Test: Solutions Notes | EduRev

Chemistry Class 12

Class 12 : Test: Solutions Notes | EduRev

The document Test: Solutions Notes | EduRev is a part of the Class 12 Course Chemistry Class 12.
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Question 1:Which one of the following aqueous solutions will exhibit highest boiling point? 

Question 2:6.02 x 1020 molecules of urea are present in 100 mL of its solution. The concentration of urea solution is
(Avogadro constant, NA  = 6.02 x 1023 mol–1)

Question 3:Which of the following liquid pairs shows a positive deviation from Raoult’s law? 

Question 4:Which one of the following statements is false? 

Question 5:If α is the degree of dissociation of Na2SO4, the van’t Hoff factor used for the calculation of molecular mass is  

Question 6:Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 Torr and that of toluene is 22 Torr. The partial vapour pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g toluene in Torr is 

Question 7:Equimolar solutions in the same solvent have  

Question 8:Among the following mixtures, dipole-dipole as the major interaction, is present in 

Question 9:18 g of glucose (C6H12O6) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 100°C is 

Question 10:A 5.25% solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol–1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm–3, molar mass of the substance will be 

Question 11:In a saturated solution of the sparingly soluble electrolyte AgIO3 (relative molecular mass = 283) the equilibrium which sets in is
Test: Solutions Notes | EduRev
If the solubility product constant Ksp of AgIO3 at a given temperature is 1.0 x 10–8 M, what is the mass of AgIO3 contained in 100 mL of its saturated solution? 

Question 12:A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mmHg at 300 K. The vapour pressure of propyl alcohol is 200 mmHg. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mmHg) at the same temperature will be  

Question 13:At 80 °C, the vapour pressure of pure liquid A is 520 mmHg and that of pure liquid B is 1000 mmHg. If a solution of A and B boils at 80 °C and 1 atm pressure, the amount per cent of A in the mixture is 

Question 14:The vapour pressure of water at 20°C is 17.5 mmHg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20°C, the vapour of the resulting solution will be  

Question 15:Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1 mol of X and 3 mol of Y is 550 mmHg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mmHg. The vapour pressures (in mmHg) of X and Y in their pure states, respectively, will be  

Question 16:A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution? 

Question 17: If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the decrease in freezing point of water (ΔTf) when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, (Kf = 1.86 K kg mol–1) is 

Question 18:On mixing, heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components (heptane and octane) are 105 kPa and 45 kPa, respectively. Vapour pressure of the solution obtained by mixing 25.0 g of heptane (molar mass = 100 g mol–1) and 35.0 g of octane (molar mass of octane = 114 g mol–1) will be  

Question 19:Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6°C will be (Kf for water = 1.86 K kg mol–1 and molar mass of ethylene glycol = 62 g mol–1)  

Question 20:The degree of dissociation (α) of a weak electrolyte AxBy is related to van’t Hoff factor (i) by the expression

Question 21:A 5.2 molal aqueous solution of methyl alcohol, CH3OH is supplied. What is the mole fraction of methyl alcohol in the solution?  

Question 22:A 5 % solution of cane sugar (molar mass: 342 g mol–1) is isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g/mol is  

Question 23:The molality of a urea solution in which 0.0100 g of urea, [(NH2)2CO], is added to 0.3000 dm3 of water at STP is 

Question 24:Kf for water is 1.86 K kg mol–1. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C2H6O2) must you add to get the freezing point of the solution lowered to – 2.8°C?  

Question 25:Consider separate solutions of 0.500 M C2H5OH(aq), 0.100 M Mg3(PO4)2 (aq), 0.250 M KBr (aq) and 0.125 M Na3PO4(aq) at 50°C. Which statement is true about these solutions, assuming all salts to be strong electrolytes?  

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