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The coordination number of atoms in body-centred cubic structure (bcc) is ______.
Concept: Cubic System
Write the consequences of Schottky defect with reasons.
Concept: Crystal Defects or Imperfections
Explain metal deficiency defect with examples.
Concept: Crystal Defects or Imperfections
Aluminium crystallises in a cubic close-packed structure with a unit cell edge length of 353.6 pm. What is the radius of Al atom? How many unit cells are there in 1.00 cm3 of Al?
Concept: Packing of Particles in Crystal Lattice
An element has a bee structure with unit cell edge length of 288 pm. How many unit cells and number of atoms are present in 200 g of the element?
Concept: Cubic System
Name a compound where Frenkel defect is found.
Concept: Crystal Defects or Imperfections
The relation between the radius of the sphere and the edge length in the body-centred cubic lattice is given by the formula ______.
Concept: Packing Efficiency
Explain the following term:
Substitutional impurity defect
Concept: Crystal Defects or Imperfections
Explain the following term:
Interstitial impurity defect
Concept: Crystal Defects or Imperfections
Silver crystallizes in the fcc structure. If the edge length of the unit cell is 400 pm, calculate the density of silver (Atomic mass of Ag = 108).
Concept: Cubic System
The number of particles present in Face Centred Cubic Unit cell is/are ______.
Concept: Cubic System
Predict the type of cubic lattice of a solid element having edge length of 400 pm and density is 6.25 g/ml.
(Atomic mass of element = 60)
Concept: Packing of Particles in Crystal Lattice
Write the formula to determine the molar mass of a solute using freezing point depresssion method.
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Why is molality of a solution independent of temperature?
Concept: Expressing Concentration of Solutions
1.0 x10-3Kg of urea when dissolved in 0.0985 Kg of a solvent, decreases freezing point of the solvent by 0.211 k. 1.6x10 Kg of another non-electrolyte solute when dissolved in 0.086 Kg of the same solvent depresses the freezing point by 0.34 K. Calculate the molar mass of the another solute. (Given molar mass of urea = 60)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
The substance ‘X’, when dissolved in solvent water gave molar mass corresponding to the molecular formula ‘X3’. The van’t Hoff factor (i) is _______.
(A) 3
(B) 0.33
(C) 1.3
(D) 1
Concept: Abnormal Molar Masses
The boiling point of water at high altitude is low. because________________ .
(a) the temperature is low.
(b) the atmospheric pressure is low.
(c) the temperature is high.
(d) the atmospheric pressure is high
Concept: Solubility >> Solubility of a Solid in a Liquid
Define Cryoscopic constant.
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10−2 g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.
(R = 0.0821 L atm K−1 mol−1, Molar mass of K2SO4 = 174 g mol−1)
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10−2 g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.
(R = 0.0821 L atm K−1 mol−1, Molar mass of K2SO4 = 174 g mol−1)
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
