Crystalline solids have from Chemistry The Solid State

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 Multiple Choice QuestionsMultiple Choice Questions

221.

Suppose the mass of a single Ag-atom is m. Ag metal crystallises in fcc lattice with unit cell of length a. The density of Ag metal in terms of a and 'm' is

  • 4ma3

  • 2ma3

  • ma3

  • m4a3


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222.

Crystalline solids have

  • short range order

  • long range order

  • anisotropic distribution

  • All of these.


D.

All of these.

Crystalline solids are anisotropic therefore their physical properties e.g. electrical conductivity, thermal conductivity, refractive index are the different in different directions. But amorphous solids, liquids and gases are isotropic (i.e. same physical properties in all directions).


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223.

The number of carbon atoms per unit cell of diamond unit cell is

  • 4

  • 8

  • 6

  • 1


224.

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm3. The molar mass of the metal is (NA  vogadro's constant = 6.02x 1023 mol-1).

  • 40 g mol-1

  • 30 g mol-1

  • 27g mol-1

  • 20 g mol-1


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225.

What is the co-ordination number of body centred cube ?

  • 8

  • 6

  • 4

  • 12


226.

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :

  • C3A2

  • C3A4

  • C4A3

  • C2A3


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