12th Chemistry ,Chapter :- 1 ( Solid State )
(1) The number of atoms in a body centred cubic (bcc) unit cell of a monoatomic elementary substance is equal to:
(a) 1
(b) 2
(c) 3
(d) 4
Answer
(2) An atom at the corner of a unit cell contributes to the unit cell
(a) 1/4
(b) 1/2
(c) 1
(d) 1/8-
Answer
(3) The percentage of available space occupied by spheres in a cubic close packing (ccp) in three dimensions
(a) 26%
(b) 52.4%
(c) 74%
(d) 76%
Answer
(4) A Density of a crystal is given by the formula
(a) a^{3}M/ZN_{b}
(b) N_{A}M/ZA^{3}
(c) ZM/a^{3}N_{A}
(d) a^{3}N_{A}/ZM
Answer
(5) An ionic compound has a unit cell consisting of A ions at the cornerof the cube and B ions at the centres of the faces of the cube. The empirical formula of the compound is
(a) A2B
(b) AB3
(c) A2B
(d) AB
Answer
(6) The number of atoms in a simple cubic unit cell of a monoatomic elementary substance is equal to:
(a) 1
(b) 2
(c) 3
(d) 4
Answer
(7) An atom at the body centre of a unit cell contributes to the unit cell
(a) 1/4
(b) 1/2
(c) 1
(d) 1/8
Answer
(8) The percentage of available space occupied by spheres in a hexagonal close packing (hcp) in three dimensions:
(a) 26%
(b) 52.4%
(c) 74%
(d) 76%
Answer
(9) Close packing is maximum in the crystal lattice of:
(a) face centred cubic
(b) body centred cubic
(c) simple cubic
(d) all have same value
Answer
(10) Copper crystallises in face centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm:
(a) 108
(b) 128
(c) 157
(d) 181
Answer
(11) Which one of the following is non-crystal Elinor amorphous in nature?
(a) Diamond
(b) Graphite
(c) Common salt
(d) Glass
Answer
(12) An element with atomic mass 100 has a bec structure and length 400 pm. The density of element is
(A) 10.37 gcm
(b) 5.19gcms
(c) 7.29 gcms
(d) 2.14gcm
Answer
(13) Coordination number of Clion in NaCl structure is:
(a) 2
(b) 6
(c) 3
(d) 4
Answer
(14) The point defect which lowers the density is:
(a) Frankel defect
(b) Schottky defect
(c) Metal excess defect
(d) None of the above
Answer
(15) What types of stoichiometric defects are shown by ZnS ?
(a) Frankel defect
(b) Schottky defect
(c) Both A and B
(d) none of the two
Answer
(16) Tetragonal system has the following unit cell dimensions:
(a) a=b=c, \alpha=\beta=\gamma=90^{\circ}
(b) a=b\ne c, \alpha=\beta=\gamma=90^{\circ}
(c) a\ne b\ne c, \alpha=\beta=\gamma=90^{\circ}
(d) a=b\ne c \alpha=\beta=,\gamma=120^{\circ}
Answer
(17) Which of the following has highest melting point?
(a) ionic crystals
(b) molecular crystals
(c) covalent crystals
(d) metallic crystals
Answer
(18) The density of Chromium is 7.2g~cm^{-3}. If the edge length of the cubic cell is 289 pm, what is the type of unit cell? (atomic mass of Cr=52 gmol¹)
(a) bcc
(b) fcc
(c) simple cubic
(d) none of the above
Answer
(19) Which of the following is paramagnetic in nature?
(a) TiO2
(b) NaCl
(c) N2
(d) CuO
Answer
(20) Frankel and Schottky defect both are found in:
(a) AgBr
(b) AgCI
(c) ZnS
(d) NaCI
Answer
(21) A metal has fee arrangement and edge length of the unit cell is 400 pm. Its atomic radius is:
(a) 124pm
(b) 132 pm
(c) 142pm
(d) 128 pm
Answer
(22) An ionic compound has bee structure with atoms A occupying the corners of the unit cell and B at the body center. The formula of ionic compound is:
(a) AB
(b) AB2
(c) AB_{7}
(d) AB_{4}
Answer
(23) Which of the following is an example of diamagnetic substance?
(a) NaCI
(b) CuO
(c) FeO
(d) TiO2
Answer
(24) Diamond is an example of:
(a) Ionic solid
(b) Molecular solid
(c) Covalent solid
(d) Metallic solids
Answer
(25) The number of Bravais lattices for cubic crystals is:
(a) 3
(b) 4
(c) 7
(d) 14
Answer
(27) The radius of an atom in a body centred cube of edge length ‘a’:
(a) a/2
(c) 9\sqrt{2}/2
(b) a\sqrt{3}/2
(d) a\sqrt{3}/4
Answer
(28) Which of the following is not a good conductor?
(a) Cu (metal)
(b) (2) NaCl (aq)
(c) NaCl (molten)
(d) NaCl (s)
Answer
(29) Constituent particles of CCl4 are:
(a) Ions
(b) Molecules
(c) Atoms
(d) None of these
Answer
(30) H_{2}O (Ice) is an example of:
(a) Polar molecular solid
(b) Ionic solid
(c) Hydrogen bonded molecular solid
(d) None of these
Answer
(31) CaF2 is an example of
(a) Covalent bond
(b) Ionic bond
(c) Metallio bond
(d) None of these
Answer
(32) Ag is an example of:
(a) Ionic solid
(b) Metallic solid
(c) Co-valent solid
(d) None of these
(b) Metallic solid
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