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Q. No.Solid A is a very hard electrical insulator in solid as well as in molten state and melts at extremely high temperature. Such type of solid is known as -
1. Covalent or network solid
2. Ionic solids
3. Non polar molecular solid
4. Metallic solids
Subtopic: Introduction & Crystal System |
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Ionic solids conduct electricity in molten state but not in solid state because-
| 1. | In molten state, electricity is conducted by ions |
| 2. | In molten state, electricity is conducted by free electrons |
| 3. | In molten state, electricity is conducted by Pie electrons |
| 4. | None of the above |
Subtopic: Introduction & Crystal System |
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Conductor, malleable and ductile solid among the following is -
1. Covalent or Network Solids
2. Molecular Solids
3. Metallic Solids
4. Ionic Solids
1. Covalent or Network Solids
2. Molecular Solids
3. Metallic Solids
4. Ionic Solids
Subtopic: Introduction & Crystal System |
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The significance of a ‘lattice point’ is-
| 1. | Each lattice point represents octahedral void |
| 2. | Generally, each lattice point represents one unit cell in a solid |
| 3. | Each lattice point represents one constituent particle of a solid |
| 4. | Each lattice point represents tetrahedral void |
Subtopic: Introduction & Crystal System |
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The characteristic parameter of a unit cell is-
1. Angles between the edges
2. Dimensions along the three side, a, b, and c
3. length along X axis
4. length along Y axis
1. Angles between the edges
2. Dimensions along the three side, a, b, and c
3. length along X axis
4. length along Y axis
Subtopic: Introduction & Crystal System |
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Match the items in column I with the items in column II.
| Column I | Column II |
| a. Hexagonal unit cells | i. a ≠ b ≠ c and α=γ=90°β≠90° |
| b. Face-centred unit cells | ii. 2 atoms per unit cells |
| c. Monoclinic unit cells | iii. 4 atoms per unit cell |
| d. End-centred unit cells |
iv. a = b ≠ c and α = β = 90° γ = 120° |
1. a-iv; b-ii; c-i, d-iii
2. a-ii; b-i; c-iv, d-iii
3. a-iv; b-iii; c-i, d-ii
4. a-iii; b-iv; c-i, d-ii
Subtopic: Introduction & Crystal System |
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The contribution (per unit cell) of an atom located at (i) corner and (ii) body-centre of a cubic unit cell respectively is :
1. 8 , 1
2. 1/8 , 1
3. 1/2 , 1/4
4. 1/4 , 1
1. 8 , 1
2. 1/8 , 1
3. 1/2 , 1/4
4. 1/4 , 1
Subtopic: Introduction & Crystal System |
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The two dimensional coordination number of a molecule in square close packed layer is-
1. 4
2. 6
3. 5
4. 2
1. 4
2. 6
3. 5
4. 2
Subtopic: Introduction & Crystal System |
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The total number of tetrahedral voids in 0.5 mol compound in hexagonal close-packed structure is-
1. 4.022 ×1022
2. 5.022 ×1023
3. 6.022 ×1023
4. 5.022 ×1022
1. 4.022 ×1022
2. 5.022 ×1023
3. 6.022 ×1023
4. 5.022 ×1022
Subtopic: Voids, Radius Ratio & Coordination Number |
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A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rd of tetrahedral voids. The formula of the compound is-
1. M3 N2
2. M2 N3
3. MN3
4. MN
1. M3 N2
2. M2 N3
3. MN3
4. MN
Subtopic: Voids, Radius Ratio & Coordination Number |
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