12th Chemistry chapter 1 Bihar board with NCERT-Details & Highlights
| name of content | 12th Chemistry chapter 1 full solution |
| content | Chemistry objective type MCQ question with answer |
| name of subjects | class 12 Chemistry |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th Chemistry chapter 1 all objective solutions – download PDF
1. Which one of the following is non-crystalline or amorphous?
-
- (a) Diamond
- (b) Graphite
- (c) Glass
- (d) Common Salt
Ans (c)
2. NaCl typecrystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying
-
- (a) high temperature
- (b) high pressure
- (c) high temperature and high pressure
- (d) low temperature and low pressure
Ans (b)
3. How many chloride ions are surrounding sodium ion in sodium chloride crystal ?
-
- (a) 4
- (b) 8
- (c) 6
- (d) 12
Ans (c)
4. In NaCl structure
-
- (a) all octahedral and tetrahedral sites are occupied
- (b) only octahedral sites are occupied
- (c) only tetrahedral sites are occupied
- (d) neither octahedral nor tetrahedral sites are occupied
Ans (b)
5. In Zinc blende structure
-
- (a) zinc ions occupy half of the tetrahedral sites
- (b) each Zn2- ion is surrounded by six sulphide ions
- (c) each S2- ion is surrounded by six Zn2+ ions
- (d) it has fee structure
Ans (c)
6. A unit cell of BaCl2(fluorite structure) is made up of
-
- (a) four Ba2+ ions and four Cl– ions
- (b) four Ba2- ions and eight Cl– ions
- (c) eight Ba² ions and four Cl– ions
- (d) four Ba² ions and six Cl– ions
Ans (b)
7. Alkali halids do not show Frenkel defect because
-
- (a) cations and anions have almost equal size
- (b) there is a large difference in size of cations and anions
- (c) cations and anions have low coordination number
- (d) anions cannot be accommodated in voids
Ans (a)
8. The coordination number of Y will be in the XY types of crystal:
-
- (a) 6
- (b) 8
- (c) 12
- (d) 4
Ans (a)
9. Edge length of unit cell of chromium metal is 287 pm with bcc arrangement. The atomic radius is of the order
-
- (a) 287 pm
- (b) 574 pm
- (c) 124.27 pm
- (d) 143.5 pm
Ans (c)
10. The edge length of fee cell is 508 pm. If radius of cation is 110 pm, the radius of anion is
-
- (a) 110 pm
- (b) 220 pm
- (c) 285 pm
- (d) 144 pm
Ans (d)
12th Chemistry chapter 1 full solution
11. The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1will be
-
- (a) 10 g cm-3
- (b) 14.2 g cm-3
- (c) 6.15 g cm-3
- (d) 9.3 2 g cm-3
Ans (c)
12. How many lithium atoms are present in a unit cell with edge length 3.5 Å and density 0.53 g cm-3? (Atomic mass of Li = 6.94):
-
- (a) 2
- (b) 1
- (c) 4
- (d) 6
Ans (a)
13. The distance between Na–and Cl– ions in NaCl with a density 2.165 g cm-3 is
-
- (a) 564 pm
- (b) 282 pm
- (c) 234 pm
- (d) 538 pm
Ans (b)
14. An element with atomic mass 100 has a bcc structure and edge length 400 pm. The density of element is
-
- (a) 10.37 g cm-3
- (b) 5.19 g cm-3
- (c) 7.29 g cm-3
- (d) 2.14 g cm-3
Ans (b)
15. Fe3O4 (magnetite) is an example of
-
- (a) normal spinel structure
- (b) inverse spinel structure
- (c) fluoride structure
- (d) anti fluorite structure
Ans (b)
16. Which of the following crystals does not exhibit Frenkel defect?
-
- (a) AgBr
- (b) AgCl
- (c) KBr
- (d) ZnS
Ans (c)
17. What type of stoichiometric defect is shown by ZnS?
-
- (a) Schottky defect
- (b) Frenkel defect
- (c) Both Frenkel and Schottky defects
- (d) Non-stoichiometric defect
Ans (b)
18. Silver halides generally show
-
- (a) Schottky defect
- (b) Frenkel defect
- (c) Both Frenkel and Schottky defects
- (d) cation excess defect
Ans (c)
19. Which of the following will have metal deficiency defect?
-
- (a) NaCl
- (b) FeO
- (c) KCl
- (d) ZnO
Ans (b)
20. In which pair most efficient packing is present?
-
- (a) hep and bcc
- (b) hep and ccp
- (c) bcc and ccp
- (d) bcc and simple cubic cell
Ans (b)
