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question_answer1) For an element of FCC crystal lattice having edge length 400 pm, calculate the maximum diameter of an atom which can be placed in interstitial site so that the structure remain same.
question_answer2) For a cubical system the following information are available. Edge length \[=5\overset{\text{o}}{\mathop{\text{A}}}\,;\,\,density\,\,=2gm/c{{m}^{3}}\] Atomic wt. = 75. Determine the radius of the atom in pm?
question_answer3) A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is\[8\,g\,c{{m}^{-3}}\], then the number of atoms present in 256 g of the crystal is\[N\times {{10}^{24}}\] . The value of N is
question_answer4) If an element (at. wt. = 50) crystallizes in fcc lattice, with a = 0.50 nm. What is the density of unit cell if it contains 0.25% schottky defects (use\[{{N}_{A}}=6\times {{10}^{23}}\]). Give your answer as multiple of\[{{10}^{-24}}\] .
question_answer5) Copper metal has a face-centred cubic structure with the unit cell length equal to 0.361 nm. Picturing copper ions in contact along the face diagonal, The apparent radius of a copper ion is -
question_answer6) \[TlAl{{\left( S{{O}_{4}} \right)}_{2}}.\,x{{H}_{2}}O\] is bcc with 'a' = 1.22 nm. If the density of the solid is 2.32 g/cc, then the value of x is (Given: \[{{N}_{A}}=6\times {{10}^{23}}\]; at. wt.: Tl = 204, Al = 27, S = 32).
question_answer7) The coordination number of a metal crystallizing in a hexagonal close packed structure is x. What is the value of x/2.
question_answer8) Lithium borohydride \[\left( LiB{{H}_{4}} \right)\] , crystallises in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are: a=6.81 A, b=4.43 A, c=717 A. If the molar mass of \[LiB{{H}_{4}}\] is \[21.76g\,mo{{l}^{-1}}\] . The density of the crystal is -
question_answer9) Calculate the density of diamond -
question_answer10) In a plannar tetraatomic molecule, \[A{{B}_{3}}\] , A is at the centroid of the equilateral triangle formed by the atoms, B If the A - B bond distance is\[1\overset{\text{o}}{\mathop{\text{A}}}\,\], what is the distance between the centres of any two B atoms?
question_answer11) A body centered cubic lattice is made up of hollow spheres of B. Spheres of solid A are present in hollow spheres of B. Radius A is half of radius of B. What is the ratio of total volume of sphere of B unoccupied by A in a unit cell and volume of unit cell? (Take \[\pi =3.14\])
question_answer12) In diamond, carbon atom occupy FCC lattice points as well as alternate tetrahedral voids. If edge length of the unit cell is 356 pm, then radius of carbon atom is
question_answer13) The composition of a sample of wustite is\[F{{e}_{0.93}}{{O}_{1.0}}\] . What percentage of iron is present in the form of Fe (III)?
question_answer14) The two ions \[{{A}^{+}}\] and \[B{{\,}^{-}}\] have radii 88 and 200 pm respectively. In the closed packed crystal of compound AB, Predict the co-ordination number of \[{{A}^{+}}\].
question_answer15) If \[NaCl\] is doped with \[{{10}^{-3}}mol\] % of \[SrC{{l}_{2}}\] , what is the concentration of cation vacancy? Give your answer as a multiple of \[{{10}^{-18}}\] .
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