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Solid State Test - 15

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Solid State Test - 15
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Substances that are strongly attracted by applied magnetic field and can be permanently magnetized are

    Solution

    Ferromagnetic substance get permanently magnetised in applied Magnetic Field.

  • Question 2
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    Which type of solid conduct electricity in molten state but not in solid state?

    Solution

    In molten state ions can exist so they can conduct electricity

  • Question 3
    1 / -0

    Yellow colour of NaCl crystals in sodium vapour is due to

    Solution

    • This yellow colour is due to metal excess defect of anionic valency.
    • Na+ion deposited on the surface of crystal of NaCl . The Cl-ion diffused to form NaCl. This happens by loss of electron from Na to Na+.
    • The released electro diffused into the crystal and occupy anionic site called F center which imparts yellow colour to NaCl.

  • Question 4
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    Dislocation defect is also known as

    Solution

    In frenkel defect cation gets dislocated from its position.

  • Question 5
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    Defects in solids can be studied using

    Solution

    All of the above mentioned methods are used to detect the basic structure of the sample, hence can easily detect the defects present in a sample.

  • Question 6
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    Point defect is also known as

    Solution

    Point defects are zero dimensional defects as they cannot extend in any direction in space. Point defects occur where an atom is missing or misplaced in a crystal lattice. The limit of the size of point defect is not defined.

  • Question 7
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    Solid X is a very hard electrical insulator in solid as well as in molten state. It melts at extremely high temperature. Solid X is a

    Solution

    Covalent solid doesnot conduct electricity in molten and solid state.

  • Question 8
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    Nature of binding forces present in carbondioxide molecules in solid state are?

    Solution

    O=C=O<−>−O−C+=O

  • Question 9
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    What type of interaction hold the molecules together in a polar molecular solid?

    Solution

    Polar molecule will act as a dipole.

  • Question 10
    1 / -0

    An atom located at the body center of a cubic unit cell is shared by

    Solution

    In body centred cubic cell, an atom at the body-centre is shared by 1 unit cell. Thus, this atom contributes one atom to the unit cell.

  • Question 11
    1 / -0

    Ionization enthalpy is lowest in

    Solution

    Metals have low ionization energy because of there tendency to lose electrons.

  • Question 12
    1 / -0

    The coordination number of AB having rock salt geometry is

    Solution

    NaCl has rock salt structure. Coordination No. is 6.

  • Question 13
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    MgO has the structure of NaCl. The coordination number of the ions in MgO is

    Solution

    Coordination No. in NaCl is 6.

  • Question 14
    1 / -0

    Type of stoichiometric defect shown by ZnS is

    Solution

    ZnS shows Frenkel defect.

  • Question 15
    1 / -0

    A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is

    Solution

  • Question 16
    1 / -0

    An element forms a cubic unit cell with edge length 405 pm. Molar mass of this element is 2.7 X 10-2 Kg/mol and its density is given as 2.7 X 103 Kg/m3. How many atoms of this elements are present per unit cell.

    Solution

  • Question 17
    1 / -0

    A group of 14 element is converted into n – type semiconductor by dopping it with

    Solution

    Group 15 doping on group 14 element forms n type semiconductor due to excess electrons.

  • Question 18
    1 / -0

    Group 14 element is converted to p – type semiconductor by dopping it with

    Solution

    Doping of group 14 elements with group 13 forms p type semiconductor.

  • Question 19
    1 / -0

    Giant ionic structures is also name given to

    Solution

    • An ionic compound is a giant structure of ions.
    • The ions have a regular, repeating arrangement called an ionic lattice .
    • The lattice is formed because the ions attract each other and form a regular pattern with oppositely charged ions next to each other.

  • Question 20
    1 / -0

    A substance forms face centered cubic crystals. Its density is 1.984 g/cm3 and the length of the edge of the unit cell is 630 pm. Calculate the molar mass in g/mol?

    Solution

  • Question 21
    1 / -0

    The hardest substance among the following is

    Solution

    It has network Structure.

  • Question 22
    1 / -0

    The following diagram shows :

    Solution

    Extra electron is present at anionic site.

  • Question 23
    1 / -0

    In n – type semiconductor current is carried by

    Solution

    N type semiconductors have excess electrons.

  • Question 24
    1 / -0

    The following diagram shows

    Solution

    A Frenkel defect or dislocation defect is a type of point defect in crystalline solids named after its discoverer Yakov Frenkel. The defect forms when an atom or smaller ion (usually cation) leaves its place in the lattice, creating a vacancy, and becomes an interstitial by lodging in a nearby location.

  • Question 25
    1 / -0

    Which transition metal oxide has appearance and conductivity like that of copper?

    Solution

    Rhenium oxide and cooper oxide have same appearance and conductivity.

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