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Solid State Test - 9

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Solid State Test - 9
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The structure of MgO is similar to NaCl. What would be the coordination number of magnesium?

    Solution

    Mg has 6 co-ordination numbers (FCC structure).

     

  • Question 2
    1 / -0

    In the calcium fluoride structure the co-ordination number of the cation and anions are respectively.

    Solution

    The Ca2+ ions are arranged in (CCP) arrangement, i.e. Ca2+ ions is present at all corners and that the center of each face of the cube. The fluoride ions occupy all the tetrahedral sites. This is 8: 4 arrangements i.e., each Ca2+ ion is surrounded by 8F− ions and each F− ion by four Ca2+ ions.

     

  • Question 3
    1 / -0

    Which one possess a antifluorite structure

    Solution

    Na2O has antifluorite (A2B) type structure.

     

  • Question 4
    1 / -0

    Which of the following is a three dimensional silicate

    Solution

    Zeolite is a three dimensional silicate because of in the silicates all the four oxygen atoms at (SiO4)−4 tetrahedral are shared with other tetrahedral, resulting in a three dimensional network.

     

  • Question 5
    1 / -0

    The following is not a function of an impurity present in a crystal.

    Solution

    Impurity present in a crystal does not establish thermal equilibrium.

     

  • Question 6
    1 / -0

    When electrons are trapped into the crystal in anion vacancy, the defect is known

    Solution

    F-centers are the sites where anions are missing and instead electrons are present. They are responsible for colour.

     

  • Question 7
    1 / -0

    Due to Frenkel defect, the density of ionic solids

    Solution

    Since no ions are missing from the crystal as a whole, there is no effect on density.

    Here is only the dislocation of ions so no net change in density.

     

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