- 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?
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Evaluation Test Class 12 - Chemistry - The Solid State (Unit 1) - CBSE ICSE
Evaluation Test Class 12 - Chemistry - The Solid State (Unit 1) - CBSE ICSE
Posted by EduEvoke on
May 19, 2020