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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
The vapour pressure of pure benzene is 640mm og Hg. 2.175×10-3kg of non-vloatile solute is added to 39 gram of benzene the vapour pressure of solution is 600mm of HG. Calculate molar mass of solute.
[C = 12, H = 1]
Concept: Colligative Properties and Determination of Molar Mass - Introduction
Why is molality of a solution independent of temperature?
Concept: Expressing Concentration of Solutions
The determination of molar mass from elevation in boiling point is called as
- cryoscopy
- colorimetry
- ebullioscopy
- spectroscopy
Concept: Colligative Properties and Determination of Molar Mass - Introduction
Colligative property depends only on ........................ in a solution.
Concept: Colligative Properties and Determination of Molar Mass - Introduction
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
A solution of glucose in water is labelled as 10% (W/W).
Calculate:
a. Molality
b. Molarity of the solution.
[Given: Density of solution is 1.20 g mL-1 and molar mass of glucose is 180 g mol-1 ]
Concept: Colligative Properties and Determination of Molar Mass - Introduction
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
A solution containing 0.73 g of camphor (molar mass 152 g . mol-1) in 36.8 g of acetone (boiling point 56.3°C) boils at 56.55°C. A solution of 0.564 g of unknown compound in the same weight of acetone boils at 56.46oC. Calculate the molar mass of the unknown compound.
Concept: Colligative Properties and Determination of Molar Mass - Introduction
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
Which of the following solutions shows maximum depression in freezing point?
(A) 0.5 M Li2SQ4
(B) 1 M NaCl
(C) 0.5 M A12(SO4)3
(D) 0.5 MBaC12
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Calculate the mole fraction and molality of HNO3 in solution contaning 12.2%HNO3 (Given atomic mases:H=1, N=13,O=16)
Concept: Colligative Properties and Determination of Molar Mass - Introduction
Calculate the amount of CaCl2 (van't Hoff factor i = 2.47) dissolved in 2.5 L solution so that its osmotic pressure at 300K is 0.75 atmosphere.
Given : Molar mass of CaCl2 is 111g mol-1
R=0.082 L.atm K-1mol-1
Concept: Colligative Properties and Determination of Molar Mass - Introduction
