Q. Which of the following has the highest freezing point depression?
-
A.
0.1 molal NaCl
-
B.
0.1 molal KBr
-
C.
0.1 molal CaCl2
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D.
0.1 molal glucose
Solution
CaCl2 dissociates into 3 ions (Ca2+ and 2 Cl-), resulting in the highest freezing point depression.
Correct Answer: C — 0.1 molal CaCl2
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Q. Which of the following has the lowest vapor pressure?
-
A.
Pure water
-
B.
0.1 M NaCl solution
-
C.
0.1 M KCl solution
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D.
0.1 M glucose solution
Solution
The 0.1 M NaCl and KCl solutions will have lower vapor pressures than pure water due to the presence of solute particles.
Correct Answer: B — 0.1 M NaCl solution
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Q. Which of the following is a consequence of Raoult's Law in a binary solution?
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A.
The total vapor pressure is the sum of the partial pressures.
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B.
The total vapor pressure is always lower than the vapor pressure of the pure solvent.
-
C.
The mole fraction of the solute is always greater than that of the solvent.
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D.
The boiling point of the solution is always higher than that of the pure solvent.
Solution
According to Raoult's Law, the total vapor pressure of a binary solution is the sum of the partial pressures of each component.
Correct Answer: A — The total vapor pressure is the sum of the partial pressures.
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Q. Which of the following is a correct application of Raoult's Law?
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A.
Calculating the boiling point elevation
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B.
Determining the freezing point depression
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C.
Finding the vapor pressure of a solution
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D.
Measuring the solubility of a gas in a liquid
Solution
Raoult's Law is used to find the vapor pressure of a solution based on the vapor pressures of its components.
Correct Answer: C — Finding the vapor pressure of a solution
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Q. Which of the following is a correct unit for concentration?
-
A.
Molarity
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B.
Molality
-
C.
Mass percent
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D.
All of the above
Solution
All listed options are valid units for concentration.
Correct Answer: D — All of the above
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Q. Which of the following is a correct unit for molality?
-
A.
mol/L
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B.
mol/kg
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C.
mol/mL
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D.
mol/1000g
Solution
Molality is defined as moles of solute per kilogram of solvent, hence the unit is mol/kg.
Correct Answer: B — mol/kg
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Q. Which of the following is a limitation of Raoult's Law?
-
A.
It applies to all solutions.
-
B.
It is valid for ideal solutions only.
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C.
It does not consider temperature effects.
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D.
It is applicable to non-volatile solutes only.
Solution
Raoult's Law is primarily valid for ideal solutions, where the interactions between molecules are similar to those in the pure components.
Correct Answer: B — It is valid for ideal solutions only.
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Q. Which of the following is a unit of concentration that expresses the amount of solute per volume of solution?
-
A.
Molarity
-
B.
Molality
-
C.
Mole fraction
-
D.
Normality
Solution
Molarity is defined as moles of solute per liter of solution.
Correct Answer: A — Molarity
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Q. Which of the following is NOT a condition for Raoult's Law to be applicable?
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A.
The solution must be ideal.
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B.
The solute must be non-volatile.
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C.
The components must be miscible in all proportions.
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D.
The solution must be at high pressure.
Solution
Raoult's Law is applicable under conditions of ideal solutions, and high pressure is not a requirement.
Correct Answer: D — The solution must be at high pressure.
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Q. Which of the following is NOT a condition for Raoult's Law to hold true?
-
A.
The solution must be ideal.
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B.
The solute must be volatile.
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C.
The solute and solvent must be miscible.
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D.
The temperature must be constant.
Solution
Raoult's Law applies to ideal solutions, and it is not necessary for the solute to be volatile.
Correct Answer: B — The solute must be volatile.
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Q. Which of the following is NOT a factor affecting solubility?
-
A.
Temperature
-
B.
Pressure
-
C.
Nature of solute and solvent
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D.
Color of solute
Solution
Color of solute does not affect its solubility; solubility is influenced by temperature, pressure, and the nature of solute and solvent.
Correct Answer: D — Color of solute
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Q. Which of the following is NOT a factor affecting the solubility of a solute in a solvent?
-
A.
Temperature
-
B.
Pressure
-
C.
Nature of solute and solvent
-
D.
Color of solute
Solution
The color of the solute does not affect its solubility; solubility is influenced by temperature, pressure, and the nature of the solute and solvent.
Correct Answer: D — Color of solute
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Q. Which of the following is the correct unit for molality?
-
A.
mol/L
-
B.
mol/kg
-
C.
mol/mL
-
D.
mol/1000g
Solution
Molality is defined as moles of solute per kilogram of solvent, hence the unit is mol/kg.
Correct Answer: B — mol/kg
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Q. Which of the following is the correct unit for molarity?
-
A.
mol/L
-
B.
mol/kg
-
C.
g/L
-
D.
g/mol
Solution
Molarity is defined as moles of solute per liter of solution, hence the unit is mol/L.
Correct Answer: A — mol/L
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Q. Which of the following is true about a saturated solution?
-
A.
It contains more solute than can dissolve
-
B.
It contains less solute than can dissolve
-
C.
It is always at boiling point
-
D.
It is always at freezing point
Solution
A saturated solution contains the maximum amount of solute that can dissolve at a given temperature.
Correct Answer: A — It contains more solute than can dissolve
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Q. Which of the following solutions has the highest boiling point?
-
A.
0.1 M NaCl
-
B.
0.1 M KCl
-
C.
0.1 M CaCl2
-
D.
0.1 M glucose
Solution
CaCl2 dissociates into 3 ions (Ca^2+ and 2 Cl^-), leading to the highest boiling point elevation among the options.
Correct Answer: C — 0.1 M CaCl2
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Q. Which of the following solutions has the highest concentration?
