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Mix Test - 7

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Mix Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which substances show permanent magnetism?
    Solution
    The reason behind such magnetic behaviour is that metal ions in these substances are grouped together into domains. Each domain acts as a tiny magnet having a definite magnetic moment.
  • Question 2
    1 / -0
    Which of these defects is known as Thermodynamic defect?
    Solution
    Vacancy defect is called a thermodynamic defect because this defect arises due to the absorption of heat from the surroundings.
  • Question 3
    1 / -0
    Which of the following solids is called a supercooled liquid?
    Solution
    Quartz glass is said to be amorphous, and hence a supercooled liquid due to its high viscosity.
  • Question 4
    1 / -0
    What is the effect of an increase of temperature on the electrical conductivity of a metal?
    Solution
    Electrical conductivity decreases with an increase of temperature because on heating, the positive ions of the metal atoms start vibrating and produce resistance in the flow of electrons.
  • Question 5
    1 / -0
    Which of the following solids is a good conductor of electricity?
    Solution
    Graphite is a good conductor of electricity because in each layer every carbon atom is linked to three carbon atoms, the fourth electron is free to move about. Presence of these electrons makes it a good conductor.
  • Question 6
    1 / -0
    Which of the following defect does not cause a change in density of the crystal?
    Solution
    Since, no ions are missing from the crystal as a whole, therefore density of the solid remains unchanged.
  • Question 7
    1 / -0
    Which of the following is not a crystalline solid?
    Solution
    Rubber is an amorphous solid as there is no regular arrangement of its constituents particles.
  • Question 8
    1 / -0
    What is the colour of LiCl when excess Li is added?
    Solution
    On heating electrons are trapped at the anionic sites forming F-centres, which absorb energy from light and radiate pink colour.
  • Question 9
    1 / -0
    Which of the following solids conduct electricity in molten state, but not in solid state?
    Solution
    In the molten state, ionic solids dissociate to give free ions, and hence can conduct electricity.
  • Question 10
    1 / -0
    Which of these defects are not found in pure alkali metal halides?
    Solution
    Alkali metals have large size, which cannot fit into the interstitial sites.
  • Question 11
    1 / -0
    Which of the following have maximum packaging efficiency?
    Solution
    FCC has maximum packaging efficiency, as it has a closed packed structure.
  • Question 12
    1 / -0
    What is the effect of pressure on NaCl crystal's coordination number?
    Solution
    Increases from 6:6 to 8:8 as NaCl structure gets converted to CsCl structure.
  • Question 13
    1 / -0
    Which of these defects is called dislocation defect?
    Solution
    As the smaller ions get dislocated from the normal site to an interstitial site.
  • Question 14
    1 / -0
    The total number of tetrahedral voids per unit cell in NaCl is
    Solution
    NaCl has FCC arrangement of Cl ions. Hence, the number of Cl ions in packaging per unit cell= 4
    Tetrahedral is double of octahedral voids. Thus, 2n= 8.
  • Question 15
    1 / -0
    What kind of defects are introduced by doping?
    Solution
    As doping is done with electron rich or electron deficient impurities. Hence, it introduces electronic defects.
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