POST UTME LEAD CITY UNIVERSITY 2017 Chemistry | Objective

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Question 1
A 2.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water to make 1.00 L of solution. What is the molarity of the solution if 40.0 g of NaOH is dissolved in 0.500 L of water?
A. 1.00 M
B. 2.00 M
C. 3.00 M
D. 4.00 M
Question 2
What is the pH of a 0.0500 M solution of HCl?
A. 0.0500
B. 1.00
C. 2.00
D. 3.00
Question 3
A sample of a non-metallic element has a mass of 2.5 g and a volume of 2.0 cm^3. What is the density of the element in g/cm^3?
A. 1.25 g/cm^3
B. 1.50 g/cm^3
C. 1.75 g/cm^3
D. 2.00 g/cm^3
Question 4
A 1.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water to make 1.00 L of solution. What is the molarity of the solution if 40.0 g of NaOH is dissolved in 0.500 L of water?
A. 0.500 M
B. 1.00 M
C. 1.50 M
D. 2.00 M
Question 5
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the temperature dep\endence of the dissociation cons\tant is negligible.
A. 1
B. 2
C. 3
D. 4
Question 6
A 2.0 L flask contains 0.5 M HCl. What is the number of moles of HCl in the flask?
A. 0.1 mol
B. 0.5 mol
C. 1.0 mol
D. 2.0 mol
Question 7
The reaction of sulfuric acid with sodium hydroxide is a neutralization reaction. What is the balanced chemical equation for this reaction?
A. H2SO4 + 2NaOH → Na2SO4 + 2H2O
B. H2SO4 + NaOH → NaHSO4 + H2O
C. H2SO4 + 2NaOH → 2NaHSO4 + H2O
D. H2SO4 + NaOH → Na2SO4 + H2O
Question 8
A 25.0-mL sample of 0.100 M NaOH is mixed with 25.0 mL of 0.100 M HCl. Calculate the pH of the resulting solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
A 2.0 L flask contains 0.5 M HCl. What is the concentration of H+ ions in the flask?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 10
A 5.0 M solution of HCl is prepared by dissolving 25 g of HCl in 1000 mL of water. What is the concentration of H+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 1.0 M
D. 10 M
Question 11
A 10% solution of NaOH is prepared by dissolving 10 g of NaOH in 90 g of water. What is the concentration of OH^\( - \) ions in the solution?
A. 10% \( w/v \)
B. 20% \( w/v \)
C. 30% \( w/v \)
D. 40% \( w/v \)
Question 12
A 1.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the volume of the HCl solution in liters?
A. 0.2 L
B. 0.1 L
C. 0.05 L
D. 0.01 L
Question 13
A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in 1000 mL of water. What is the concentration of OH^\( - \) ions in the solution?
A. 0.01 M
B. 0.1 M
C. 1.0 M
D. 10 M
Question 14
A gas at 300 K and 1 atm is compressed to 2 atm. What is the new volume of the gas, assuming ideal behavior?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 15
The reaction of ammonia with oxygen is a combustion reaction. What is the balanced chemical equation for this reaction?
A. 4NH3 + 3O2 → 2N2 + 6H2O
B. 4NH3 + 3O2 → 2NO + 6H2O
C. 4NH3 + 3O2 → 2NO2 + 6H2O
D. 4NH3 + 3O2 → 2NO3 + 6H2O

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