Related InterviewSolutions

• Iodine molecules are held in the crystal lattice by:A. London forcesB. dipole -dipole interactionsC. covalent bondsD. coulombic forces
• The edge of unit of `FC C Xe` crystal is 620 pm .The radius of Xe atom isA. 213.25 pmB. 235.16 pmC. 189.37 pmD. 209.87 pm
• Classify the following solids into four categories based on intermolecular forces of interaction. Caesium chloride, Solid carbon disulphide , Bronze ,Neon ,Boron nitride, Washing soda , Carborundum , Corrudum , Solid `NH_3`, Solid camphor , Silver , Silica
• which of the following statemets is not true about the hexagonal close packing ?A. In hcp, atoms occupy 74% the available spaceB. It is AB AB type packing in which third layer is aligned with the first layerC. Be, Mg, Mo etc. are found to have hcp structureD. The coordination number is 6
• Observe the given figure carefully and fill in the blanks by choosing the correct option . A. `{:("(p)","(q)","(r)"),("Perfect crystal","p-type semiconductor","n-type semiconductor") :}`B. `{:("(p)","(q)","(r)"),("Doped crystal","n-type semiconductor","p-type semiconductor") :}`C. `{:("(p)","(q)","(r)"),("Perfect crystal","n-type semiconductor","p-type semiconductor") :}`D. `{:("(p)","(q)","(r)"),("n-type semiconductor","Perfect crystal ","p-type semiconductor") :}`
• Fill in the blanks by choosing the correct option . Metals often occur in ___x___ condition. Individual crystals are randomly oriented so a metallic sample may appear to be __y___ even though a single crystal is __z__A. x-crystalline , y-isotropic , z-anisotropicB. x-polycrystalline , y-isotropic , z-anisotropicC. x-anisotropic, y-isotropic , z-crystallineD. x-crystalline , y-anisotropic , z-isotropic
• Study the figure of a solid given below depicting the arrangement of particles. Which is the most appropriate term used for the figure ? A. IsotropyB. AnisotropyC. Irregular shapeD. Amorphous nature
• A compound having bcc geometry has atomic mass 50. Calculate the density of the unit cell if its edge length is 290 pm.
• An element occurs in BCC with edge length 300 pm. The density of solid is `"7.2 g cm"^(-3)`. Find out (a)Number of atoms in foil of `27 cm^2` area and 1 cm thickness. (b)Number of unit cells in the foil . (c )Number of atoms in a foil of 100 g.
• A metal crystallises in a bcc lattice ,its unit cell edge length in about `300` pm and its molar mass is about `50g mol^(-1)` what would be the density of the metal (in g `cm^(-3))`?A. `"10 g cm"^(-3)`B. `" 14.2 g cm"^(-3)`C. `"6.15 g cm"^(-3)`D. `"9.32 g cm"^(-3)`