Evaluation Test Class 12 - Chemistry - The Solid State (Unit 1) - CBSE ICSE
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What is the number of atoms in a metallic crystal having (a) bcc structure (b) fcc
structure
What is the percentage of tetrahedral holes occupied by \(Zn^+\) ions in a ZnS lattice?
In which type of packing the efficiency of packing is (a) 74% (b) 68%
Mention one property which is caused due to the pressure of
f-center in a solid.
Which type of crystals exhibit piezoelectricity?
Predict the structure of MgO crystal and coordination number
of its cation in which the cation and anion radii are 65 pm and 140 pm
respectively.
Why is coordination number of 12 not found in ionic crystals?
Give reasons: (a) ZnO
becomes yellow on heating. (b) Pure
silicon is an insulator but becomes a semiconductor on heating.
How can we convert CsCl structure to NaCl structure and
vice-versa?
An element crystallises in a structure of edge length of
unit cell 200 pm. Calculate its density if 200 g of this element contains \(24\times{10}^{23}\) atoms.
Calculate the distance between \(Na^+\) in NaCl crystal, if its
density is 2.165 g\(cm^{-3}\). Assume that NaCl has
fcc lattice.
Silicon doped with phosphorus forms n-type of semiconductor
while p-type semiconductor is formed when dopind is done with gallium. Give
proper explanation.
How will you distinguish between the following pair:
Hexagonal close packing and Cubic close packing?
Calculate the efficiency of packing in case of metal crystal
for body cubic structure.
If the radius of an octahedral void is ‘r’ and the radius of
atoms in close packing is ‘R’, drive the relationship between ‘r’ and ‘R’.
On the basis of band theory, what is the difference between
a conductor and an insulator?
