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Solid State Tes...

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  • Question 1
    1 / -0

    If $${ Al }^{ 3+ }$$ ions replace $${ Na }^{ + }$$ ions at the edge centres of $$NaCl$$ lattice, then the number of vacancies in 1 mole of $$NaCl$$ will be:

  • Question 2
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    Given an alloy of Cu, Ag, and Au in which Cu atoms constitute the CCP arrangement. If the hypothetical formula of the alloy is $$Cu_{4}Ag_{3}Au$$. What are the probable locations of Ag and Au atoms?

  • Question 3
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    There are three ionic compounds, first compound has fcc lattice of anions and cations are present in all tetrahedral voids, second compound has fcc lattice of anions and cations are present in all octahedral voids and the third compound has simple cubical lattice in which cubical void is occupied by cation, then the order of packing efficiency of these will be :

  • Question 4
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    If x is the length of body diagonal, then the distance between two nearest cations in rock salt structure is:

  • Question 5
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    The packing efficiency of the two- dimensional square unit cell shown below is :

  • Question 6
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    An element crystallizes in a structure having a $$fcc$$ unit cell of an edge length $$200\ pm$$. If $$200\ g$$ of this element contains $$24\times10^{23}$$ atoms then its density is:

  • Question 7
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    Beautiful crystals arise from various chemical substances. A single chemical can, sometimes, give rise to different crystals because of different:

  • Question 8
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    In the table given below, dimensions and angles of various crystals are given. Complete the table by filling the blanks.


    		Types of crystalDimensionsAngles
    1Cubic $$a = b = c$$
    		$$\alpha =\beta = \gamma =$$____(P)
    2Tetragonal______(q)
    		$$\alpha =\beta = \gamma=90^o$$
    3Orthorhombic$$a \neq b \neq c______(r)
    4Hexagonal______(s)$$\alpha = \beta = 90^o,\gamma = $$______(t)

  • Question 9
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    Crystals have 'vacant sites' or 'defects' in them. When light strikes a photographic silver bromide paper, silver atoms move in through these defects to:

  • Question 10
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    A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. What is the density of sodium chloride?

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