a. 1 b. 4 c. 8 d. 6 Ans. c Explanation : In the diamond cubic unit cell there are eight corner atoms, six face centered atoms and four more atoms inside the structure. Number of atoms present in a …
a. 4 b. 6 c. 8 d. 10 Ans. c (4)
a. 2 b. 4 c. 6 d. 8 Ans. b (9)
CaF 2 is a. Face centred cubic b. Body centred cubic c. Simple cubic d. Hexagonal closed packing Ans. a Explanation : Space lattice of CaF 2 is face centred cubic (6)
a. 2√2r, 4r/√3, 2r b. 4r√3, 2√2r, 2r c. 2r, 2√2r, 4r/√3 d. 2r, 4r√3, 2/√2r Ans. a (6)
a. NH 3 b. C 2 H 4 c. C O 2 d. SO 2 Ans. a Explanation : In NH molecule the original appearance is repeated as a result of rotation through 120° Such a axis is said to be axis of three- fold …
a. Face centred cubic lattice b. Body – centred c. Simple cubic lattice d. Orthorhombic lattice Ans. b Explanation : Potassium (K) has bcc lattice. (10)
X – ions around A + ion in solid AX is given in the figure (not drawn to scale). If the radius of X– is 250 pm, the radius of A+ is a. 104 pm b. 125pm …
a. 1624 nm b. 0.1246nm c. 0.2164nm d. 0.1426nm Ans. b (16)
a. Lone pair of electrons b. Free valence electrons c. Cations d. Anions Ans. b Explanation : Graphite is a good conductor of electricity due to presence of free valence electrons in graphite each carbon is sp ^ 2 …
a. 1/2 (a) : √3/2(a) : √2/2 (a) b. 1 (a) : √3 (a) : √2(a) c. 1/2 (a) : √3/4(a) : 1 / √2/2 (a) d.1/2 (a) : √3/(a) : 1/ √2 (a) Ans. c (7)
a. 1 b. 2 c. 3 d. 4 Ans. d (9)
Molecule/ion Magnetic property (i) C6 H 6 …
a. SO 2 (solid) b. I 2 c. Diamond d. H 2 O (ice) Ans. c (4)
a. Quartz b. Tridymite c. Cristobalite d. Kieselguhr Ans. d Explanation : The amorphous form of silica is kieselguhr. (6)
a. 8 b. 6 c. 4 d. 2 Ans. a (6)
a. √3/4 (a) b. √3/2 (a) c. 2 √3 (a) d. 2/√3 (a) Ans. b (3)
α = β = 90 º and γ = 120 º is a. Cubic b. Hexagonal c. Orthorhombic d. Rhombohedral Ans. b (7)
a. 4 b. 6 c. 8 d. 12 Ans. d (4)
rc+ / r a- is a. 0. 732 – 1.000 b. 0.414 – 0.732 c. 0.225 – 0.414 d. 0.155 – 0. 225 Ans. c (6)
a. 0.732 r b. 0. 414 r c. 0. 225 r d. 0. 155 r Ans. b Explanation : For octahedral void r = 0. 414 R. (8)
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)