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question_answer1) Which of the following solids have highest melting point?
question_answer2) What is the number of atoms per unit cell present in simple cubic, face-centered cubic and body centered cubic respectively?
question_answer3) A compound is formed by two elements A and B. The atoms A are at the corners of the cube and atoms B are at the centre of the body. The simplest formula of the compound is
question_answer4) What will be the interionic distance for CsCI?
question_answer5) Some of the physical properties of crystalline solids like refractive index show different values on measuring along different directions in the same crystals. This property is called
question_answer6) In a compound, atoms of element B form ccp lattice and those of element A occupy 2/3rd of tetrahedral voids. The formula of the compound will be
question_answer7) Which of the following statements is true?
question_answer8) Complete the following analogy : Coordination number in a square close packed structure : A:: Coordination number in hexagonal close packed structure : B
question_answer9) Identify the crystal from the following, whose alternate tetrahedral voids are occupied?
question_answer10) How many unit cells are present in a cube shaped ideal crystal of NaCI of mass 2.00 g?
question_answer11) The coordination number of cations and anions in calcium fluoride structure are respectively
question_answer12) Identify the coordination number if the radius ratio is in the range of 0.414 - 0.732.
question_answer13) Identify the non-stoichiometric compound.
question_answer14) The correct statement(s) regarding defects in solids is/are : I. Frenkel defect is caused due to shift of positive ion from its normal lattice site to interstitial site. II. Frenkel defect is not a dislocation defect. III. Schottky defects have no effect on the physical properties of solid. IV. Trapping of \[{{e}^{-}}\] in lattice leads to the formation of F-centre.
question_answer15) What type of crystal defect is indicated in the diagram below? \[{{A}^{+}}\] \[{{B}^{-}}\] \[{{A}^{+}}\] \[\square \] \[{{A}^{+}}\] \[{{B}^{-}}\] \[{{B}^{-}}\] \[\square \] \[{{B}^{-}}\] \[{{A}^{+}}\] \[\square \] \[{{A}^{+}}\] \[{{A}^{+}}\] \[{{B}^{-}}\] \[\square \] \[{{B}^{-}}\] \[{{A}^{+}}\] \[{{B}^{-}}\]
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