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mical Bonding and Catatyy,, Basle Science : Chemistry 110 ches, , ee PFET Teo CLL ipa AA e sg =, , Write a short note on electronic theory., Why atoms of inert gases do not form molecules ?, Define chemical bond. How is it formed ?, Write a short note on ionic bonding., Explain the formation of MgO molecule. ., What is a covalent bond ? How is it formed ? Write properties of covalent bonding, Explain the formation of (i) Cl molecule, (i) HCI molecule, (il) CO, molecule, (iv) Ni, Distinguish between ionic and covalent bonds., Define ‘covalent bond’. Explain the formation of ‘dative bond’ giving example., . Write properties of co-ordinate bond., .. Discuss hydrogen bonding and explain why molecule with hydrogen bonding has polar character., . Explain inter and intra molecular hydrogen bonding with suitable examples., - How is hydrogen bonding classified ? Give example of each class. Write characteristics of hydrogen bond., . Which bond occurs within metallic elements. Write its characteristics., . Compare ionic, covalent and metallic bonds., . Explain any four metallic properties on the basis of metallic bond., . What is Van der Waal's force ? Name its types. Write characteristics of Van der Waal's forces., . "Arrangement of particles impart solid, liquid and gaseous state to matter”. Explain in brief., Compare properties of solids, liquids and gases., . Define solids. How are they classified ? Give examples of each class., . Distinguish between crystalline solids and amorphous solids., . How crystalline solids are classified on the basis of bonding ?, . What is metallic bonding ? Explain the properties of metals on the basis of “electron sea model”., . List any four properties of crystalline and amorphous solids., . How are crystals classified on the basis of their unit cell arrangement ?, . What is unit cell ? Draw unit cell for following types :, (i) Simple cubic, (ii) Face-centered cubic, (iii) Body-centered: cubic., 27. (i) Metals are good conductors of heat, electricity and have a luster. Give reason., (ii) Draw the unit cell for BCC and FCC structures., 28. Define catalysis and catalyst., 29. Define catalysis and classify them., 30. What is heterogeneous and homogeneous catalysis ? Explain with examples., 31. How catalysts are classified ? Explain each class with an example., 32. Write short notes on : (i) Promoters, (ii) Inhibitors., 33, Write characteristics of a catalyst., 34. Give industrial applications of a catalyst., 35, Differentiate between promoters and inhibitors., , molecule., , WO Mnanwawn, , NNN Be ee ee ee ee oe, BRRSRBSRSSRSUSEEERES, , , , DERE Tee ee, 1. Complete transfer of one or more electrons between atoms constituting in forming _......, (a) ionic bond (b) covalent bond (©) co-ordinate bond (d) dative bond, 2. When single atom provides both electrons which are needed for completion of covatent bond then it leads to ....«, (a) ionic bond (b) covalent bond (0) co-ordinate bond () dative bond, 3. Metals lose electrons from their lattice to become ..,,..,, (a) positive ions (b) negative ions (Q) alkalies (@) non-metats, , 4, Inammonium ion, electrons required between hydrogen ion and nitrogen ion are ,....., (0) 1 (b) 2 © 3 (4

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Chemical Bonding and Catalysis, , , , , , , , Basic Science : Chemistry 1.19, 5. Dative covalent bond is found in ...... ;, (@) ammonia (b) ammonium ion (c) urea (d) nitrogen, 6. Pairs of outer shell electrons not used in bonding are called as ......, (a) valence electrons (b) donor electrons (0) electrovalent electrons (d) lone pairs, 7. Charge on any ion depends upon gain or loss of ......, (a) electrons (b) protons () neutrons (d) nucleons, 8. Bond formed by sharing of four electrons is called as ......, (a) covalent bond (b) electrovalent bond (QO. dative covalent bond (d) double covalent bond, 9. For dative covalent bonding, one atom having a lone pair of electrons combines with ......, (a) an electron deficient compound (b) an expanded octet, (Q) a proton of other atom (d) aneutron of other atom, 10. When the bond is formed by sharing of two pairs of electrons by atoms, then the bond is called as ......, (a) single covalent bond (b) double covalent bond (c) triple covalent bond = (d) ionic bond, 11. Neither ions nor electrons are free to move in ......, (a) liquids (b) metals (© ionic solids (d) all of the above, 12. Metals and non-metals combine to give electronic configuration of ...... ; ., (a) alkalies (b) noble gases | (©) metalloids (d) acids, 13. Weak forces between molecules are called as ...... :, (a) molecular forces (b) intermolecular forces (c) intramolecular forces (d) extramolecular forces, 14. Noble gases exist as ...... . : :, (a) monoatomic (b) diatomic (Q) polyatomic (@) none of these, 15. Electrons are usually lost by ......, (a) metals (b) non-metals ' (©) inert gases (d) all of the above, 16. In nitrogen molecule, number of electrons required by each nitrogen atom in outer shell are ......, () 1 () 2 @ 3 (4, 17. When magnesium reacts with oxygen, nature of the bond formed is ., (a) ionic (b) covalent . (metallic (d) dative, 18. Metals are good conductors due to ...... ‘, (a) ionic lattice (b) crystalline lumps () mostly solids . (d) localized electrons, 19. Physical properties of bonding are influenced by bonding between ........., (a) atoms (b) ions (©. molecules (d) all of the above, 20. Conduction of electricity in metallic bonding is due to the presence of ...-.., (a) protons 22): lattice ‘ (0) delocalized electrons “(d) nucleus, 21. Attempt in ionic bond formation is ........., (a) to get rid of excess electrons (b) to attain configuration of noble gases, (©) to avoid further reaction (d) all of the above, 22. When a covalent bond is formed between hydrogen atom and a very electronegative atom, then it is known as, (a) ionicbond (b) hydrogen bond (¢) co-ordinate bond (d) all of the above, 23. Metal atoms ......, (0) lose their outer electrons (b) become positively charged, , (©) became negatively charged : (d) both (a) and (b)

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[Basle Selenco : Chemistry =, 24. Nitrogen molecule is an example of «+++ ble covalent bond, (a) single covalent bond ) cor ordinate bor, (triple covalent bond CT hed Oo, 25. Regular arrangement in which atoms ore closely packed together il 2 (d)_ none of the above, (a) tetrahedral structure (b) lattice crystal ail, 26. Representation of bond by a single, double or triple line js done in vn @ ionic bond, (a) metallic bond (b) co-ordinate bond (od covalent bon, 27. Covalent compou!, ta) a ct onli ea (b) non conductors of electricity, (0 poor conductors of electricity (d) none of the above, 28. Resulting a loss of electrons (e") forms .....- heck (d) positive ions, (a) anodes (b) cathodes (9) negative ions, 29. Molecules which have permanent dipole are known ds ....+- i) tripolar, (a) polar (b) dipolar (9. non-polar é, 30. Electrovalent bond is another name of ....-., (a) metallic bond (b) covalent bond (9) ionic bond tte etinete bot, 31. When molecule is formed by chemical bonding then .....(a) nucleus of combining atoms participate, (b) valence electrons of combining atoms participate, (QO. valence electrons and inner cell electrons participate, (d) none of the above, 32. Which statement is incorrect for metallic bond ?, (a) there is attraction between delocalized electrons and atomic kernel, (®) directional property is shown by metal :, (9 delocalized electron can change their position easily in crystal, (d) explanation of metallic bond can be given by ‘electron sea model’, 33, Which of the following characteristic does not possess by the metal ?, (a) luster, (b) ductility, (Q) increase in conductance by increase in temperature, (d) malleability, 34, On which factor, conductance of metals is responsible ?, (a) ions (b) delocalized electrons —_(c)_ atomic kernel () number of atoms, 35. The difference between the number of atoms in a unit cell of a BCC crystal and an FCC crystal is, (a) 1 () 2 (4 DDR, , 36., , 37., , (Reason : The number of atoms per unit cell in BCC crystal is 2, The number ; ;, is 4, So difference is 4-2 = 2) Of atoms per unit cell in FCC cn, When partial positive end of one molecule is attracted weakly to i . ., , them i. 'y to partial negative end, then the force betwe*", (o) electrostatic force (b) dipole-dipole interaction, , (Q ionic bond (d) none of the above, , Tendency of atoms to acquire eight electrons in their valence shell is ......, , “ (b) duplet rule (c) triplet rule, , (@) octet rule, (d) all of the above

