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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
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
Explain, why do aquatic animals prefer to stay at lower level of water during summer?
Concept: Solubility >> Solubility of a Gas in a Liquid
Which of the following is not a colligative property?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
Which of the following is not a colligative property?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
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
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
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
Define Freezing point.
Concept: Colligative Properties and Determination of Molar Mass >> Depression of Freezing Point
The temperature at which vapour pressure of a liquid becomes equal to the atmospheric
pressure is _______.
(A) melting point
(B) boiling point
(C) 273 K
(D) 373 K
Concept: Colligative Properties and Determination of Molar Mass >> Relative Lowering of Vapour Pressure
Which mixture is used for respiration by deep sea divers?
(A) He + O2
(B) Ne + O2
(C) Ar + O2
(D) Kr + O2
Concept: Solubility >> Solubility of a Gas in a Liquid
How does solubility of a gas in water varies with the temperature?
Concept: Solubility >> Solubility of a Gas in a Liquid
Derive the relation ∆H − ∆U = ∆nRT.
Concept: Solubility >> Solubility of a Solid in a Liquid
When KOH solution is added to potassium dichromate solution the colour of solution
changes to yellow, because _______
(A) chromate ion changes to dichromate ion
(B) dichromate ion changes to chromate ion
(C) oxidation number of chromium changes from + 6 to + 4
(D) oxidation number of chromium changes from + 4 to +6
Concept: Expressing Concentration of Solutions
How van’t Hoff factor is related to the degree of dissociation?
Concept: Abnormal Molar Masses
Which of the following 0.1 M aqueous solutions will exert the highest osmotic pressure?
Concept: Colligative Properties and Determination of Molar Mass >> Osmosis and Osmotic Pressure
