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Solid state class 12 chemistry chapter 1 exercise solutions
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Solid state class 12 chemistry chapter 1 exercise solutions
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Class 12
Chemistry
1. SOLID STATE
Exercise solutions
By: solutions made easy
Solid State Class 12 Exercise Answer | Chemistry Class 12 Exercise Solution in Hindi |
12th Standard |New Syllabus| Chemistry Ch.1 Solid State Exercise
Solved Exercise ch-1 Solid state class 12 science new syllabus maharashtra board 2021 HSC MCQ Quest.
answers are as follows.....
1. Choose the most correct answer.
i. Molecular solids are
a. crystalline solids. b. amorphous solids
c. ionic solids. d. metallic solids
Answer: b. amorphous solids
ii.Which of the follwong is n-type semiconductor?
a. Pure Si. b. Si doped with As
c. Si doped with Ga. d. Ge doped with In
Answer: b. Si doped with As
iii. In Frenkel defect
a. electrical neutrality of substance is changed.
b. density of the substance is changed.
c. both cation and anion are missing
d. overall electical neutrality is preserved.
Answer:
(d) overall electrical neutrality is preserved
iv. In crystal lattice formed by bcc unit cell the void volume is.
a. 68 % b. 74 %
c.32 % d. 26 %
Answer: (c) 32%
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v. The coordination number of atoms in bcc crystal lattice is
a. 2. b. 4
c. 6. d. 8
Answer: (d) 8
vi. Which of the following is not correct?
a.Four spheres are involved in the formation of tetrahedral void.
b. The centres of spheres in octahedral voids are at the apices of a regular tetrahedron.
c.If the number of atoms is N the number of octahedral voids is 2N.
d. If the number of atoms is N/2, the number of tetrahedral voids is N.
Answer: (c) If the number of atoms is N the number of octahedral voids is 2N.
vii. A compound forms hcp structure. Number of octahedral and tetrhedral voids in 0.5 mole of substance is respectively
a. 3.011×10²³, 6.022×10²³
b. 6.022×10²³, 3.011×10²³
c. 4.011×10²³, 2.011×10²³
d. 6.011×10²³, 12.022×10²³
Answer: a. 3.011×10²³, 6.022×10²³
Solutions made easy
viii. Pb has fcc structure with edge length of unit cell 495 pm. Radius of Pb atom is
a. 205 pm. b. 185 pm
c. 260 pm. d. 175 pm
Answer: (d) 175 pm
2. Answer the following in one or two sentences
i. What are the types of particles in each of the four main classes of crystalline solids ?
Answer:
The smallest constituents or particles of various solids are atoms, ions or molecules.
ii. Which of the three types of packing used by metals makes the most efficient use of space and which makes the least efficient use?
Answer:
fcc has the most efficient packing of particles while scc has the least efficient packing.
iii. The following pictures show population of bands for materials having different electrical properties. Classify them as insulator, semiconductor or a metal.
Answer:
Picture A represents metal conductor,
Picture B represents insulator,
Picture C represents semiconductor.
iv. What is the unit cell?
Answer:
Unit cell : It is the smallest repeating structural unit of a crystalline solid (or crystal lattice) which when repeated in different directions produces the crystalline solid (lattice).
v. How does electrical conductivity of a semiconductor change with temperature? Why?
Answer:
• Since the energy difference between valence band and conduction band in semiconductor is not large, the electrons from valence band can be promoted to conduction by heating.
• Hence electrical conductivity of a semiconductor increases with temperature.
Solutions made easy
vi. The picture represents bands of MOs for Si. Label valence band, conduction band and band gap.
Answer:
ix. Sketch a tetrahedral void
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#practical # maharashtraboard # class11 #class12
Class 12
Chemistry
1. SOLID STATE
Exercise solutions
By: solutions made easy
Solid State Class 12 Exercise Answer | Chemistry Class 12 Exercise Solution in Hindi |
12th Standard |New Syllabus| Chemistry Ch.1 Solid State Exercise
Solved Exercise ch-1 Solid state class 12 science new syllabus maharashtra board 2021 HSC MCQ Quest.
answers are as follows.....
1. Choose the most correct answer.
i. Molecular solids are
a. crystalline solids. b. amorphous solids
c. ionic solids. d. metallic solids
Answer: b. amorphous solids
ii.Which of the follwong is n-type semiconductor?
a. Pure Si. b. Si doped with As
c. Si doped with Ga. d. Ge doped with In
Answer: b. Si doped with As
iii. In Frenkel defect
a. electrical neutrality of substance is changed.
b. density of the substance is changed.
c. both cation and anion are missing
d. overall electical neutrality is preserved.
Answer:
(d) overall electrical neutrality is preserved
iv. In crystal lattice formed by bcc unit cell the void volume is.
a. 68 % b. 74 %
c.32 % d. 26 %
Answer: (c) 32%
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v. The coordination number of atoms in bcc crystal lattice is
a. 2. b. 4
c. 6. d. 8
Answer: (d) 8
vi. Which of the following is not correct?
a.Four spheres are involved in the formation of tetrahedral void.
b. The centres of spheres in octahedral voids are at the apices of a regular tetrahedron.
c.If the number of atoms is N the number of octahedral voids is 2N.
d. If the number of atoms is N/2, the number of tetrahedral voids is N.
Answer: (c) If the number of atoms is N the number of octahedral voids is 2N.
vii. A compound forms hcp structure. Number of octahedral and tetrhedral voids in 0.5 mole of substance is respectively
a. 3.011×10²³, 6.022×10²³
b. 6.022×10²³, 3.011×10²³
c. 4.011×10²³, 2.011×10²³
d. 6.011×10²³, 12.022×10²³
Answer: a. 3.011×10²³, 6.022×10²³
Solutions made easy
viii. Pb has fcc structure with edge length of unit cell 495 pm. Radius of Pb atom is
a. 205 pm. b. 185 pm
c. 260 pm. d. 175 pm
Answer: (d) 175 pm
2. Answer the following in one or two sentences
i. What are the types of particles in each of the four main classes of crystalline solids ?
Answer:
The smallest constituents or particles of various solids are atoms, ions or molecules.
ii. Which of the three types of packing used by metals makes the most efficient use of space and which makes the least efficient use?
Answer:
fcc has the most efficient packing of particles while scc has the least efficient packing.
iii. The following pictures show population of bands for materials having different electrical properties. Classify them as insulator, semiconductor or a metal.
Answer:
Picture A represents metal conductor,
Picture B represents insulator,
Picture C represents semiconductor.
iv. What is the unit cell?
Answer:
Unit cell : It is the smallest repeating structural unit of a crystalline solid (or crystal lattice) which when repeated in different directions produces the crystalline solid (lattice).
v. How does electrical conductivity of a semiconductor change with temperature? Why?
Answer:
• Since the energy difference between valence band and conduction band in semiconductor is not large, the electrons from valence band can be promoted to conduction by heating.
• Hence electrical conductivity of a semiconductor increases with temperature.
Solutions made easy
vi. The picture represents bands of MOs for Si. Label valence band, conduction band and band gap.
Answer:
ix. Sketch a tetrahedral void
Class 12th chemistry chapter 1 exercise solutions
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Class 12 chemistry chapter 1 solid state exercise class 12 chemistry solutions
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