के य व य ा ल य स ंग ठ न KENDRIYA VIDYALAYA SANGATHAN

1 / KENDRIYA VIDYALAYA SANGATHAN / hyderabad REGIONQUESTION BANK OF MULTIPLE-CHOICE QUESTIONS 2021-22 CLASS -XIISUBJECT -CHEMISTRYCHIEF PATRONSRI K. SASEENDRAN, DEPUTY COMMISSIONERPATRONDR (SMT) V. GOWRI, ASSISTANT KRISHNA KARMAKAR-KV VICE PRINCIPAL-KV PICKETPREPARED & VETTED BY SUBJECT P HEMACHANDER,PICKET- ALCOHOLS PHENOLS AND ETHERS HALOALKANES P BLOCK, ,HAKIMPET -SOLID SREEDHAR- PGT CHEMISTRY-N0-2 NAUSENABAGH (SOLUTIONS) MADHUSUDHAN RAO -PGT CHEMISTRY, KV GOLCONDA -2(SOLUTIONS) -PGT CHEMISTRY- KV BOLARAM (SOLIDSTATE) SHOBHAN BABU- PGT CHEMISTRY-(SOLID STATE) ANJANEYULU- PGT CHEMISTRY-(HALOALKANES AND HALOARENES) DLN MURTHY -PGT CHEMISTRY-(P-BLOCK ELEMENTS) VICTOR EMMANEUL- PGT CHEMISTRY-(BIOMOLECULES) LAXMI PAPPAI -PGT CHEMISTRY, KV NSB-1(P- BLOCKELEMENTS)

2 NAVEEN-PGT CHEMISTRY-(HALOALKANES AND HALOARENES) VENKATESH PGT-CHEMISTRY, KV STEEL PLANT (ALCOHOLS, PHENOLS,AND ETHERS) KENDRIYA VIDYALAYA SANGATHAN hyderabad REGIONQ uestions based on assessment introduced by the : XII SUBJECT: CHEMISTRYLESSON:1. SOLID STATE(1) based Questions:Passage IRead the passage given below and answer the questions that follow:At absolute zero crystals tend to have perfectly ordered arrangement. As thetemperature increases crystals start to deviating perfectly orderedarrangement. Point defects are the deviations from the ideal defects may be classified into three ) stoichiometric defectsii) impurity defects andiii) non stoichiometric ) Cations are present in the interstitial sites ini) schottky defectii) Frenkel defectiii) Metal deficiency defectiv) Vacancy defectAnswersii) ) schottky defect is observed in crystals wheni) some cations move from their lattice site to interstitial sitesii) equal number of cations and anions are missing from the latticeiii) some lattice sites are occupied by electronsiv) some impurity is present in the latticeii) )

3 Which of the point defects are shown by AgBr crystals?a) schottky defectb) Frenkel defectc) Metal deficiency defectd) Metal excess defecti) a) and b)ii) c) and d)iii) a) and c)iv) b) and d)i) ) Alkali metal halide on heating with same alkali metal vapors impartsparticular color to the crystal. What kind of defect is it?i) Due to impurity defectii) Metal excess defect due to interstitial cationiii) Metal deficiency defectiv) Metal excess defect due to anionic vacanciesiv) IIRead the passage given below and answer the questions that follow:In solids, the constituent particles are close packed, leaving the minimumvacant space, considering the constituent particles as identical hard spheresand build up the three dimensional structure in three ) close packing one-dimensionb) close packing in two-dimensionc) close packing in three types of voids namely tetrahedral voids and octahedral voids involved inclose packed ) What is the coordination number in a square close packed structure in twodimensions?

4 I) 3ii) 4iii) 6iv) 2ii) ) The correct order of packing efficiency in different types of unit cells isi) bcc < fcc > simple cubicii) fcc < bcc <simple cubiciii) fcc > bcc > simple cubiciv) fcc < bcc > simple cubiciii) ) The total number of tetrahedral voids in the face centered unit cell isi) 12ii) 6iii) 8iv) 10iii) ) The percentage of empty space in a face centered cubic arrangement isi) 74ii) 68iii) 32iv) 26iv) IIIRead the passage given below and answer the questions that follow:Crystalline solids can be classified in different types on the basis of nature ofintermolecular forces or bonds that hold the constituent particles are Vander Waals forces, ionic bonds, covalent bonds and metallicbonds.

