POST UTME AL-HIKMAH UNIVERSITY 2020 Chemistry | Objective

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Question 1
Determine the number of moles of glu\cose (C6H12O6) required to produce 1.5 L of CO2 at STP.
A. 0.1 mol
Correct B. 0.2 mol
C. 0.3 mol
D. 0.4 mol

Correct Answer: B

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Question 2
A 2.5 L sample of a gas at 27°C and 1.5 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas.
A. 2.5 atm
B. 3.5 atm
Correct C. 4.5 atm
D. 5.5 atm

Correct Answer: C

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Question 3
A 25% solution of glu\cose in water is to be diluted to 10% solution by adding 250 mL of water. Calculate the initial volume of the glu\cose solution.
A. 100 mL
B. 200 mL
Correct C. 300 mL
D. 400 mL

Correct Answer: C

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Question 4
A 0.5 M solution of NaOH is to be diluted to 0.1 M solution by adding 200 mL of water. Calculate the initial volume of the NaOH solution.
A. 100 mL
B. 200 mL
Correct C. 300 mL
D. 400 mL

Correct Answer: C

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Question 5
A 2.0 L sample of a gas at 27°C and 1.5 atm is compressed to 0.5 L at 37°C. Calculate the final temperature of the gas.
A. 32°C
B. 37°C
Correct C. 42°C
D. 47°C

Correct Answer: C

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Question 6
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. If the density of the solution is 1.05 g/mL, what is the molarity of the solution?
Correct A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: A

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Question 7
The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is present initially, how much will remain after 15 days?
Correct A. 12.5 mg
B. 25 mg
C. 50 mg
D. 100 mg

Correct Answer: A

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Question 8
A metal oxide, M2O3, has a molar mass of 228 g/mol. If 2.5 g of the oxide is dissolved in 100 mL of water, what is the concentration of the solution in terms of molarity?
A. 0.01 M
Correct B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: B

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Question 9
A 0.1 M solution of HCl is prepared by dissolving 2.5 g of HCl in 100 mL of water. If the density of the solution is 1.05 g/mL, what is the molarity of the solution?
Correct A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: A

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Question 10
A metal, M, has an atomic mass of 55.8 g/mol. If 2.5 g of the metal is dissolved in 100 mL of water, what is the concentration of the solution in terms of molarity?
A. 0.01 M
Correct B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: B

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Question 11
Determine the molar mass of a polymer with the following composition: 25% polyethylene (C2H4), 30% polypropylene (C3H6), and 45% polyvinyl chloride (C2H3Cl).
A. 100 g/mol
B. 120 g/mol
Correct C. 150 g/mol
D. 180 g/mol

Correct Answer: C

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Question 12
A 2.5 M solution of H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.5
Correct B. 2.5
C. 3.5
D. 4.5

Correct Answer: B

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Question 13
A 1.0 M solution of FeCl3 is electrolyzed at a cons\tant current of 2.0 A for 10 minutes. What is the mass of Cl2 gas collected?
A. 0.5 g
Correct B. 1.0 g
C. 1.5 g
D. 2.0 g

Correct Answer: B

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Question 14
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 20 mL of HCl has been added?
A. 7.0
Correct B. 8.0
C. 9.0
D. 10.0

Correct Answer: B

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Question 15
A 1.0 M solution of KNO3 is electrolyzed at a cons\tant current of 1.0 A for 5 minutes. What is the mass of O2 gas collected?
A. 0.5 g
Correct B. 1.0 g
C. 1.5 g
D. 2.0 g

Correct Answer: B

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Question 16
Determine the solubility of silver chloride (AgCl) in water at 25°C, given that the solubility product cons\tant (Ksp) is 1.8 × 10^-10. The molar solubility of AgCl is denoted by 's'.
Correct A. 1.0 × 10^-5 M
B. 1.0 × 10^-6 M
C. 1.0 × 10^-7 M
D. 1.0 × 10^-8 M

Correct Answer: A

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Question 17
A 25.0 g sample of a metal (M) is heated in a crucible until it melts. The mass of the crucible and the metal is 25.5 g. The mass of the crucible alone is 10.0 g. What is the molar mass of the metal (M)?
A. 50.0 g/mol
B. 60.0 g/mol
Correct C. 70.0 g/mol
D. 80.0 g/mol

Correct Answer: C

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Question 18
A 2.00 M solution of sodium hydroxide (NaOH) is titrated with a 1.00 M solution of hydrochloric acid (HCl). If 25.0 mL of the HCl solution is required to reach the equivalence point, what is the volume of the NaOH solution required to reach the equivalence point?
A. 50.0 mL
B. 75.0 mL
Correct C. 100.0 mL
D. 125.0 mL

Correct Answer: C

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Question 19
A diagram of the periodic table is shown below. Identify the group number of the element with atomic number 12.
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 20
A diagram of a chemical apparatus is shown below. Identify the purpose of the apparatus.
Correct A. To measure the volume of a liquid
B. To measure the mass of a solid
C. To measure the temperature of a solution
D. To measure the pH of a solution

Correct Answer: A

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Question 21
A mixture of 2.00 g of an unknown gas and 3.00 g of oxygen is heated to 100°C at 1.00 atm. If the total pressure is 2.00 atm, what is the partial pressure of the unknown gas?
A. 0.50 atm
Correct B. 1.00 atm
C. 1.50 atm
D. 2.00 atm

Correct Answer: B

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Question 22
The reaction between sodium and chlorine produces a white solid. If 2.50 g of sodium reacts with 1.50 g of chlorine, what is the limiting reac\tant?
Correct A. sodium
B. chlorine
C. neither
D. both

Correct Answer: A

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Question 23
A solution of 2.00 M hydrochloric acid is mixed with a solution of 1.00 M sodium hydroxide. What is the resulting pH?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 24
A sample of 1.00 g of an unknown hydrocarbon is burned in a combustion reaction. If 1.50 g of carbon dioxide is produced, what is the empirical formula of the hydrocarbon?
Correct A. C2H6
B. C3H8
C. C4H10
D. C5H12

Correct Answer: A

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Question 25
A solution of 1.00 M sodium chloride is mixed with a solution of 2.00 M calcium chloride. What is the resulting concentration of calcium ions?
A. 0.50 M
Correct B. 1.00 M
C. 1.50 M
D. 2.00 M

Correct Answer: B

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