- 1(current)
Q. No.Select the correct option based on statements below:
| Assertion (A): | In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells. |
| Reason (R): | In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality. |
| 1. | (A) is false but (R) is true. |
| 2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 4. | (A) is true but (R) is false. |
Subtopic: Â Imperfections in Solids & Semiconductors |
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which statements among the following is not correct?
| 1. | When conduction band and valence band overlap, a semiconductor is obtained |
| 2. | Ferrimagnetism arises due to the alignment of magnetic moments of the domains in the substance in parallel and anti-parallel directions in unequal numbers |
| 3. | Replacing some silicon atoms by boron atoms in crystal of silicon produces p-type semiconductor |
| 4. | Replacing some germanium atoms by phosphorus atoms in a crystal of germanium produces n-type semiconductor |
Subtopic: Â Imperfections in Solids & Semiconductors |
 72%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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Match List-I with List-II :
Choose the correct answer from the options given below:
| List-I (Defects) |
List-II (shown by) |
| (a) Frenkel defect | (i) non-ionic solids and density of the solid decreases. |
| (b) Schottky defect | (ii) non-ionic solids and density of the solid increases. |
| (c) Vacancy defect | (iii) ionic solids and density of the solid decreases. |
| (d) Interstitial defect |
(iv) ionic solids and the density of the solid remains constant. |
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (ii) | (iii) | (iv) |
| 2. | (i) | (iii) | (ii) | (iv) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iv) | (iii) | (i) | (ii) |
Subtopic: Â Imperfections in Solids & Semiconductors |
 73%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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A compounds that can show both, Frenkel as well as Schottky defects is -
1. AgBr
2. AgI
3. NaCl
4. ZnS
Subtopic: Â Imperfections in Solids & Semiconductors |
 87%
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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The incorrect statement among the following is -
| 1. | Density decreases in case of crystals with Schottky's defect. |
| 2. | NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal. |
| 3. | Frenkel defect is favoured in those ionic compounds in which sizes of cations and anions have large difference. |
| 4. | \(Fe_{0.98}O\) has non stoichiometric metal excess defect. |
Subtopic: Â Imperfections in Solids & Semiconductors |
 53%
From NCERT
NEET - 2017
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
The correct statement regarding defects in a crystalline solid is:
| 1. | Schottky defects have no effect on the density of crystalline solids. |
| 2. | Frenkel defects decrease the density of crystalline solids. |
| 3. | Frenkel defect is a dislocation defect. |
| 4. | Frenkel defect is found in halides of alkaline metals. |
Subtopic: Â Imperfections in Solids & Semiconductors |
 78%
From NCERT
NEET - 2015
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NEET 2023 - Target Batch - Aryan Raj Singh
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Silicon gives p-type of semiconductor on doping with:
1. Germanium.
2. Arsenic.
3. Selenium.
4. Boron.
Subtopic: Â Imperfections in Solids & Semiconductors |
 72%
From NCERT
AIPMT - 2008
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NEET 2023 - Target Batch - Aryan Raj Singh
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The appearance of colour in solid alkali metal halides is generally due to:
1. F-centres.
2. Schottky defect.
3. Frenkel defect.
4. Interstitial positions.
Subtopic: Â Imperfections in Solids & Semiconductors |
 81%
From NCERT
AIPMT - 2006
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NEET 2023 - Target Batch - Aryan Raj Singh
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Schottky defect shows:
| 1. | Same number of cation and anions decrease from lattice. |
| 2. | Cations and anions are replaced from their sites. |
| 3. | Maximum number of cations and anions are same. |
| 4. | None of the above. |
Subtopic: Â Imperfections in Solids & Semiconductors |
 81%
From NCERT
AIPMT - 1998
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
- 1(current)
Q. No.
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