11. A solution contains 0.5 mol of NaCl dissolved in 250 mL of solution. What is the molarity of the solution?
a) 1 M
b) 2 M
c) 0.5 M
d) 4 M
Answer: b) 2 M
12. A solution contains 18 g of glucose (C₆H₁₂O₆) dissolved in 90 g of water. What is the molality of the solution?
(Molecular weight of glucose = 180 g/mol)
a) 0.1 mol/kg
b) 1.0 mol/kg
c) 0.2 mol/kg
d) 2.0 mol/kg
Answer: a) 0.1 mol/kg
13. Which of the following solutions will have the highest molarity if all contain 1 mol of solute?
a) 0.5 L of solution
b) 1 L of solution
c) 2 L of solution
d) 3 L of solution
Answer: a) 0.5 L of solution
Explanation:
Molarity (M) = moles of solute / volume of solution.
14. What will be the molarity of a solution prepared by dissolving 8 g of NaOH in 500 mL of solution?
(Molar mass of NaOH = 40 g/mol)
a) 0.1 M
b) 0.2 M
c) 0.4 M
d) 0.6 M
Answer: c) 0.4 M
15. A solution is prepared by dissolving 5 g of KCl in 100 g of water. The mole fraction of KCl in the solution is:
(Molecular weight of KCl = 74.5 g/mol, water = 18 g/mol)
a) 0.01
b) 0.02
c) 0.05
d) 0.10
Answer: a) 0.01
16. If the molarity of a solution is 0.5 M and the volume of the solution is doubled, what will be the new molarity?
a) 0.25 M
b) 0.5 M
c) 1 M
d) 2 M
Answer: a) 0.25 M
17. What is the normality of a solution of sulfuric acid (H₂SO₄) if the molarity is 2 M?
a) 1 N
b) 2 N
c) 4 N
d) 6 N
Answer: c) 4 N
Explanation:
Normality (N) = molarity (M) × n-factor.
For H₂SO₄, the n-factor is 2 (as it can donate 2 H⁺ ions).
Normality = 2 M×2=4 N
18. A solution is made by dissolving 1 mol of a solute in 100 g of water. If the solution’s density is 1.2 g/mL, what is the molarity of the solution?
a) 5 M
b) 10 M
c) 15 M
d) 20 M
Answer: b) 10 M
19. A solution is prepared by dissolving 4 g of NaOH in 250 mL of solution. What is the molarity of the solution?
(Molecular mass of NaOH = 40 g/mol)
a) 0.1 M
b) 0.2 M
c) 0.4 M
d) 0.5 M
Answer: c) 0.4 M
20. If 20 g of NaOH is dissolved in 200 g of water, what is the molality of the solution?
(Molecular mass of NaOH = 40 g/mol)
a) 1 mol/kg
b) 2.5 mol/kg
c) 3 mol/kg
d) 5 mol/kg
Answer: b) 2.5 mol/kg
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