JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank

done Defects in Crystal Total Questions - 23

• question_answer1)
  Certain crystals produce electric signals on application of pressure. This phenomenon is called    [BHU 2005]
  A)
                  Pyroelectricity   done clear
  B)
                  Ferroelectricity done clear
  C)
                  Peizoelectricity done clear
  D)
                  Ferrielectricity done clear
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• question_answer2)
  Which defect causes decrease in the density of crystal [KCET 2000, 05]
  A)
                  Frenkel done clear
  B)
                  Schottky done clear
  C)
                  Interstitial           done clear
  D)
                  \[F-\]centre done clear
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• question_answer3)
  The correct statement regarding \[F-\]centre is
  A)
                  Electron are held in the voids of crystals done clear
  B)
                  \[F-\]centre produces colour to the crystals done clear
  C)
                  Conductivity of the crystal increases due to \[F-\]centre done clear
  D)
                  All done clear
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• question_answer4)
  Doping of silicon (Si) with boron B leads to [UPSEAT  2004]
  A)
                  \[n\]-type semiconductor            done clear
  B)
                  \[p\]-type semiconductor done clear
  C)
                  Metal    done clear
  D)
                  Insulator done clear
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• question_answer5)
  If \[NaCl\] is doped with \[{{10}^{-3}}mol\ %\,\,SrC{{l}_{2}},\] then the concentration of cation vacancies will be
  A)
                  \[1\times {{10}^{-3}}mol%\]       done clear
  B)
                  \[2\times {{10}^{-3}}mol%\] done clear
  C)
                  \[3\times {{10}^{-3}}mol%\]       done clear
  D)
                  \[4\times {{10}^{-3}}mol%\] done clear
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• question_answer6)
  In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is
  A)
                  Presence of \[N{{a}^{+}}\]ions in the crystal lattice done clear
  B)
                  Presence of \[C{{l}^{-}}\]ions in the crystal lattice done clear
  C)
                  Presence of electron in the crystal lattice done clear
  D)
                  Presence of face centered cubic crystal lattice done clear
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• question_answer7)
  Frenkel defect is caused due to                 [MP PET 1994]
  A)
                  An ion missing from the normal lattice site creating a vacancy done clear
  B)
                  An extra positive ion occupying an interstitial position in the lattice done clear
  C)
                  An extra negative ion occupying an interstitial position in the lattice done clear
  D)
                  The shift of a positive ion from its normal lattice site to an interstitial site done clear
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• question_answer8)
  Which one of the following has Frenkel defect [MP PMT 2000]
  A)
                  Sodium chloride               done clear
  B)
                  Graphite done clear
  C)
                  Silver bromide done clear
  D)
                  Diamond done clear
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• question_answer9)
  Schottky defect generally appears in      [DCE 2004]
  A)
                  \[NaCl\]               done clear
  B)
                  \[KCl\] done clear
  C)
                  \[CsCl\]                done clear
  D)
                  All of these done clear
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• question_answer10)
  Schottky defect in crystals is observed when [CBSE PMT 1998; KCET 2002]
  A)
                  Density of crystal is increased done clear
  B)
                  Unequal number of cations and anions are missing from the lattice done clear
  C)
                  An ion leaves its normal site and occupies an interstitial site done clear
  D)
                  Equal number of cations and anions are missing from the lattice done clear
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• question_answer11)
  Ionic solids, with Schottky defects, contain in their structure [CBSE PMT 1994]
  A)
                  Equal number of cation and anion vacancies done clear
  B)
                  Anion vacancies and interstitial anions done clear
  C)
                  Cation vacancies only done clear
  D)
                  Cation vacancies and interstitial cations done clear
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• question_answer12)
  The following is not a function of an impurity present in a crystal               [MP PET 1995]
  A)
                  Establishing thermal equilibrium done clear
  B)
                  Having tendency to diffuse done clear
  C)
                  Contributing to scattering done clear
  D)
                  Introducing new electronic energy levels done clear
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• question_answer13)
  Due to Frenkel defect, the density of ionic solids [MP PET 1996; MP PMT 2002]
  A)
                  Increases             done clear
  B)
                  Decreases done clear
  C)
                  Does not change              done clear
  D)
                  Changes done clear
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• question_answer14)
  Point defects are present in        [MP PMT 1997]
  A)
                  Ionic solids          done clear
  B)
                  Molecular solids done clear
  C)
                  Amorphous solids            done clear
  D)
                  Liquids done clear
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• question_answer15)
  If a non-metal is added to the interstitial sites of a metal then the metal becomes            [DCE 2001]
  A)
                  Softer   done clear
  B)
                  Less tensile done clear
  C)
                  Less malleable   done clear
  D)
                  More ductile done clear
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• question_answer16)
  In \[AgBr\] crystal, the ion size lies in the order \[A{{g}^{+}}<<B{{r}^{-}}.\] The \[AgBr\] crystal should have the following characteristics
  A)
                  Defectless (perfect) crystal done clear
  B)
                  Schottky defect only done clear
  C)
                  Frenkel defect only done clear
  D)
                  Both Schottky and Frenkel defects done clear
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• question_answer17)
  Frenkel and Schottky defects are             [BHU 2003]
  A)
                  Nucleus defects               done clear
  B)
                  Non-crystal defects done clear
  C)
                  Crystal defects  done clear
  D)
                  None of these done clear
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• question_answer18)
  Which one of the following is the most correct statement
  A)
                  Brass is an interstitial alloy, while steel is a substitutional alloy done clear
  B)
                  Brass is a substitutional alloy, while steel is an interstitial alloy done clear
  C)
                  Brass and steel are both substitutional alloys done clear
  D)
                  Brass and steel are both interstitial alloys done clear
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• question_answer19)
  The flame colours of metal ions are due to           [KCET 2003]
  A)
                  Frenkel defect  done clear
  B)
                  Schottky defect done clear
  C)
                  Metal deficiency defect                done clear
  D)
                  Metal excess defect done clear
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• question_answer20)
  Which one of the following crystals does not exhibit Frenkel defect         [MP PET 2002]
  A)
                  AgBr      done clear
  B)
                  AgCl done clear
  C)
                  KBr         done clear
  D)
                  ZnS done clear
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• question_answer21)
  In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is [AIIMS 1982, 1991; DCE 2002; J & K 2005]
  A)
                  Interstitial defect             done clear
  B)
                  Valency defect done clear
  C)
                  Frenkel defect  done clear
  D)
                  Schottky defect done clear
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• question_answer22)
  When electrons are trapped into the crystal in anion vacancy, the defect is known as      [BHU 2005]
  A)
                  Schotky defect  done clear
  B)
                  Frenkel defect done clear
  C)
                  Stoichiometric defect     done clear
  D)
                  F-centres done clear
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• question_answer23)
  Schottky defect defines imperfection in the lattice structure of a              [AIIMS 2002]
  A)
                  Solid      done clear
  B)
                  Liquid done clear
  C)
                  Gas        done clear
  D)
                  Plasma done clear
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