35 a 36 a 37 a 38 d 39 d 40 c 41 a 42 a 43 b 44 b 45 a 46 c 47 a 48 b 49 a 50 a 51 c 52 a 53 c 54 c 55 d 56 d 57 c 58 b 59 d 60 c 61 b 62 b 63 a 64 c 65 c 66 a 67 b 68 d 69 d 70 c 71 b 72 b 73 a 74 b 75 b 76 d 77 d 78 d 79 a 80 a Answers: 1. Compound having identical crystal structure and analogous chemical formula are called isomorphous. 2. FeSO4.7H2O and ZnSO4.7H2O are isomorphous. 3. fcc ( =ccp) has maximum space occupied and hence largest packing fraction. 4. Glass is a supercooled liquid. 5. Co-ord. no of body-centred cubic lattice is eight. 6. In order of strength van der Waals < dipole-dipole < hydrogen bond < covalent. 7. Layers of carbon atoms in graphite are held together by van der Waal’s force. 8. Crystal show good cleavage because their constituent particles are arrangement in planes. 9. For orthorhombic system . 10. Both gases and liquid possess fluidity and hence viscosity. 11. Velocity and hence the K.E. is maximum in the gaseous state. 12. Zinc has hcp crystal structure. 13. Ge belongs to group 14 and in to group 13. Hence on doing p-type semiconductor is obtained. 14. In graphite, the electrons are spread out between the sheets. 15. Energised flow from hot end to cold end in a metal rod. 16. Glass is amorphous solid. 17. H2O is polar. Hence it has higher critical temperature. 18. have largest sizes. 19. There are 14 Bravais lattices ( space lattices). 20. Bragg’s equation is n =2d sin . 21. Suppose no. of atoms Q in the ccp arrangement – 100. Then no. of tetrahedral sites =200. As all the tetrahedral sites are occupied by atoms P, therefore their no. = 200. Hence ratio of P : Q =2 : 1 i.e. the formula is P2Q. 22. For non-ideal solution showing positive dev., 23. Azeotropic mixtures distil unchanged in composition. 24. Azeotropic mixtures cannot be separated into its components by simple distillation. 25. Depression in freezing point (and not the freezing point) is a colligative property. 26. Mol. Wt. of non-volatile solute can be determined by Raoult’s law. 27. During osmosis the flow of solvent is from dilute solution to concentrated solution. 28. The net flow of the solvent is from dilute solution to concentrated solution. 29. A solution with higher osmotic pressure than the other is called hypertonic. 30. 31. Concentration inside the sugar beet cells is lass. So water flow out. 32. A hypertonic solution has higher concentration. 33. Hence 34. When solid is the solute, it is solvent that freezes. 35. For water, are 0.52 and 1.86o respectively. 36. Conc. of particle is max. in FeCl3 sol. So deviation in B. pt. will be max. and so actual B. pt. will be highest. 37. Isotonic solution have equal concentrations of particles. 38. Urea does not undergo dissociation of association. Hence van’t Hoff factor (i) =1. 39. . Thus concentration reduces to . 40. NaCl dissociates. Hence conc. of particles is greater. 41. Azeotropes distil unchanged in composition. 42. Al2(SO4)3 gives max. lons. Hence its osmotic pressure is maximum. 43. 3.42 g of sucrose/lit = 0.1 M, 0.18 g glucose on 0.1 L = 0.1 M 44. Hence . 45. Camphor has the maximum value of . 46. Osmotic pressure is a colligative property i.e. depends upon the no of particles of the solute. 47. Addition of solute lower the freezing point. 48. Addition of solute decreases the freezing point and increases the boiling point. 49. By definition of Nernst distribution law. 50. K4[Fe(CN)6] and Al2 (SO4)3 each dissociates to give 5 ions. 51. The solution of sugar in water contains free molecules. 53. By Def. of Raoult’s law, . (Note that is the mole fraction of the solvent in the solution). 54. 55. 4% NaOH means 5 g in 100 cc. Hence molarity . 56. 10% glucose sol means 10 g = Hence 1 mole will be present in 57. By def. of electrode potential. 58. Standard reduction potentials are taken as positive. 59. Refer to electromechemical series. 60. 1 F (96500 C) deposits 1 g eq. i.e. E = 61. 1 F deposits 1 g eq. 62. W = ZQ. If Q is same, . 63. The weight deposited does not depend upon temperature. 64. Charge on one monovalent ion = electronic charge = 1.60 10-19 coulomb. 65. Charge on one mole of monovalent ions = 1 Faraday = 96500 C. 66. With the attackable Current Electricity, Heating, Chemical and Thermoelectric of Current electrode, the reaction taking place is Cu Cu2 + . 67. ions are oxidized more easily reduced than to gives H2. 68. Conductance of electrolytic solution increases with temperature because dissociation increases. 69. A large –ve reduction potential means a high oxidation potential so that is easily oxidized. 70. Diamond is an insulator. 71. Electrolysis of CuSO4 sol using Pt electrodes gives copper at cathode and oxygen at anode. 72. EMF is +ve for Fe + Cu2 + Cu. 73. Lower the reduction potential, stronger is the reducing agent. 75. Conductivity cell is platinized to avoid polarization effect. 76. Higher the reduction potential, stronger is the oxidizing agent. 77. . For a sparingly soluble salt. Hence S= 78. increases with dilution for both strong and weak electrolytes. 79. Greater the reduction potential, less is the reducing power. States of matter, Solution and Electrochemistry 4 ***Mrs. Shallu Aggarwal Mobile #. 98786-08983 ***