# MCQ | Solid State

Practice Test – I

The co-ordination number of metal crystallizing in a hexagonal close packed structure is

(A) 12

(B) 4

(C) 8

(D) 6

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Ans: (A)

Q:2. The unit cell with crystallographic dimensions

a = b ≠ c, a = b = g = 90° is

(A) Cubic

(B) Tetragonal

(C) Monoclinic

(D) Hexagonal

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Ans: (B)

Q:3. The anions (A) form hexagonal closest packing and atoms (C) occupy only 2/3 of octahedral voids in it, then the general formula of the compound is

(A) CA

(B) C2A2

(C) C2A3

(D) C3A2

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Ans: (C)

Q:4. Silver iodide has the same structure as zinc sulfide, and its density is 5.67gcm–3. The edge length of the unit cell is

(A) 4.50 Å

(B) 5.50 Å

(C) 6.50 Å

(D) 7.50 Å

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Ans: (C)

Q:5. In the closest packing of atom A of radius ra, the radius of atom B that can be fitted in tetrahedral void is

(A) 0.225

(B) 0.155 ra

(C) 0.414 ra

(D) 0.732 ra

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Ans: (A)

Q:6. If the unit cell length of sodium chloride crystal is 600pm, then its density will be

(A) 2.165gm/cm3

(B) 3.247gm/cm3

(C) 1.79 gm/cm3

(D) 1.082 gm/cm3

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Ans: (C)

Q:7. In a cubic packed structure of mixed oxides, the lattice is made up of oxide ions, one fifth of tetrahedral voids are occupied by divalent (X++) ions, while one-half of the octahedral voids are occupied by trivalent ions (Y+++), then the formula of the oxides.

(A) XY2O4

(B) X2YO4

(C) X4Y5O10

(D) X5Y4O10

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Ans: (C)

Q:8. If three elements X, Y & Z crystallized in cubic solid lattice with X atoms at corners, Y atoms at cube centre & Z-atoms at the edges, then the formula of the compound is:

(A) XYZ

(B) XY3Z

(C) XYZ3

(D)X3YZ

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Ans: (C)

Q:9. A compound XY crystallizes in bcc lattice with unit cell edge-length of 480pm, if the radius of Y is 225 pm, then the radius of X+ is­

(A) 190.70pm

(B) 225pm

(C) 127.5pm

(D) None

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Ans: (A)

Q:10. If the edge-length of the unit cell of Sodium chloride is 600pm, and the ionic radius of Cl ion is 190pm, then the ionic radius of Na+ ion is

(A) 310pm

(B) 110pm

(C) 220pm

(D) None

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Ans: (B)

Q:11. In a solid lattice the cation and anion both have left a lattice site. The lattice defect is known as.

(A) interstitial defect

(B) valency defect

(C) frenkel defect

(D) schottky defect

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Ans: (D)

Q:12. The number of tetrahedral and octahedral voids in hexagonal primitive unit cell are

(A) 8,4

(B) 2,1

(C) 12,6

(D) 6,12

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Ans: (C)

Q:13. The rank of atoms in the hexagonal until cell is

(A) 4

(B) 3

(C) 5

(D) 6

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Ans: (D)

Q: 14. The structure of CsCl Crystal is

(A) bcc lattice

(B) fcc lattice

(D) Octahedral

(D) None

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Ans: (A)

Q:15. In hexagonal primitive unit cell, the Corner is shared by

(A) 4 Unit cells

(B) 6-unit cells

(C) 3 unit cells

(D) 5 unit cells

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Ans: (B)

Q:16. An alloy of copper, silver and gold is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centres and gold is present at body centre, the alloy has a formula.

(A) Cu4Ag2Au

(B) Cu4Ag4Au

(C) Cu4Ag3Au

(D) CuAgAu

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Ans: (C)

Q:17. A substance has density of 2 kg dm-3 & it crystallizes to fcc lattice with edge-length equal to 700 pm, then the molar mass of the substance is

(A) 74.50 gm mol-1

(B) 103.30 gm mol-1

(C) 56.02 gm mol-1

(D) 65.36 gm mol-1

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Ans: (B)

Q:18. A common example of spinel strcuture is

(A) Fe2O3

(B) FeO

(C) Fe3O4

(D) FeCl3

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Ans: (C)

Q:19. In closest packing of atoms

(A)The size of tetrahedral void is greater than that of the octahedral void.

(B)The size of the tetrahedral void is smaller than that of the octahedral void.

(C)The size of tetrahedral void is equal to that of the octahedral void.

(C)The size of tetrahedral void may be larger or smaller or equal to that of the octahedral void depending upon the size of atoms.

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Ans: (B)

Q:20. If a be the edge-length of the unit cell, r be the radius of an atom, then for face centered cubic lattice, the correct relation is

(A) 4r = √3 a

(B) 4r = √2 a

(C) 4a = √3 r

(D) None

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Ans: (B)

Q:21. When an ion leaves its correct lattice site and occupies interstitial sites in its crystal lattice, it is called

(A) Crystal defect

(B) Frenkel defect

(C) Schottky defect

(D) None

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Ans: (B)

Q:22. The 8 : 8 type of packing is present in ?

(A) CsCl

(B) KCl

(C) NaCl

(D) MgF2

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Ans: (A)

Q:23. A face centre atom corner atom in the hexagonal unit cell structure is shared with

(A) 4-unit cells

(B) 3-unit cells

(C) 6-unit cells

(D) None

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Ans: (C)

Q: 24. KBr shows, which of the following defects ?

(A) Frenkel defect

(B) Schottky defect

(C) Metal excess defeat

(D) Metal deficiency

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Ans: (B)

Q:25. If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is sp3 what fractions of void are occupied by carbon atom.

(A) 25% Tetrahedral

(B) 50% Tetrahedral

(C) 25% Octahedral

(D) 50% Octahedral

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Ans: (D)

Q:26. Which of the following doesn’t crystallise in the rock-salt structure ?

(A) NaCl

(B) KCl

(C) MgCl2

(D) CsCl

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Ans: (D)

Click to See All Answers :
1. (A) 2. (B) 3. (C) 4. (C) 5 (A) 6. (C) 7. (C) 8. (C) 9. (A) 10. (B) 11. (D) 12. (C) 13. (D)

14. (A) 15. (B) 16. (C) 17. (B) 18. (C) 19. (B) 20. (B) 21. (B) 22. (A) 23. (C) 24. (B) 25. (D) 26. (D)