Class 12th chemistry chapter – 1 most vvi objective for Bihar board and all other board
Solid State
1. how many kinds of space lattices are possible in a crystal
(A) 23 (B) 7
(C) 230 (D) 14
Ans- D
2. Co – ordination number of solid iron Na + in
(A) Four (B) Three
(C) Six. (D) Five
Ans- C
3. Which of the following is non -crystalline solid ?
(A) Diamond. (B) Graphite
(C) Glass. (D) Common salt
Ans – C
4. Which of the following is characteristic not possessed by crystalline solid ?
(A) Isotropic (B) Sharp melting point
(C) Definite geometrical shape
(D) Strong intermolecular force
Ans – A
5. Number of basic type of crystals are :
(A) 4. (B) 7
(C) 14. (D) 8
Ans – B
Inter chemistry solid state most VVI Objective
6. NaCl crystal structure is :
(A). Body – centred (B) Face – centred
(C) Tetragonal. (D) Simple cube
Ans – B
7. Number of atoms in body -centred cube unit cell is :
(A) 4 (B) 2
(C) 8. (D) 9
Ans – B
8. In body – centred cubic crystal structure co-ordinational number of atom is :
(A) 4 (B) 2
(C) 8 (D) 12
Ans – C
9. What is the ratio of octahedral void ?
(A) 0.414 (B) 0.225
(C) 2.25 (D) 4.14
Ans – A
10.how many octahedral sites per sphere are there in a cubic close packed structure :
(A) Four (B) Two
(C) One (D) Six
Ans – C
11. The number of tetrahedral and octahedral holes in a CCP array of 100 atoms are respectively :
(A) 200 and 100 (B) 100 and 200
(C) 200 and 100 (D) 100 and 100
Ans – A
12. Copper crystallises in fcc form and sodium in a bcc form. The coordination number of Cu and Na are respectively.
(A) 12 and 12 (B) 12 and 8
(C) 8 and 12 (D) 6 and 8
Ans – B
13. Silicon that has been doped with group 15 elements is called :
(A) p-type semiconductor
(B) n-type semiconductor (C) electron vacancy or hole
(d) e-type semiconductor
Ans – B
14. In diamond, the coordination number of carbon is :
(A) For and it’s unit cell has eight carbon atom
(B) For an its unit cell has six carbon atoms
(C) Six and its unit cell has four carbon atom
(D) Four and its unit cell has four carbon atom
Ans – A
15. The co-ordinator number of a metal crystallizing in a hexagonal close packing structure is :
(A) 12. (B) 4
(C) 8. (D) 6
Ans – A
Inter chemistry solid state most VVI Objective
16. In which of the following crystals alternate tetrahedral voids are occupied ?
(A)NaCl (B) ZnS
(C) CaF2 (D) Na2O
Ans – B
17. Schottky defect in Crystals is observed when :
(A) Equal number of cations and anions are missing From the lattice
(B) Equal number of cations and anions are missing from the lattice
(C) An ion leaves it’s normal site and occupies an interstitia site
(D) Density of the crystal is increased
Ans – B
18 . Frenkel and Schottky defects are :
(A) Nucleous defects (B) Atomic defects
(C) Crystal defects (D) Molecular defects
Ans – C
19. Glass is a :
(A) Micro-crystallines
(B) Supper-cooled liquid
(C) Gel
(D) Polymeric mixture
Ans – B
20. Increase in temperature of crystalline compound result in :
(A) Increase in co-ordination number
(B) Decrease in co-ordination number
(C) Decomposition of the compound
(D) None of these
Ans – B
Inter chemistry solid state most VVI Objective
21. A Match box exhibits :
(A) Cubic geometry
(B) Monoclinic geometry
(C) Tetragonal geometry
(D) Orthorhombic geometry
Ans – B
22. Which of the following statement is true in the rock-salt structure of an ionic compound ?
(A) Coordination number of cation is for where as that of anions is six
(B) Coordination number of cation is six where as that of union is four
(C) Coordination number of each cation and anion is four
(D) Coordination number of each cation and anion is six
Ans – D
23. Molecular solids are usually :
(A) Good electrical contractors
(B) Quite hard
(C) Quite brittle
(D) Volatile
Ans – D
24. The factor which makes a solid to have a low density is :
(A) Close packing
(B) High atomic mass
(C) High occupancy of tetrahedral
(D) large atomic radius
Ans – D
25. The unit cell present in the crystals lattice of diamond is :
(A) Cube. (B) Tetragonal
(C) Hexagonal. (D) Trigonal
Ans – A