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Q. No.The ionic solid among the following, that has anionic vacancy due to metal excess, defect and develop color is-
1. KCl
2. NaCl
3. TiO
4. All of the above
Subtopic: Imperfections in Solids & Semiconductors |
74%
Level 2: 60%+
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A group 14 element is converted into n-type semiconductor by doping it with :
1. Boron
2. Aluminium
3. Phosphorous
4. All of the above.
Subtopic: Imperfections in Solids & Semiconductors |
76%
Level 2: 60%+
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Substances used for making permanent magnets are :
1. Ferrimagnetic
2. Ferromagnetic
3. Antiferromagnetic
4. Both (1) and (3)
1. Ferrimagnetic
2. Ferromagnetic
3. Antiferromagnetic
4. Both (1) and (3)
Subtopic: Imperfections in Solids & Semiconductors |
78%
Level 2: 60%+
Hints
Match the items in column I with the items in column II.
1. a-iv; b-iii; c-i, d-ii
2. a-ii; b-i; c-iv, d-iii
3. a-iv; b-ii; c-iv, d-i
4. a-iii; b-iv; c-i, d-ii
| Column I | Column II |
| a. Tin | i. Polar molecular solid |
| b. Urea | ii. Metallic solid |
| c. Zinc sulphide | iii. Covalent or network solid |
| d. Silicon carbide | iv. Ionic solid |
1. a-iv; b-iii; c-i, d-ii
2. a-ii; b-i; c-iv, d-iii
3. a-iv; b-ii; c-iv, d-i
4. a-iii; b-iv; c-i, d-ii
Subtopic: Introduction & Crystal System |
87%
Level 1: 80%+
Hints
When a cation of higher valency is added as an impurity in an ionic solid, then :
1. Vacancies are created .
2. Stoichiometry remains unaffected.
3. Excess of metal ions is created.
4. Both (2) and (3)
1. Vacancies are created .
2. Stoichiometry remains unaffected.
3. Excess of metal ions is created.
4. Both (2) and (3)
Subtopic: Imperfections in Solids & Semiconductors |
Level 3: 35%-60%
Hints
| Statement 1: | ZnS shows Frenkel defect. |
| Statement 2: | AgBr shows Frenkel as well as Schottky defect. |
1. Statement 1 is true , statement 2 is false.
2. Statement 1 is false , statement 2 is true.
3. Both statements are true.
4. Both statements are false.
Subtopic: Imperfections in Solids & Semiconductors |
84%
Level 1: 80%+
Hints
Heating of a solid favour the -
1. Metal deficiency defect
2. Impurity defects
3. Vacancy defect
4. None of the above
1. Metal deficiency defect
2. Impurity defects
3. Vacancy defect
4. None of the above
Subtopic: Imperfections in Solids & Semiconductors |
61%
Level 2: 60%+
Hints
An element with molar mass 2.7 × 10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7 × 103 kg m−3, then the nature of the cubic unit cell is-
1. Face-centred cubic
2. Body-centered cubic
3. End-Centred cubic
4. None of the above
1. Face-centred cubic
2. Body-centered cubic
3. End-Centred cubic
4. None of the above
Subtopic: Density & Packing Fraction |
71%
Level 2: 60%+
Hints
The lattices has the highest packing efficiency among the following is-
1. Simple cubic
2. Body-centred cubic
3. Hexagonal close-packed lattice
4. None of the above
Subtopic: Density & Packing Fraction |
86%
Level 1: 80%+
Hints
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 |
78%
Level 2: 60%+
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