1.

    A crystal of NaCl is doped with SrCl2_2. What type of defect is created and what is the effect on density?

    A

    Schottky defect, density decreases

    B

    Frenkel defect, density increases

    C

    Cation vacancy defect, density decreases

    D

    Anion vacancy defect, density increases

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Non-Stoichiometric Defects, Metal Excess Defect, Doping, Crystal Density

    Related Questions

    1.

    Among the following types of voids, which one is the largest void?

    A

    Tetrahedral

    B

    Octahedral

    C

    Cubic

    D

    Triangular

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Crystal Structures, Voids, Packing Efficiency

    2.

    The ABAB.....ABAB..... packing and ABCABC.....ABCABC..... packing are respectively called

    A

    HCP  and  CCPHCP\,\,and\,\,CCP

    B

    CCP  and  HCPCCP\,\,and\,\,HCP

    C

    BCC  and  HCPBCC\,\,and\,\,HCP

    D

    HCP  and  BCCHCP\,\,and\,\,BCC

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Crystal Structures, Packing Efficiency, HCP, CCP

    3.

    In a crystalline solid exhibiting a Schottky defect, what remains unchanged?

    A

    Density

    B

    Mass

    C

    Electrical neutrality

    D

    Volume

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    PYQ YEAR: 2015
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Solid State, Defects in Solids

    4.

    When electrons are trapped into the crystal in anion vacancy, the defect is known as :

    A

    Schottky defect

    B

    Frenkel defect

    C

    Stoichiometric defect

    D

    F-centres

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :crystal defects, anion vacancy, F-centers

    5.

    If NaCl{\rm{NaCl}} is dopped with 10βˆ’4 {10^{ - 4}} mole % of SrCl2{\rm{SrC}}{{\rm{l}}_2} the concentration of cation vacancies will be:

    A

    6.02x1016β€…β€Šmolβˆ’16.02{\rm{x}}{10^{16}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    B

    6.02x1017β€…β€Šmolβˆ’16.02{\rm{x}}{10^{17}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    C

    6.02x1014β€…β€Šmolβˆ’16.02{\rm{x}}{10^{14}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    D

    6.02x1015β€…β€Šmolβˆ’16.02{\rm{x}}{10^{15}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Solid-state chemistry, Doping, Cation vacancies, Avogadro's number, Stoichiometry

    6.

    Density of a crystal remains unchanged as a result of

    A

    Ionic defect

    B

    Schottky defect

    C

    Frenkel defect

    D

    Crystal defect

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Crystal defects, Density, Frenkel defect, Schottky defect

    7.

    The electrical conductivity of a non-stoichiometric metal oxide increases with:

    A

    Decrease in temperature

    B

    Increase in the extent of non-stoichiometry

    C

    Decrease in the extent of non-stoichiometry

    D

    Introduction of impurities with the same oxidation state

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Non-Stoichiometric Defects, Electrical Conductivity

    8.

    Metal excess defects due to anion vacancies result in:

    A

    F-centres

    B

    Interstitial defects

    C

    Substitutional defects

    D

    No change in color

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :0.5 mins
    πŸ”„Ncert Concepts :Metal Excess Defects, F-Centres, Crystal Defects

    9.

    If NaCl{\rm{NaCl}} is dopped with 10βˆ’4 {10^{ - 4}} mole % of SrCl2{\rm{SrC}}{{\rm{l}}_2} the concentration of cation vacancies will be:

    A

    6.02x1016β€…β€Šmolβˆ’16.02{\rm{x}}{10^{16}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    B

    6.02x1017β€…β€Šmolβˆ’16.02{\rm{x}}{10^{17}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    C

    6.02x1014β€…β€Šmolβˆ’16.02{\rm{x}}{10^{14}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    D

    6.02x1015β€…β€Šmolβˆ’16.02{\rm{x}}{10^{15}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Solid State Chemistry, Doping, Cation Vacancies, Mole Percent, Avogadro's Number

    10.

    Which of the following has highest value of energy gap?

    A

    Aluminum

    B

    Silver

    C

    Germanium

    D

    Diamond

    Question Tags
    πŸ“š Subject:Chemistry
    πŸ“‘ Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Energy gap, Semiconductors, Insulators, Conductors

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