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Silicon is found in nature in the form of (a) Body centred cubic structure (b) Hexagonal close – packed structure (c) Network solid (d) Face centred cubic structure Silicon is found in nature in the form of (a) Body centred cubic structure (b) Hexagonal close - packed structure (c) Network solid (d) Face centred cubic [...]

What type of crystal defect is indicated in the diagram below (a) Interstitial defect (b) Schottky defect (c) Frenkel defect (d) Frenkel and Schottky defects What type of crystal defect is indicated in the diagram below (a) Interstitial defect (b) Schottky defect (c) Frenkel defect (d) Frenkel and Schottky defects December 17, 2020 Category: Uncategorised [...]

A match box exhibits (a) Cubic geometry (b) Monoclinic geometry (c) Orthorhombic geometry (d) Tetragonal geometry A match box exhibits (a) Cubic geometry (b) Monoclinic geometry (c) Orthorhombic geometry (d) Tetragonal geometry December 17, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,

Given that the radius of Na^+ ion is 0.95 A and that of Cl^- ion is 1.81 A , hence in the close packed lattice of Cl^- ions Na^+ ions prefer to occupy Given that the radius of Na^+ ion is 0.95 A and that of Cl^- ion is 1.81 A hence in the close [...]

Assertion: Anion vacancies in alkali halides are produced by heating the alkali halide crystals with alkali metal vapour. Reason: Electrons trapped in anion vacancies are referred to as F -centres. Assertion: Anion vacancies in alkali halides are produced by heating the alkali halide crystals with alkali metal vapour. Reason: Electrons trapped in anion vacancies are [...]

Which is the incorrect statement? (a) Density decreases in case of crystals with Schottky defect. (b) NaCls is insulator silicon is semiconductor silver is conductor. quartz is piezoelectric crystal. (c ) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.(d) FeO0.98 has non-stoichiometric metal deficiency defect [...]

If the pressure on a NaCl structure is increased , then its coordintaion number will (a) Increase (b) Decrease (c) Remain the same (d) Either (b) or (c) If the pressure on a NaCl structure is increased then its coordintaion number will (a) Increase (b) Decrease (c) Remain the same (d) Either (b) or (c) [...]

The pyknometric density of sodium chloride crystal is 2.165 x 10^3 kg/m^3 while its X – rays density is 2.178 x 10^3 kg/m^3. The fraction of unoccupied sites in sodium chloride crystal is The pyknometric density of sodium chloride crystal is 2.165 x 10^3 kg/m^3 while its X - rays density is 2.178 x 10^3 [...]

Assertion : No compound has both Schottky and Frenkel defects. Reason : Both defects change the density of the solid. Assertion : No compound has both Schottky and Frenkel defects. Reason : Both defects change the density of the solid. December 17, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) ,

Which one of the following is the most correct statement (a) Brass is an interstitial alloy, while steel is a substitutional alloy (b) Brass is a substitutional alloy , while steel is an interstitial alloy (c) Brass and steel are both substional alloy (d) Brass and steel are both interstitial alloy Which one of the [...]