POST UTME RHEMA UNIVERSITY 2025 Chemistry | Objective

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Question 1 View Details
A 0.5 M solution of a weak acid HA is titrated with 0.5 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HA?
A. 0.25 M
B. 0.5 M
Correct C. 0.75 M
D. 1 M

Correct Answer: C

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Question 2 View Details
A metal M (atomic number 23) reacts with chlorine gas to form a compound MCl2. If the molar mass of MCl2 is 142.5 g/mol, what is the atomic mass of M?
A. 51.9 g/mol
Correct B. 52.1 g/mol
C. 52.3 g/mol
D. 52.5 g/mol

Correct Answer: B

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Question 3 View Details
A 2.0 M solution of H2SO4 is mixed with 1.0 M NaOH. If the resulting solution is 0.5 M in H2SO4, what is the initial concentration of NaOH?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 4 View Details
A 0.1 M solution of FeCl3 is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the initial concentration of FeCl3?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 5 View Details
A 1.0 M solution of HCl is mixed with 1.0 M NaOH. If the resulting solution is 0.5 M in HCl, what is the initial concentration of NaOH?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 6 View Details
Determine the empirical formula of a compound containing 40.0g of carbon, 6.0g of hydrogen, and 54.0g of oxygen.
Correct A. CH2O
B. C2H4O2
C. C3H6O3
D. C4H8O4

Correct Answer: A

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Question 7 View Details
A 2.50g sample of a non-metallic oxide is dissolved in 50.0mL of 0.100M HCl. If 25.0mL of the resulting solution requires 12.5mL of 0.100M NaOH for neutralization, what is the molar mass of the oxide?
A. 100g/mol
B. 150g/mol
Correct C. 200g/mol
D. 250g/mol

Correct Answer: C

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Question 8 View Details
A 10.0g sample of a polymer is dissolved in 100.0mL of a solvent. If the solution has a vis\cosity of 0.500Pa·s at 25°C, what is the molar mass of the polymer?
A. 1000g/mol
Correct B. 5000g/mol
C. 10000g/mol
D. 20000g/mol

Correct Answer: B

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Question 9 View Details
A 5.00g sample of a compound is heated to 100°C and 1.00atm of pressure. If the resulting gas occupies a volume of 2.00L, what is the molar mass of the compound?
A. 50g/mol
Correct B. 100g/mol
C. 150g/mol
D. 200g/mol

Correct Answer: B

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Question 10 View Details
A 2.00g sample of a compound is mixed with 10.0mL of 0.100M HCl. If the resulting solution requires 5.00mL of 0.100M NaOH for neutralization, what is the molar mass of the compound?
A. 100g/mol
B. 150g/mol
Correct C. 200g/mol
D. 250g/mol

Correct Answer: C

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Question 11 View Details
The atomic radius of an element in the periodic table increases down a group due to the addition of new energy levels. However, the atomic radius of an element in the periodic table decreases across a period due to the increase in effective nuclear charge. Which of the following elements, when placed in a group with the same number of electrons as the element in period 3, group 1, will have the largest atomic radius?
A. Rb
B. Cs
Correct C. Fr
D. Ba

Correct Answer: C

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Question 12 View Details
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
Correct A. 7
B. 6
C. 5
D. 4

Correct Answer: A

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Question 13 View Details
The diagram below shows the structure of a polymer.
A. A is a monomer and B is a polymer
Correct B. A is a polymer and B is a monomer
C. A is a monomer and B is a polymer
D. A is a polymer and B is a polymer

Correct Answer: B

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Question 14 View Details
The reaction below is an example of a ______ reaction.
A. combustion
B. decomposition
Correct C. neutralization
D. oxidation

Correct Answer: C

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Question 15 View Details
The diagram below shows the structure of a biomolecule.
A. A is a nucleus and B is a cell
Correct B. A is a cell and B is a nucleus
C. A is a nucleus and B is a cell
D. A is a cell and B is a cell

Correct Answer: B

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Question 16 View Details
A 2.50 g sample of nitrogen gas is collected over water at 298 K and 1.00 atm. If the partial pressure of water vapor is 0.0313 atm, calculate the number of moles of nitrogen gas collected.
A. 0.100 mol
Correct B. 0.200 mol
C. 0.300 mol
D. 0.400 mol

Correct Answer: B

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Question 17 View Details
The reaction between sulfuric acid and sodium hydroxide is highly exothermic. If 25.0 g of sulfuric acid is mixed with 50.0 g of sodium hydroxide, what is the maximum temperature that can be reached?
A. 50°C
B. 60°C
Correct C. 70°C
D. 80°C

Correct Answer: C

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Question 18 View Details
A 2.00 L flask contains 1.50 atm of oxygen gas at 298 K. If 1.00 atm of oxygen gas is added, what is the new pressure?
A. 1.50 atm
B. 2.00 atm
C. 2.50 atm
Correct D. 3.00 atm

Correct Answer: D

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Question 19 View Details
The reaction between methane and oxygen is highly exothermic. If 10.0 g of methane is mixed with 50.0 g of oxygen, what is the maximum temperature that can be reached?
A. 50°C
B. 60°C
Correct C. 70°C
D. 80°C

Correct Answer: C

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Question 20 View Details
A 2.00 L flask contains 1.50 atm of nitrogen gas at 298 K. If 1.00 atm of nitrogen gas is added, what is the new pressure?
A. 1.50 atm
B. 2.00 atm
C. 2.50 atm
Correct D. 3.00 atm

Correct Answer: D

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Question 21 View Details
Determine the molar mass of a polymer with a repeating unit of C5H8O2. If 25.0 g of the polymer is dissolved in 100.0 mL of water, what is the concentration of the solution in units of mol/L?
A. 0.50 M
Correct B. 1.00 M
C. 2.00 M
D. 3.00 M

Correct Answer: B

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Question 22 View Details
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 0.97 atm
B. 1.00 atm
Correct C. 1.03 atm
D. 1.05 atm

Correct Answer: C

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Question 23 View Details
A 10.0 mL sample of a solution containing 0.50 M NaOH is titrated with 0.25 M HCl. What is the pH of the solution after the reaction is complete?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 24 View Details
A 5.00 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. If the metal has a specific heat capacity of 0.25 J/g°C, what is the energy required to heat the metal?
A. 1250 J
B. 2500 J
Correct C. 3750 J
D. 5000 J

Correct Answer: C

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Question 25 View Details
A 2.00 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 0.97 atm
B. 1.00 atm
Correct C. 1.03 atm
D. 1.05 atm

Correct Answer: C

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