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Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Concept: Classification of Crystalline Solids
A substance crystallizes in fcc structure. The unit cell edge length is 367.8 pm. Calculate the molar mass of the substance if its density is 21.5 g/cm3.
Concept: Packing Efficiency
Derive the relationship between relative lowering of vapour pressure and molar mass of nonvolatile solute.
Concept: Colligative Properties and Determination of Molar Mass >> Relative Lowering of Vapour Pressure
Calculate the freezing point of solution when 1.9 g of MgCl2 (M = 95 g mol−1) was dissolved in 50 g of water, assuming MgCl2 undergoes complete ionization.
(Kf for water = 1.86 K kg mol−1)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
What happens when the external pressure applied becomes more than the osmotic pressure of solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
What happens when the external pressure applied becomes more than the osmotic pressure of solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
When 2.56 g of sulphur was dissolved in 100 g of CS2, the freezing point lowered by 0.383 K. Calculate the formula of sulphur (Sx).
(Kf for CS2 = 3.83 K kg mol−1, Atomic mass of sulphur = 32 g mol−1]
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
(i) 1.2% sodium chloride solution?
(ii) 0.4% sodium chloride solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
(i) 1.2% sodium chloride solution?
(ii) 0.4% sodium chloride solution?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).
(Given : Molar mass of benzoic acid = 122 g mol−1, Kf for benzene = 4.9 K kg mol−1)
Concept: Abnormal Molar Masses
Define the following terms : Molarity
Concept: Solubility >> Solubility of a Solid in a Liquid
A solution of glucose (molar mass = 180 g mol–1) in water is labelled as 10% (by mass). What would be the molality and molarity of the solution ? (Density of solution = 1.2 g mL–1)
Concept: Colligative Properties and Determination of Molar Mass
Define Molality.
Concept: Expressing Concentration of Solutions
Define isotonic solutions.
Concept: Types of Solutions
Define reverse osmosis.
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
Define reverse osmosis.
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
Define the Enthalpy of atomization.
Concept: Chemical Thermodynamics and Energetic >> Internal Energy and Enthalpy
State Third law of thermodynamics. Give ‘two’ uses.
Concept: Chemical Thermodynamics and Energetic >> Second and Third Law of Thermodynamics
Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.
Concept: Chemical Thermodynamics and Energetic >> First Law of Thermodynamics
