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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
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
Explain the amphoteric nature of water.
Concept: Acids and Bases in Daily Life
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
From the given cells:
Lead storage cell, Mercury cell, Fuel cell and Dry cell
Answer the following:
(i) Which cell is used in hearing aids?
(ii) Which cell was used in Apollo Space Programme?
(iii) Which cell is used in automobiles and inverters?
(iv) Which cell does not have long life?
Concept: Batteries >> Primary Batteries
