Tag: the solid state

Questions Related to the solid state

Frenkel defect is noticed in 

imperfections in solids solid state the solid state chemistry

  1. $AgBr$

  2. $ZnS$

  3. $AgI$

  4. All

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Correct Option: D

Which of the following defect, if present, lowers the density of the crystal?

imperfections in solids solid state the solid state chemistry

  1. Frenkel

  2. Schottky

  3. Metal excess defect due to excess cation

  4. interstitial defect

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Correct Option: B

The schottky defect appears in

imperfections in solids solid state the solid state chemistry

  1. $NaCl$

  2. $CsCl$

  3. $AgBr$

  4. All

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Correct Option: D

The only incorrect effect on density by the given defect in solids is

imperfections in solids solid state the solid state chemistry

  1. Density must decrease by vacancy defect

  2. Density must increase by the interstitial defect

  3. Density must increase by impurity defect

  4. Density does not change by dislocation defect

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Correct Option: C

The intrinsic or thermodynamic defect is

imperfections in solids solid state the solid state chemistry

  1. Schottky defect

  2. Metal excess defect due to excess cation

  3. Metal excess defect due to anion vacancy

  4. Metal-deficient defect

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Correct Option: A

Give the correct order of initials T(true) or F(False) for following statements:
I. In an anti-fluorite structure, anions form FCC and cations occupy all the tetrahedral voids
II. If the radius of cation and anion is $20$ and $95$ pm, then the coordination number of the cation is the crystal is $4$.
III. An atom or ion is transferred from a lattice site to an interstitial position in Frenkel defect.
IV. The density of crystal always increases due to substitutional impurity defect.

imperfections in solids solid state the solid state chemistry

  1. TTTT

  2. FFFF

  3. FFTT

  4. TFTF

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Correct Option: D

Which of the following defects in the crystals may lower the density?

imperfections in solids solid state the solid state chemistry

  1. Interstitial defect

  2. Vacancy defect

  3. Schottky defect

  4. Impurity defect

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Correct Option: B,C

Which kind of defect is introduced by doping in silicon crystal?

imperfections in solids solid state the solid state chemistry

  1. Dislocation defect

  2. Schottky defect

  3. Frenkel defect

  4. Electronic defect

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Correct Option: D

Which of the following may have Frenkel defect?

imperfections in solids solid state the solid state chemistry

  1. Sodium chloride

  2. Zinc sulphate

  3. Silver bromide

  4. Diamond

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Correct Option: B,C

Which of the following statement(s) is/are incorrect regarding the defects in solids?

imperfections in solids solid state the solid state chemistry

  1. $AgBr$ crystal show both Schottky and Frenkel defect

  2. Impurity defect by doping of Arsenic in Silicon results n-type semiconductor

  3. Doping in crystal introduces dislocation defect

  4. Metal deficient defect can occur with extra anion present in the interstitial voids

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Correct Option: C,D