a. The ionic crystal of AgBr has Schottky defect b. The unit cell having crystal parameters a = b ≠ c, α = β = 90 º γ = 120 º is hexagonal c. In ionic compounds having Freanked defect …
a. Molecule b. Ion c. Electron d. Atom Ans. c Explanation : Each point in a lattice is known as lattice point which is arranged in fixed stoichiometric ration Hence, existence of free electrons are not possible it is possible …
a. Hexagonal b. Orthorhombic c. Cubic d. Triclinic Ans. d Explanation : In a traiclinic crystal has no rotation of symmerty (9)
K+ and F – ions if cell edge is a cm a. 2a cm b. a/2 cm c. 4a cm d. a/ 4 cm Ans. b Explanation : Distance between K+ and F – = 1/2 x length of the …
a. Sodium b. Magesium c. Zine d. Copper Ans. a Explanation : Sodium (Na) is a body centred cube. (6)
a. 4 and 2 b. 9 and 14 c. 14 and 9 d. 2 and 4 Ans.d (7)
a. 8 b. 4 c. 2 d. 6 Ans. d Explanation : a cube has 6 faces so it is shared by 6 unit cells. (9)
a ≠ b ≠ c, α ≠ ϒ = 90 º is a. Calcite b. Graphite c. Rhombic sulphur d. Monoclinic sulphur Ans. d Explanation : Monoclinic sulphur is an example of Monoclinic crystal system (8)
a. 7 b. 13 c. 32 d. 230 Ans. b Explanation : There are 14 Bravasi lattices (space lattices) (7)
a. lonic b. Covalent c. Metallic d. Molecular Ans.c Explanation : Metallic crystals are good conductor of heat and current due to free electrons in them (12)
a. Bigger ions form the close packed structure b. Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size c. Occupation of all the voids is not necessary d. The fraction of octahedral or tetrahedral voids …
a. Conducting solid b. Network solid c. Covalent solid d. Ionic solid Ans. d (16)
a. SiO2 B. MgO c. SO2 (s) d. CrO2 Ans. d Explanation : CrO2 , TiO and ReO are some typical metal oxides which show electrical conductivity similar to metal. Which SiO2 , MgO and SO2are oxides of metal. …
a. TiO b. SiO2 c. TiO3 d. MgO Ans. c Explanation : Certain metal oxides like VO 2, VO, VO 3 and TiO 3 show metallic or insulating property depending upon temperature, as temperature varies metalllic or insulating property varies. This is …
Mg (s) 2. TiO (s) 3. I 2 4. H 2 O (s) a. only 1 b. only 2 c. 3 and 4 d. 2, 3 and 4 Ans.c Explanation :Iodine is a non polar molecular solid …
a. London forces b. Dipole dipole interactions c. Covalent bonds d. Coulombic forces Ans. a (6)
a. London forces b. Dipole- dipole interaction c. Covalent bonds d. Coulombic forces Ans.a Explanation : Iodine molecules are a class of non polar molecular solid in which constituents Hence value of refractive index is same in all directions can …
a. Same in all directions b. Different in different directions c. Cannot be measured d. Always zero Ans.a Explanation : Since quartz glass is an amorphous solid having short range order of constituents. Hence value of refractive index is same …
a. Graphite (C) b. Quartz glass (SiO2) c. Chrome alum d. Silicon carbide (SiC) Ans. b Explanation : Quartz glass (SiO2) is an amorphous solid due to its short range order of constituent particles (9)
a. Solid substance in real sense b. Liquid in real sense c. Supercooled liquid d. Substance with definite melting solid Ans. c (6)
a. Weakly bonded together b. Strongly bonded together c. Spherically symmetrical d. Arranged in planes Ans. d Explanation : Crystals show good cleavage because their constituent particles are arranged in planes. (9)
a. Fe3 O4 b. CrO 2 c. H2 O d. MnO Ans. d Explanation : MnO this aries when the dipole alignment is zero due to equal and opposite alignment (8)
a. Octahedral sulphur b. Monoclinic sulphur c. Plastic sulphur d. Colloidal sulphur Ans. a (21)
a. They melt over a range of temperature b. They are anisotropic c. There is no orderly arrangement of particles d. They are rigid and incompressible Ans. b Explanation : Amorphous solid are isotorpic because these substances show same properties …
a. KCl b. Glass c. lce d. Diamond Ans.b Explanation : Amorphous or non- crystalline solids do not have sharp melting point. (9)
a. Changes abruptly form solid to liquid when heated b. Has no definite melting point c. Undergoes deformation of its geometry easily d. Has an irregular 3- dimensional arrangements e. Softens slowly Ans. a Explanation : In crystalline solid there …
a. All the domains get oriented in the direction of magnetic field b. All the domains get oriented in the direction opposite to the direction of magnetic field c. Domains get oriented randomly d. Domains are not affected by magnetic …
a. Pyro – electricity b. Piezo electricity c. Ferro- electricity d. Ferri- electricity Ans. a Explanation : It is the definition of pyro-electricity (10)
a. Glass b. Rubber c. Plastic d. Sugar Ans. d Explanation : Sugar is a crystalline solid while glass, rubber and plastic are amorphous solids (3)
a. Si b. NaF c. Al d. Ar Ans. a Explanation : Silicon is a covalent crystal in which constituent particles are atoms. (8)
a. Silica b. Sodium silicate c. Silicon carbide d. Silicon Ans.a Explanation : Quartz is a covalent crystal having a framework of silicates or silica, i.e. a three dimensional network when all the four oxygen atoms of each of SiO4 …
a. They prossess high melting point and boiling point b. All are electrolyte c. Exhibit the property of isomorphism d. Exhibit directional properties of the bond Ans. d Explanation : Ionic srystals exhibit non-directional properties of the bond (12)
a. The capacity of layers of metal ions to slide over the other b. The interaction of electrons with metal ions in the other c. The presence of electrostatic force d. The crysyalline structure in metal Ans.a Explanation : When …
a. MnO 2 b. TiO 2 c. VO 2 d. CrO 2 Ans. a Explanation : MnO 2 is antiferromagnetic (9)
a. Paramagnetic substances are weakly attracted by magnetic field b. Ferromagnetic substances cannot be magnetised c. The domains in antiferromagnetic substances are oppositely oriented with respect to each other d. Pairing of electrons cancels their magnetic moment in the diamagnetic …
a. Very low value of electrical conductivity in the molten state b. Brittle nature c. Very strong forces of interactions d. Anisotropic nature Ans. a Explanation : Ionic solids easily dissociated into its ions in molten state and show high …
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 c. Same arrangement of constituent particles in different …
a. High temperature b. Low temperature c. High thermal energy d. Weak cohesive forces Ans. b (9)
a. Ionic crystal b. Covalent crystal c. Metallic crystal d. Molecular crystal Ans. d Explanation : Wax crystal are molecular crystal in which constituent particles are molecules having inter particle forces are Vander Waal ‘s forces. (8)
a. Atoms as their structural units b. Molecules as structural units c. Ions held together by electrostatic forces d. High melting points Ans. a Explanation : constituent paritcles of covalent compounds are atoms. (9)