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Assignment for Class 12 Chemistry Unit 01 The Solid State
Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 01 The Solid State in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks
Unit 01 The Solid State Class 12 Chemistry Assignment
8. Define the term 'amorphous'. Give a few examples of amorphous solids.
An amorphous solid consists of particles of irregular shape. The arrangement of constituent particles
(atoms, molecules or ions) in such a solid has only short range order. Glass, rubber and plastics are typical examples of amorphous solids. 9
(ii) What is the coordination number of atoms: (a) in a cubic close-packed structure?
(b) in a body-centred cubic structure?
(i) The number of immediate neighbouring atoms with which each atom is in contact with is known as co-ordination number.
(ii) a) in a cubic close-packed structure the coordination number is 12
b) in a body-centred cubic structure the coordination number is 8
10 How will you distinguish between the following pairs of terms?
(i) Crystal lattice and unit cell?
(ii) Tetrahedral void and octahedral void?
(i) a regular three dimensional arrangement of points in space is called a crystal lattice. Unit cell is the smallest portion of a crystal lattice which, when repeated in different directions, generates the entire lattice. (ii
Tetrahedral void Octahedral void
1.it is a void formed when 4 spheres
(3 in one layer and 1 in next layer) are joined together.
2. Its co-ordination number is 4.
3.its radius is 0.225R where R is the radius of the close packed sphere
4. Tetrahedral void is much smaller than
octahedral void
1.it is a void formed when 6 spheres
(3 in one layer and 3 in next layer) are joined together.
2. Its co-ordination number is 6.
3.its radius is 0.414R where R is the radius of the close packed sphere
4. Octahedral void is much bigger than tetrahedral void.
11. What is a semiconductor? Describe the two main types of semiconductors and contrast their conduction mechanism.
Question. The fcc crystal contains how many atoms in each unit cell?
(a) 6
(b) 8
(c) 4
(d) 5.
Answer : C
Question. The number of atoms contained in a fcc unit cell of a monatomic substance is
(a) 1
(b) 2
(c) 4
(d) 6
Answer : C
Question. The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming
(a) allotropic crystals
(b) liquid crystals
(c) isomeric crystals
(d) isomorphous crystals.
Answer : B
Question. Glass is a
(a) liquid
(b) solid
(c) supercooled liquid
(d) transparent organic polymer.
Answer : C
Question. Most crystals show good cleavage because their atoms, ions or molecules are
(a) weakly bonded together
(b) strongly bonded together
(c) spherically symmetrical
(d) arranged in planes.
Answer : D
Question. The ability of a substance to assume two or more crystalline structures is called
(a) isomerism
(b) polymorphism
(c) isomorphism
(d) amorphism
Answer : B
Question. Cation and anion combines in a crystal to form following type of compound
(a) ionic
(b) metallic
(c) covalent
(d) dipole-dipole.
Answer : A
Question. For two ionic solids CaO and KI, identify the wrong statement among the following.
(a) CaO has high melting point.
(b) Lattice energy of CaO is much larger than that of KI.
(c) KI has high melting point.
(d) KI is soluble in benzene
Answer : D
Question. For orthorhombic system axial ratios are a ≠ b ≠ c and the axial angles are
(a) α = β = γ ≠ 90º
(b) α = β = γ = 90º
(c) α = γ = 90º, β ≠ 90º
(d) α ≠ β ≠ γ ≠ 90º
Answer : B
Question. The number of carbon atoms per unit cell of diamond unit cell is
(a) 6
(b) 1
(c) 4
(d) 8
Answer : D
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CBSE Class 12 Chemistry Unit 01 The Solid State Assignment
We hope you liked the above assignment for Unit 01 The Solid State which has been designed as per the latest syllabus for Class 12 Chemistry released by CBSE. Students of Class 12 should download and practice the above Assignments for Class 12 Chemistry regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 12 Chemistry practice sheet in Pdf. All questions have been designed for Chemistry by looking into the pattern of problems asked in previous year examinations. You can download all Revision notes for Class 12 Chemistry also absolutely free of cost. Lot of MCQ questions for Class 12 Chemistry have also been given in the worksheets and assignments for regular use. All study material for Class 12 Chemistry students have been given on studiestoday. We have also provided lot of Worksheets for Class 12 Chemistry which you can use to further make your self stronger in Chemistry.
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