91. A solution has a density of 1.1 g/mL and contains 20% by weight of NaCl. What is the molality of the solution?
(Molecular weight of NaCl = 58.5 g/mol)
a) 3.3 mol/kg
b) 4.5 mol/kg
c) 5.7 mol/kg
d) 6.2 mol/kg
Answer: b) 4.5 mol/kg
92. Which of the following is true for a solution with a molarity of 1 M?
a) It contains 1 mole of solute per 1 kg of solvent
b) It contains 1 mole of solute per 1 liter of solvent
c) It contains 1 mole of solute per 1 liter of solution
d) It contains 1 mole of solute per 1 mL of solution
Answer: c) It contains 1 mole of solute per 1 liter of solution
Explanation:
Molarity is defined as the number of moles of solute per liter of solution.
93. If 0.5 moles of NaOH is dissolved in 2 liters of solution, what is the molarity?
a) 0.25 M
b) 0.5 M
c) 1 M
d) 2 M
Answer: a) 0.25 M
94. A solution is prepared by dissolving 36.5 g of HCl in water to make 1 L of solution. What is its molarity?
(Molecular weight of HCl = 36.5 g/mol)
a) 0.5 M
b) 1 M
c) 2 M
d) 3 M
Answer: b) 1 M
95. What is the normality of a solution prepared by dissolving 40 g of NaOH in 500 mL of solution?
(Molecular weight of NaOH = 40 g/mol)
a) 1 N
b) 2 N
c) 3 N
d) 4 N
Answer: b) 2 N
96. If 2.7 g of AlCl₃ is dissolved in water to prepare 200 mL of solution, what is the molarity of the solution?
(Molecular weight of AlCl₃ = 133.5 g/mol)
a) 0.1 M
b) 0.2 M
c) 0.3 M
d) 0.4 M
Answer: a) 0.1 M
97. If 0.25 moles of solute is dissolved in 500 g of water, what is the molality of the solution?
a) 0.25 mol/kg
b) 0.5 mol/kg
c) 0.75 mol/kg
d) 1 mol/kg
Answer: b) 0.5 mol/kg
98. What is the mole fraction of water in a solution containing 18 g of water and 46 g of ethanol?
(Molecular weight of water = 18 g/mol, ethanol = 46 g/mol)
a) 0.25
b) 0.5
c) 0.75
d) 0.33
Answer: b) 0.5
99. What is the boiling point elevation for a solution containing 0.5 mol of NaCl in 1 kg of water?
(K_b for water = 0.52°C kg/mol)
a) 0.26°C
b) 0.52°C
c) 1.04°C
d) 1.56°C
Answer: c) 1.04°C
100. The freezing point depression for a 1 M NaCl solution is greater than that for a 1 M glucose solution because:
a) NaCl has a higher molecular weight than glucose
b) NaCl dissociates into ions, increasing the number of particles
c) Glucose dissociates into ions, increasing the number of particles
d) NaCl has a lower molecular weight than glucose
Answer: b) NaCl dissociates into ions, increasing the number of particles
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