21. What is the effect of Frenkel defect on the density of ionic solids?
-
- (a) The density of the crystal increases
- (b) The density of the crystal decreases
- (c) The density of the crystal remains unchanged
- (d) There is no relationship between density of a crystal and defect present in it
Ans (c)
22. In a Schottky defect
-
- (a) an ion moves to interstitial position between the lattice points
- (b) electrons are trapped in a lattice site
- (c) some lattice sites are vacant
- (d) some extra cations are present in interstitial space
Ans (c)
bihar board 12th Chemistry chapter 1 notes
23. To get n-type of semiconductor, germanium should be doped with
-
- (a) gallium
- (b) arsenic
- (c) aluminium
- (d) boron
Ans (b)
24. p-type semiconductors are formed When Si or Ge are doped with
-
- (a) group 14 elements
- (b) group 15 elements
- (c) group 13 elements
- (d)group 18 elements
Ans (c)
25. Which of the following conditions favours the existence of a substance in the solid state?
-
- (a) High temperature
- (b) Low temperature
- (c) High thermal energy
- (d) Weak cohesive forces
Ans (b)
26. Which among the following will show anisotropy ?
-
- (a) Glass
- (b) NaBr
- (c) Plastic
- (d) Rubber
Ans (b)
27. Which of the following forms a molecular solid when solidified ?
-
- (a) Calcium fluoride
- (b) Silicon dioxide
- (c) Carbon dioxide
- (d) Sodium chloride
Ans (c)
28. The major binding force in diamond, silicon and quartz is ……………
-
- (a) electrostatic force
- (b) electrical attraction
- (c) covalent bond force
- (d) van der Waals force
Ans (c)
29. Solid X is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it ?
-
- (a) Ionic solid
- (b) Covalent solid
- (c) Metallic solid
- (d) Molecular solid
Ans (b)
30. Examples of few solids are given below. Find out the example which is not correctly matched.
-
- (a) Ionic solids – NaCl, ZnS
- (b) Covalent solids – H2,l2
- (c) Molecular solids – H2O(s)
- (d) Metallic solids – Cu, Sn
Ans (b)
31. Which of the following solids is the structure of CsCl crystal ?
-
- (a) Body centred cubic
- (b) Simple cubic
- (c) Face centred cubic
- (d) Edge centred cubic
Ans (a)
MCQ of 12th Chemistry chapter 1
32. Which of the following does not represent a type of crystal system ?
-
- (a) Triclinic
- (b) Monoclinic
- (c) Rhombohedral
- (d) Isotropical
Ans (d)
33. Which of the following primitive cells show the given parameters ?
-
- (a) Cubic
- (b) Tetragonal
- (c) Orthorhombic
- (d) Hexagonal
Ans (c)
34. Which type of crystals contains more than one Bravais lattice ?
-
- (a) Hexagonal
- (b) Triclinic
- (c) Rhombohedral
- (d) Monoclinic
Ans (d)
35. A metal crystallises into a lattice containing a sequence of layers as AB AB AB………………….. What percentage of voids are left in the lattice ?
-
- (a) 72%
- (b) 48%
- (c) 26%
- (d) 32%
Ans (c)
36. In ccp arrangement the pattern of successive layers can be designated as …………
-
- (a) AB AB AB
- (b) ABC ABC ABC
- (c) AB ABC AB
- (d) ABA ABA ABA
Ans (b)
37. The coordination number of metal crystallising in a hexagonal close packing is ………
-
- (a) 12
- (b) 4
- (c) 8
- (d) 6
Ans (a)
38. A crystalline structure has radius ratio (r, / r) in the range of 0.225 – 0.414. The coordination number and arrangement of anions around the cations are ………..
-
- (a) 3, plane triangular
- (b) 6, octahedral
- (c) 4, tetrahedral
- (d) 8, cubic
Ans (c)
39. A crystal lattice with alternative +ve and -ve ions has radius ratio 0.524. The coordination number of lattice is …………
-
- (a) 4
- (b) 6
- (c) 8
- (d) 12
Ans (b)
40. A solid AB has a rock salt structure. If radius of cation A+is 120 pm, what is the minimum value of radius of B+ anion
-
- (a) 120 pm
- (b) 240 pm
- (c) 290 pm
- (d) 360 pm
Ans (c)
BSEB 12th Chemistry chapter 1
41. How many chloride ions are surrounding sodium ion in sodium chloride crystal ?
-
- (a) 4
- (b) 8
- (c) 6
- (d) 12
Ans (c)
42. In NaCl structure, ……………
-
- (a) all octahedral and tetrahedral sites are occupied
- (b) only octahedral sites are occupied
- (c) only tetrahedral sites are occupied
- (d) neither octahedral nor tetrahedral sites are occupied.
Ans (b)
43. NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying ……
-
- (a) high temperature
- (b) high pressure
- (c) high temperature and high pressure
- (d) low temperature and low pressure.
Ans (b)
44. Coordination numbers of Cs+and Cl– in CsCl crystal are ………….
-
- (a) 8, 8
- (b) 4,4
- (c) 6,6
- (d) 8,4
Ans (a)
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Bihar board 12th Chemistry chapter 1 complete objective
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Bihar board 12th science stream subjects wise solution
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| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |
