1.

    When NaCl is doped with MgCl2MgCl_2, the nature of the defect introduced and its effect on density are:

    A

    Anion vacancy, density increases

    B

    Interstitial cation, density increases

    C

    Cation vacancy, density decreases

    D

    Frenkel defect, density remains same

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Stoichiometric Defects, Density, Doping

    Related Questions

    1.

    In a face centred cubic arrangement off AA and BB atoms whose A atoms are at the corner of the unit cell and BB atoms at the face centres. One of the AA atom is missing from one corner in unit cell. The simplest formula of compound is :

    A

    A7B3{A_7}{B_3}

    B

    AB3A{B_3}

    C

    A7B24{A_7}{B_{24}}

    D

    A7/8B3{A_{7/8}}{B_3}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Solid State, Unit Cell, Face Centered Cubic, Stoichiometry

    2.

    Which is the incorrect statement

    A

    Every real number is a rational number

    B

    Every integer is a rational number

    C

    Every rational number is a real number

    D

    Every irrational number is a real number

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Schottky defect, Frenkel defect, Conductivity, Piezoelectricity, Non-stoichiometric defects

    3.

    In octahedral holes (voids)

    A

    a bi-triangular void surrounded by six spheres

    B

    a bi-triangular void surrounded by four spheres

    C

    a bi-triangular void surrounded by eight spheres

    D

    a simple triangular void surrounded by four spheres

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :crystal structures, octahedral voids, coordination number

    4.

    Density of a crystal remains unchanged as a result of

    A

    Ionic defect

    B

    Schottky defect

    C

    Frenkel defect

    D

    Crystal defect

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Understanding
    🎯Difficulty :Easy
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Crystal defects, Density, Frenkel defect, Schottky defect

    5.

    Which one of the following has Frenkel defect?

    A

    NaCl{\rm{NaCl}}

    B

    AgBr{\rm{AgBr}}

    C

    Graphite

    D

    Diamond

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Frenkel defect, ionic solids, crystal defects

    6.

    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
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :crystal defects, anion vacancy, F-centers

    7.

    Which of these compounds reacts only with bases and not with acids?

    A

    Na₂O

    B

    ZnO

    C

    SO₂

    D

    Al₂O₃

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    PYQ YEAR: 2017
    🎓 Ncert Level:Application
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Chemical Properties of Group 14 Elements, Acid-Base Reactions

    8.

    In an ionic compound AB, if equal numbers of A+A^{+} and B−B^{-} ions are missing from their lattice sites, what type of defect is present?

    A

    Frenkel defect

    B

    Schottky defect

    C

    Interstitial defect

    D

    Substitutional defect

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    PYQ YEAR: 2022
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Solid State, Point Defects

    9.

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

    A

    6.02x1016  mol−16.02{\rm{x}}{10^{16}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    B

    6.02x1017  mol−16.02{\rm{x}}{10^{17}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    C

    6.02x1014  mol−16.02{\rm{x}}{10^{14}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    D

    6.02x1015  mol−16.02{\rm{x}}{10^{15}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Solid State Chemistry, Doping, Cation Vacancies, Mole Percent, Avogadro's Number

    10.

    Schottky defects occurs mainly in electrovalent compounds where

    A

    Positive ions and negative ions are of different size

    B

    Positive ions and negative ions are of same size

    C

    Positive ions are small and negative ions are big

    D

    Positive ions are big and negative ions are small

    Question Tags
    📚 Subject:Chemistry
    📑 Chapter:The Solid State
    🎯Topic:Stoichiometric Defects, Non-Stoichiometric Defects
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Schottky defect, ionic compounds, crystal structure

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