-
A.
0.1 M NaCl
-
B.
0.2 M KCl
-
C.
0.05 M CaCl2
-
D.
0.3 M MgSO4
Solution
Concentration in terms of molarity: 0.1 M NaCl = 0.1, 0.2 M KCl = 0.2, 0.05 M CaCl2 = 0.15 (0.05*3), 0.3 M MgSO4 = 0.3. Highest is 0.3 M MgSO4.
Correct Answer: D — 0.3 M MgSO4
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Q. Which of the following solutions will have the highest boiling point?
-
A.
0.1 M NaCl
-
B.
0.1 M KCl
-
C.
0.1 M glucose
-
D.
0.1 M MgCl2
Solution
0.1 M MgCl2 will have the highest boiling point due to the highest van 't Hoff factor (i = 3).
Correct Answer: D — 0.1 M MgCl2
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Q. Which of the following solutions will have the lowest freezing point?
-
A.
0.1 M NaCl
-
B.
0.1 M KBr
-
C.
0.1 M MgCl2
-
D.
0.1 M glucose
Solution
MgCl2 dissociates into 3 ions, leading to the greatest freezing point depression among the options.
Correct Answer: C — 0.1 M MgCl2
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Q. Which of the following solutions will have the lowest vapor pressure?
-
A.
0.1 M NaCl
-
B.
0.1 M KBr
-
C.
0.1 M MgCl2
-
D.
0.1 M glucose
Solution
MgCl2 dissociates into 3 ions, leading to the highest number of solute particles and thus the lowest vapor pressure.
Correct Answer: C — 0.1 M MgCl2
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Q. Which of the following statements about colligative properties is true?
-
A.
They depend on the identity of the solute
-
B.
They depend on the number of solute particles
-
C.
They are independent of temperature
-
D.
They are only applicable to ionic compounds
Solution
Colligative properties depend on the number of solute particles in a solution, not their identity.
Correct Answer: B — They depend on the number of solute particles
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Q. Which of the following statements about ideal solutions is true?
-
A.
They obey Raoult's law at all concentrations
-
B.
They have a constant boiling point
-
C.
They have a constant density
-
D.
They do not exhibit colligative properties
Solution
Ideal solutions obey Raoult's law at all concentrations, meaning their vapor pressures are proportional to the mole fractions.
Correct Answer: A — They obey Raoult's law at all concentrations
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Q. Which of the following statements about molarity is true?
-
A.
It changes with temperature.
-
B.
It is independent of temperature.
-
C.
It is defined as moles of solute per liter of solvent.
-
D.
It is always equal to molality.
Solution
Molarity is defined as moles of solute per liter of solution, and it can change with temperature due to volume changes.
Correct Answer: A — It changes with temperature.
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Q. Which of the following statements about solutions is incorrect?
-
A.
Solutes lower the vapor pressure of solvents.
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B.
Colligative properties depend on the type of solute.
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C.
Boiling point elevation is a colligative property.
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D.
Freezing point depression is a colligative property.
Solution
Colligative properties depend on the number of solute particles, not their type.
Correct Answer: B — Colligative properties depend on the type of solute.
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Q. Which of the following statements is true according to Raoult's Law?
-
A.
The vapor pressure of a solution is always higher than that of the pure solvent.
-
B.
The vapor pressure of a solution is lower than that of the pure solvent.
-
C.
Raoult's Law applies only to ideal solutions.
-
D.
The mole fraction of solute affects the vapor pressure of the solvent.
Solution
Raoult's Law indicates that the vapor pressure of a solution is lower than that of the pure solvent due to the presence of solute.
Correct Answer: B — The vapor pressure of a solution is lower than that of the pure solvent.
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Q. Which of the following statements is true regarding a saturated solution?
-
A.
It contains more solute than solvent.
-
B.
It is in dynamic equilibrium.
-
C.
It can dissolve more solute.
-
D.
It is always at room temperature.
Solution
A saturated solution is in dynamic equilibrium where the rate of dissolution equals the rate of crystallization.
Correct Answer: B — It is in dynamic equilibrium.
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Q. Which of the following statements is true regarding colligative properties?
-
A.
They depend on the identity of the solute
-
B.
They depend on the concentration of the solute
-
C.
They depend on the nature of the solvent
-
D.
They depend on the number of solute particles
Solution
Colligative properties depend on the number of solute particles, not their identity.
Correct Answer: D — They depend on the number of solute particles
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Q. Which of the following statements is true regarding ideal solutions?
-
A.
They obey Raoult's Law at all concentrations.
-
B.
They do not exhibit any deviation from Raoult's Law.
-
C.
They have a constant boiling point.
-
D.
They have a variable composition.
Solution
Ideal solutions obey Raoult's Law without any deviation, meaning their properties are consistent with the law across all concentrations.
Correct Answer: B — They do not exhibit any deviation from Raoult's Law.
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Q. Which of the following statements is true regarding non-ideal solutions?
-
A.
They obey Raoult's Law perfectly.
-
B.
They show positive or negative deviations from Raoult's Law.
-
C.
Their vapor pressure is always higher than predicted by Raoult's Law.
-
D.
They cannot be formed by mixing two volatile liquids.
Solution
Non-ideal solutions show positive or negative deviations from Raoult's Law due to interactions between different molecules.
Correct Answer: B — They show positive or negative deviations from Raoult's Law.
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Q. Which of the following statements is true regarding Raoult's Law?
-
A.
It applies to all types of solutions.
-
B.
It is only applicable to ideal solutions.
-
C.
It can be used for any solute-solvent combination.
-
D.
It is not applicable to volatile solutes.
Solution
Raoult's Law is primarily applicable to ideal solutions, where the solute and solvent behave similarly.
Correct Answer: B — It is only applicable to ideal solutions.
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