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SOLID STATE MCQs

Total Questions : 22 | Page 2 of 3 pages
Question 11. Iron oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by iron ions
  1.    FeO
  2.    Fe2O3
  3.    Fe3O4
  4.    None of these
 Discuss Question
Answer: Option B. -> Fe2O3
Question 12. The coordination number in simple, fcc, bcc close packing arrangement will be respectively
  1.    1, 4, 2
  2.    6, 12, 8
  3.    4, 6, 8
  4.    none of the above
 Discuss Question
Answer: Option B. -> 6, 12, 8
Question 13. What is the smallest repetitive unit of the crystal / lattice structure known as?
  1.    Atom
  2.    Molecule
  3.    Lattice Point
  4.    Unit Cell
 Discuss Question
Answer: Option D. -> Unit Cell
Question 14. A compound is formed by A and B in which A occupies all corners and B occupies all face centres
  1.    AB
  2.    AB3
  3.    A3B
  4.    A3B2
 Discuss Question
Answer: Option B. -> AB3
Question 15. Which compound show both Schottky and Frenkel defect?
  1.    NaBr
  2.    KBr
  3.    AgBr
  4.    AgCl
 Discuss Question
Answer: Option C. -> AgBr
Question 16. What is the packing efficiency of FCC unit cell ?
  1.    52.4%
  2.    74%
  3.    68%
  4.    None of these
 Discuss Question
Answer: Option B. -> 74%
Question 17. When electrons are trapped in the crystal in the anionic vacancy, the defect is known as
  1.    Schottky defect
  2.    Frenkel defect
  3.    Stoichiometric defect
  4.    F-centre
 Discuss Question
Answer: Option D. -> F-centre
Question 18. If Z is the number of atoms in the cell that represents the closest packing sequence ABCABC
  1.    Z
  2.    2Z
  3.    Z/2
  4.    Z/4
 Discuss Question
Answer: Option B. -> 2Z
Question 19. The total number of tetrahedral voids and octahedral voids per unit cell of face-centred cell (fcc) are
  1.    8, 4
  2.    4, 8
  3.    2, 4
  4.    4, 2
 Discuss Question
Answer: Option A. -> 8, 4
Question 20. ZnO turns yellow on heating
  1.    Metal excess defect due to extra cation in the interstitial sites.
  2.    Metal excess defect due to anion vacancy.
  3.    Metal deficiency defect.
  4.    Frenkel defect.
 Discuss Question
Answer: Option A. -> Metal excess defect due to extra cation in the interstitial sites.

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