NEET Questions Solved


What type of crystal defects is indicated in the diagram given below?

(a) Frenkel and Schottky defects
(b) Schottky defect
(c) Interstitial defect
(d) Frenkel defect

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Frenkel defect is noticed in:

(a) AgBr

(b) ZnS

(c) Agl

(d) all of these

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Choose the correct matching sequence from the possibilities given

(a) Crystal defect         (1) AB AB AB. . . . type crystal
(b) hcp                        (2) Covalent crystal
(c) CsCl                      (3) Frenkel
(d) Diamond               (4) Face centered in cube
(e) NaCl                     (5) Body centered in cube
     
     (a) (b) (c) (d) (e)

(A)  3   1   2    5    4

(B) 3    1   5   2     4

(C) 3    5   1   2     4

(D) 5    3  4   2      1

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Frenkel defect is not found in the halides of alkali metals because alkali metals have

1. high electropositivity
2. high ionic radii
3. high reactivity
4. ability to occupy interstitial sites

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Schottky defect occurs mainly in electrovalent compound where 

1. Positive ions have large sizes

2. Negative ions have small sizes

3. Positive and negative ions are of similar size

4. Positive ions are big and negative ions are small

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The appearance of colour in solid alkali metal halides is generally due to :-

1. Frankel Defect
2. Interstitial Defect
3. F-Centres
4. Schottky Defect

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Which is the incorrect statement?

(a) FeO0.98 has non-stoichiometric metal excess defect

(b) Density decreases in case of crystals with Schottky's defect

(c) NaCI(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal

(d) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal

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The correct statement regarding defects in the crystalline solid is

(a) Schottky defects have no effect on the density of crystalline solids

(b) Frenkel defects decreases the density of crystalline solids

(c) Frenkel defcct is a dislocation defect

(d) Frenkel defect is found in halides of alkaline metals

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The appearance of colour; in solid alkali metal halides is generally due to:-

(a) F-centres
(b) Schottky defect
(c) Frenkel defect
(d) interstitial positions

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Analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.

                                                                                                              1mark

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