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Basic Sclence : Chemistry 1.21 Chemical Bonding and Catalysis, , 38., , 39., , 40., , 41., , 42., , 43., , 45., , 46., , 47., , 48., , 49., , 50., , 51., , 52., , 53., , , , To form anion, non-metal atom ......, , (a) looses electrons (6) gain electrons (©) looses protons (d) gains protons, , When two identical atoms share electron pairs and exert force on each other then the bond formed is ......, , @ non-polar covalent bond (b) polar covalent bond, , (©) double covalent bond (d) ionic bond, , Crystal lattice is actually ......, , (a) sum of points (b)_ array of points (lines of points (d)_ triangles of points, , In crystal lattice, particles are arranged in ......, , (a) two dimensions (b) four dimensions (©) three dimensions (d) single dimension, , Unit cell is the smallest building unit of ......, , (a) crystal lattice (®) liquids (O gases (d) none of the above, , Which of the following is an amorphous solid ? ,, , (a) diamond (b) glass (Q) sodium chloride (d) none of the above, . The sharp melting point of crystalline solids is due to ......, , (a) a regular arrangement of constituent particles observed over a short distance in the crystal lattice, , (b) a regular arrangement of constituent particles observed over a long distance in the crystal lattice, , (Q. same arrangement of constituent particles in different directions ;, , (d) different arrangement of constituent particles in different directions, , Solids which have array of positive and negative ions arranged in a characteristic pattern throughout the crystal, lattice are known as .. ‘, , , , (a) ionic solids (b). covalent solids (molecular solids (d) metallic solids, The lattice site in a pure crystal cannot be occupied by ......, (@) molecule (b) ion (9 electron (d) atom, , The co-ordination number of BCC structure is ......, , (a) 4 : () 8 @ 2 “\@.12, , Substances which alter the rate of chemical reaction without undergoing any chemical change are called as ......, (a) polymers (b) catalysts ; , (Q products (d) none of the above, , The process in which catalyst has a different phase to a reaction mixture is known as ..., (b) hypergeneous catalyst, , (d) hypogeneous catalyst, , (a) homogeneous catalysis, (Q) heterogeneous catalysis, The substances that reduce the effectiveness of a catalyst are called ......, , (a) promoters (6) autocatalysts (Q) inhibitors (d) none of the above, A catalyst cannot affect...... :, (a) products (b) rate of reaction (©) reactants (d) both (a) and (b), , When catalyst and reactants are in the same phase then it is called ......, , (a) homogeneous Catalysis (b) heterogeneous catalysis, (9 autocatalysis (@) catalysis, When a product acts as a catalyst then it is called as ......, (Q) autocatalysis (d) negative catalysis, , (a) self catalysis (b) positive catalysis

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Chemical Bonding and Cata,, Basic Science : Chemist 1.22 known as ——__, , ule is, table molec!, 54. A force that acts between two or more atoms to hold them together as 45, , (@) atom (b) molecule, , © valence electron @) chemical bonding, 55. Total number of electrons present in valence shell is known as ————*, , (a) valency (b) valence electron, , ( octet (d) all of these, , 56. The tendency of atoms to acquire eight electrons in their valence shell is ———~*, , ‘d) all of these, (a) Octet rule (b) Duplet rule (¢) Triplet rule @, , 57. The following statement is always correct for an atom, , , , (a) an atom has equal number of electrons and protons, (b) an atom has equal number of electrons and neutrons, (Q_ an atom has equal number of protons and neutrons, , (@) an atom has equal number of electrons, protons and neutrons, , 58. The tendency of atoms to acquire two electrons in their valence shell is, , () Octet rule () Duplet rule © (9 Triplet rule (d) all of these, 59. The atom excluding the valence electron is called of the atom., , (a) anion (b) kernel, , (Q) delocalized electron (d) kemél and delocalized electron, , 60. Atoms of the elements with eight electrons in their valence shell are, (a) chemically stable, (b) chemically unstable, (chemically reactive, (d): chemically stable and chemically unstable, , 61. Atoms of the elements has less than eight electrons in their valence shell are See, , (a) chemically stable : (b) chemically unstable, () chemically reactive ‘ (d) both (b) and (c), 62. The tendency of an element to pull the electron towards itself is known as a, (a) electropositivity : ‘ (b) ionization Potential, (c) electron affinity (d) electronegativity, 63. The tendency of an element to donate ihe) electrons easily is known as —__, (a) electropositivity () ionization Potential, (Q electron affinity : , @ electronegativity, 64. Correct electronic distribution in Mg atom is ————, @ 381 () 2,82 ©1383 @ tao, 65. Correct electronic configuration of Na atom is :, (@) 3,81 (6) 2,81 © 183, , @ 822