A solution is a homogeneous mixture of two or more components. The solvent is the component that is present in the greatest quantity. Solutes is the component of a solution that is present in a lower concentration. We will look at binary solutions with two components. Each component in this case can be solid, liquid, or gaseous.
Download Class 12 Chemistry Worksheet on Chapter 2 Solutions Set 5 PDF.
CBSE Class 12 Chemistry Chapter 2 Solutions Worksheet – Set 5
Q-1: Which of the following is/are correct for an ideal binary solution of two volatile liquids(e.g. benzene and toluene)?
- Its vapour is always richer in the more volatile component (compared to the liquid).
- The liquid will gradually become richer in the less volatile component if such a mixture is boiled(distilled).
- The PT (i.e, the total pressure) above the solution will be the sum of the vapour pressures of the two pure components.
- The boiling point of the solution will be less than the boiling points of the two components.
Q-2: 0.7g of solute (molar mass=96 g/mol) is dissolved in 42 g of water.The percentage association of solute in water assuming dimerization is (ΔTf=0.2K and Kf= 1.86 KKg/mol)
Q-3: The graph below depicts the vapour pressure-temperature curves for several liquids-diethyl ether, acetone, water and ethyl alcohol. P,Q,R, and S are liquids, respectively
Q-4: Two liquids A and B follow Raoult’s law over the entire range of concentration. If a solution of A and B has a mole fraction of A as 0.3. Then yA=x/17. The value of x is:
(PoA= 50 Torr, PoB= 100 Torr)
Q-5: A 0.5g organic sample containing Br yields 0.4g of AgBr in a specific reaction. What is the approximate percentage weight of Br in the sample? (Atomic weight of Ag= 108 g/mol; Br= 80g/mol)
Q-6: When 20 g of naphthoic acid (C11H8O2) is dissolved in 50 g benzene(Kf=1.72 K Kg/mol), a freezing point depression of 2K is observed. The van’t Hoff factor(i) is
a) 0.5
b) 1
c) 2
d) 3
Q-7: Toluene and benzene form an ideal solution at room temperature. The true statement(s) for this process is (are)
a) ΔG is positive
b) ΔSsystem is positive
c) ΔSsurrounding = 0
d) ΔH = 0
Q-8: Which of the following curves best represents Henry’s law?
Q-9: Which of the following solutions will have the maximum lowering of vapour pressure?
a) 0.1 M fructose
b) 0.1 M toluene
c) 0.1 M MgCl2
d) 0.1 M KCl
Q-10: When liquids A and B are mixed, they form a warm solution. What kind of deviation does this solution exhibit?
Q-11: Why can’t water be completely separated from an ethyl alcohol aqueous solution?
Q-12: What happens when the applied external pressure exceeds the osmotic pressure of the solution?
Q-13: 2.5 g of protein taken and made 500 mL of solution. The osmotic pressure of the solution is 0.410 atm at 300 K. Find the number of glycine units.
Q-14: Which of the following statement(s) is true?
a) Mass percentage(W/W) is a unit commonly used in industrial chemical applications.
b) Mass of the solute dissolved in 100 g of the solution gives mass by mass percentage.
c) Mass of solute dissolved give mass by volume percentage
d) Both (a) and (b)
Q-15: When a solid solute is added to a solvent, some of it dissolves and its concentration in solution increases. This is referred to as
- Unsaturation
- Saturation
- Crystallisation
- Dissolution
Q-16: The osmotic pressure of blood is 7.47 bar at 300 K. To inject glucose to a patient intravenously, it has to be isotonic with blood. The concentration of glucose in g/L is ______.(Molar mass of glucose = 180g/mol, R=0.083Lbar/K mol) (Nearest integer)
Q-17: Which of the following has a higher boiling point: 1 M glucose or 2 M glucose, and why?
Q-18: Which of the following statements is false?
a) Units of osmotic pressure and atmospheric pressure are the same.
b) Solvent molecules move through a semipermeable membrane from a region of lower solute concentration to a region of higher concentration in reverse osmosis.
c) The nature of the solvent influences the value of the Ebullioscopic Constant.
d) Mole fraction is a dimensionless quantity
Q-19: Copper ferrocyanide is used as a semipermeable membrane in Berkely Hartley method? How many electrons are present in the t2g orbital of the central metal?
Q-20: Solubility of sodium sulphate in water
a) rises as the temperature rises
b) decreases as temperature rises
c) Unpredictable
d) temperature insensitive
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