Chemistry Correct order of intermolecular forces: a.gas < liquid < solid b.liquid < gas < solid c.gas < liquid < solid d.gas = liquid = solid l molecular solid because the force between its molecules are: a.Ionic b.Covalent c.Metallic d.Vander Wall’s whn H20 chnges into ice the vol.increases as a.1% b.7% c.9% d.11% 1. Carbon exists as allotropes, which are different crystalline molecular forms of the same substance. Graphite and diamond are allotropes of carbon. Diamond is non-conductor while graphite is conductor because a) graphite has a layered structure b) in graphite all valence electrons are tetrahedrally bounded c) in graphite one of the valence electron is free to move Which is a pseudo solid a)CaF2 b)glass c)Nacl d)all in order to mentn the b.p of watr at 110C ,the extrnal pressur shud be a.btwn 760 nd 1200 torr b.b/w 200 nd 760 torr c.760 torr d.any value of pressur which of the following is strongest a)dipole - dipole forces b)instantaneous dipole-dipole forces c)ion dipole forces d)H-bonding Which of the following is present in non polar molecules a)dipole - dipole forces b)instantaneous dipole forces c)both a and b d)none strength ratio between H and covt bond is a.1:10 b.1:20 c.20:1 d.10:1 Thd ratio of close packed atoms to tetrahedral holes in cubic close packing is a.1:1 b.1:2 c.1:3 d.2:1 increase polarizability causes b.p to a.decrease b.increase c.no effect on b.p In a cubic lattice,a unit cell is shared equally by how many unit cells a.4 b.2 c.6 d.8 which of the following is an example of body centred cube ? a.Magnesium b.Zinc c.copper d.sodium The Cl -ive ion present at the corner of the unit cell is NaCl crstal contributes A.1/8th B.1/4th C.1/12th D.1 Two substances that have the same crystals structure are said to be: a.Isomorphous b.Anisotropic c.Isotropic d.Polymorphous Which of the following is not a characteristic property of a solid: a.Rigidly b.Definite volume c.High density d.Diffusion Water may boil at 170°C when external pressure is: a.760 torr b.170 torr c.2115 torr d.700 torr The compound that has zero dipole moment is: a.HCI b.H2S c.NH3 d.CH4 A single substance that crystallizes into two or more different forms under different conditions Is called: a.Polymorphous b.Isomorphous c.Allotrope d.Polymer The arrangemnt ABC..ABC is referred as a.cubic close packing b.octahedral close packing c.hexagonal close packing d. none The crystal systems are of: a.7 types b.10 types c.5 types d.8 types The surface formed by the breakage of a crystal is called _____ plane. a.Crystal b.Unit c.Cleavage d.None The rising of a liquid in a capillary tube is due to: a.Surface tension b.Evaporation c.Viscosity d.Liquification evaporation of water occurs at?? a. 0 degree celsius b. 100 degree c. 120 degrees d. all temperatures Which one of the following compound contain high value of surface tension? a.Hexane b.Water c.Mercury d.C2H5OH The reverse of melting, in which liquid is converted into solid is termed as: a.Boiling b.Sublimation c.Freezing d.Vaporization Ice is an example of: a.Ionic crystals b.Covalent crystals c.Molecular crystals d.Metallic crystals Ionic solids are characterized by: a.Low melting point b.Good conductivity in solid state c.Solubility in polar solvents d.High vapour pressure Transition temperature is exhibited by: a.Element b.Compound c.Both elements and compounds d.None of the above Evaporation causes: a.High temperature b.High pressure c.Cooling d.Vapour pressure Which of the following has isomorphous structure: a.NaF b.S c.Sn d.N Lattice energy is also termed as: a.Ionization b.Crystal energy c.Dissociation d.Bond energy Sugar crystals belong to the system: a.Cubic b.Mono-clinic c.Triclinic d.Orthorhombic Mercury does not wet the glass because of: a.Repulsion b.Weak cohesive force c.High viscosity d.Capillary action The process in which solid is directly converted into gaseous state is called: a.Evaporation b.Boiling c.Sublimation d.Transformation AgNO3 is a polymorphic having two different crystalline forms which are: a.Cubic, tetragonal b.Mono-clinic, hexagonal c.Cubic, orthorhombic d.Orthorhombic rhomboidal The system In which all the three axes are of equal length and at right angle to each other Is called: a. Hexagonal b.Trigonal c.Cubic d.Rectangular The reason that diamond and graphite have different physical properties is: a.Density b.Color c.Bonding d.Hardness In NaCI crystals. Na ion is surrounded by how many ions of CL: a.4 b.6 c.8 d.10 The molecules of CO2 in dry ice form the: a.Ionic crystals b.Covalent crystals c.Molecular crystals d.Any type of crystal Which of the following substancesis not amorphos a.polymer b.ruber c.glass d.AgNO3 Diamond and graphite are: a.lsómorphous b.Polymorphous c.Allotrope d.None of these among solids the highet M.P is exhibited by a. covalent solids b. ionic solids c. pseudo solids d. molecular solids In crystal structure of NaCl the arrangement of Cl- ions is a.Fcc b.both fcc and bcc c.bcc d.none
Posted on: Sun, 01 Sep 2013 15:12:56 +0000
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