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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
Give an example each of a molecular solid and an ionic solid.
Concept: Classification of Crystalline Solids
Gas (A) is more soluble in water than Gas (B) at the same temperature. Which one of the two gases will have the higher value of KH (Henry’s constant) and why
Concept: Solubility >> Solubility of a Gas in a Liquid
In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?
Concept: Vapour Pressure of Liquid >> Vapour Pressure of Liquid- Liquid Solutions
An element crystallises in a b.c.c lattice with cell edge of 500 pm. The density of the element is 7.5g cm-3. How many atoms are present in 300 g of the element?
Concept: Number of Atoms in a Unit Cell
Calculate the boiling point of solution when 4g of MgSO4 (M= 120 g mol-1) was dissolved in 100g of water, assuming MgSO4 undergoes complete ionization. (Kb for water = 0.52 K kgmol-1)
Concept: Colligative Properties and Determination of Molar Mass >> Elevation of Boiling Point
Why do gases always tend to be less soluble in liquids as the temperature is raised?
Concept: Solubility >> Solubility of a Gas in a Liquid
State Raoult’s law for the solution containing volatile components
Concept: Vapour Pressure of Liquid >> Vapour Pressure of Liquid- Liquid Solutions
Calculate the amount of CaCl2 (molar mass = 111 g mol−1) which must be added to 500 g of water to lower its freezing point by 2 K, assuming CaCl2 is completely dissociated. (Kf for water = 1.86 K kg mol−1)
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
An element with density 10 g cm−3 forms a cubic unit cell with edge length of 3 × 10−8 cm. What is the nature of the cubic unit cell if the atomic mass of the element is 81 g mol−1?
Concept: Calculations Involving Unit Cell Dimensions
What type of non-stoichiometric point defect is responsible for the pink colour of LiCl ?
Concept: Imperfections in Solids - Introduction
What type of stoichiometric defect is shown by NaCl ?
Concept: Imperfections in Solids - Introduction
How will you distinguish between the following pair of terms?
Tetrahedral and octahedral voids
Concept: Close Packed Structures - Formula of a Compound and Number of Voids Filled
How will you distinguish between the following pair of terms?
Crystal lattice and unit cell
Concept: Crystal Lattices and Unit Cells
Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other.
Concept: Properties of Solids: Magnetic Properties
Which stoichiometric defect does not change the density of the crystal?
Concept: Imperfections in Solids - Introduction
Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.
Concept: Properties of Solids: Magnetic Properties
Which stoichiometric defect decreases the density of the crystal?
Concept: Imperfections in Solids - Introduction
Explain ionic solids are hard and brittle.
Concept: Classification of Crystalline Solids
Define Molarity (M).
Concept: Expressing Concentration of Solutions
