CHEMISTRY CLASS XII UNIT 1 SOLID STATE
Quiz by TEJINDER SINGH
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20 questions
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- Q1Which of the following is an amorphous solid?Quartz glass (SiO2)Chrome alumGraphite (C)Silicon Carbide (SiC)45s
- Q2Which of the following statement is not true about amorphous solids?On heating they may become crystalline at certain temperatureAmorphous solids can be moulded by heatingThey are anisotropic in natureThey may become crystalline on keeping for long time45s
- Q3The sharp melting point of crystalline solids is due to____Different arrangement of constituent particles in different directionsA regular arrangement of constituent particles observed over a long distance in the crystal latticeA regular arrangement of constituent particles observed over a short distance in the crystal latticeSame arrangement of constituent particles in different directions.45s
- Q4Iodine molecules are held in the crystal lattice by __________London forcesCoulombic forcesDipole-Dipole interactionsCovalent bond45s
- Q5Which of the following is a network solid?H2O (Ice)DiamondSO2 (Solid)Iodine (I2)45s
- Q6Graphite is a good conductor of electricity due to the presence of_____free valence electronslone pair of electronsAnionsCations45s
- Q7Cations are present in the interstitial sites in _______Vacancy defectFrankel defectSchottky defectMetal deficiency defect45s
- Q8Schottky defect is observed in crystals when_______equal number of cations and anions are missing from the lattice.some lattice sites are occupied by electrons.some cations move from their lattice site to interstitial sitessome impurity is present in the lattice.45s
- Q9Which of the following point defects are shown by AgBr (s) crystals? (A) Schottky defect (B) Frenkel defect (C) Metal excess defect (D) Metal deficiency defect(A) and (B)(B) and (D)(C) and (D)(A) and (C)45s
- Q10The correct order of the packing efficiency in the different types of unit cells is_____fcc < bcc > simple cubicbcc < fcc > simple cubicfcc > bcc > simple cubicfcc < bcc < simple cubic45s
- Q11Which of the following defects is also known as dislocation defect?Simple interstitial defectNon-stoichiometric defectSchottky defectFrenkel defect45s
- Q12In the cubic close packing, the unit cell has ______4 tetrahedral voids within the unit cell8 tetrahedral voids within the unit cell4 tetrahedral voids each of which is shared by four adjacent unit cells8 tetrahedral voids each of which is shared by four adjacent unit cells45s
- Q13The edge lengths of the unit cells in terms of the radius of the spheres constituting fcc, bcc and simple cubic unit cell are respectively____2r, 4r/√3, 2√2r4r/√3, 2√2r, 2r2r, 2√2r, 4r/√32√2r, 4r/√3, 2r45s
- Q14How many unit cells are present in a cubic shaped ideal crystal of NaCl of mass 1.0 g?1.28 x 10 211.71 x 10 212.57 x 10 215.14 x 10 2145s
- Q15In a fcc arrangement of P and Q, where P atoms are at the corner of the unit cell, Q atoms at the face centers and two atoms are missing from the two corners in each unit cell, then the formula of the compound isPQ4P2Q3P4QP4Q545s