5 On this basis Crystalline solids further classified in to molecular, ionic,metallic and covalent solids. Crystalline solids are anisotropic in naturewhereas amorphous solids are isotropic in ) Which of the following is not a characteristic of a Crystalline solids?i) A regular periodically repeated pattern of arrangement of constituent in thecrystal latticeii) Definite and characteristic heat of fusioniii) properties of crystalline solids like electrical resistance or refractive indexshow different values when measured along different directionsiv) properties of crystalline solids like electrical conductivity or refractive indexshow same values when measured in all directionsiv) ) CCl4 molecules are held in the crystal lattice byi) dipole- dipole interactionsii) dispersion forcesiii) columbic forcesiv) dipole induced dipole interactionsii) )

6 Which of the following is a network solid?i) H2 O (ice)ii) SO2 (solid)iii) diamondiv) I2iii) ) The lattice site in a pure crystal cannot be occupied byi) ionii) electroniii) moleculeiv) atomiv) and Reason Questions:In the following questions a statement of Assertion (A) followed by astatement of Reason (R) is given. Choose the correct answer out of thefollowing and Reason both are correct statements and Reason is correctexplanation for and Reason both are correct statements but Reason is not correctexplanation for is correct statement but Reason is wrong is wrong statement but Reason is correct ) Assertion (A): Tetrahedral void is bigger than octahedral (R): Octahedral void refers to six touching spheres, whereastetrahedral void refers to four touching ) ) Assertion (A): Packing efficiency is maximum in face centered (R): In fcc structure, each sphere is in contact with twelve ) ) Assertion (A).

7 The total number of atoms present in a simple cubic unit cellis (R): Simple cubic unit cell has atoms at its corners, each of whichis shared between eight adjacent unit ) ) Assertion (A): Graphite is a good conductor of electricity, however diamondbelongs to the category of insulatorsReason (R): Graphite is soft nature on the other hand diamond is very ) ) Assertion (A): Crystalline solids exhibit (R): The constituent particles in a crystalline solid are arranged inan orderly arrangementd) ) Assertion (A:) The density of a crystalline substance remains the (R): Due to schottky ) ) Assertion (A): AgCl shows Frenkel (R): The substance in which there is a large difference in the sizeof ) ) Assertion (A): Due to frenkel defect there is no effect on the density of thecrystalline solidReason (R:) In frenkel defect no cation and anion leaves the crystal latticea) Assertion:Metal deficiency defect can be seenin )Reason:Li compound (LiCl) has pink colour dueto F- : (b) Assertion: The number of tetrahedral voids is double the numberof octahedral : The size of tetrahedral voids is half that of theoctahedral : (c)c) :1.

8 SOLID STATE(2)SAMPLE QUESTIONS ON ASSERTION AND REASONTYPE:Note: In the following questions of Solid State astatement of assertion followed by a statement ofreason is given. Choose the correct answer out of thefollowing choices.(a) Both assertion and reason are true and the reason is thecorrect explanation of assertion.(b) Both assertion and reason are true but the reason is notthe correct explanation of assertion.(c) Assertion is true but reason is false.(d) Assertion is false but reason is : The total number of atoms present in a facecentered cubic unit cell is : Face centered cubic unit cell has atoms at itscorners, each of which is shared between eight adjacent unitcells and atom at the center of the six : (a)a) : Total number of octahedral voids present in unitcell of cubicclose packing including the one that is present at the bodycenter is : Besides the body center there is one octahedralvoid present at the center of each of the six faces of the unitcell and each of which is shared between two adjacent : (c)c) Assertion.

9 Group-13 doped crystals of silicon areresponsible for the semi-conducting : Holes (positive in charge) are responsible forthe semi-conducting : (a)a) Assertion : Due to the Frenkel defect the density of thecrystalline solid remains : In Frenkel defect, no cations or anions leavethe latticeAns: (a)a) Assertion: In an ionic solid [MX] with Schottky defects, thenumber of missing positive and negative ions is the : Equal number of cation and anion vacancies : (a)a) Assertion: The Frenkel defect is not shown by alkali : The size of the cation is too big to beaccommodated in the interstitial : (a)a) Assertion: The radius of copper atom is 128pm.

10 Itcrystallizes in a face centered cubic : The length of the edge of the unit cell : (c)c) Assertion: CaCO3 shows : CaCO3 exists in two forms called aragonite : (a)a) Assertion: Metal deficiency defect can be seen in : Li compound (LiCl) has pink colour due to : (b)b) Assertion: The number of tetrahedral voids is double thenumber of octahedral : The size of tetrahedral voids is half that of theoctahedral : (c)c) Based Questions:Packing refers to the arrangement of constituent units insuch a way that the force of attraction among the constituentparticles is maximum and the constituents occupy themaximum available space.