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POST UTME IMS U 2023 Chemistry | Objective

Are you preparing for POST UTME IMS U exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

At 298 K, the s\tandard enthalpy of formation of CO2(g) from its elements is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g) from its elements?

Correct A. -110.5 kJ/mol

B. -393.5 kJ/mol

C. -74.8 kJ/mol

D. -283.0 kJ/mol

Correct Answer: A

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Question 2

A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the concentration of the resulting solution?

A. 0.5 M

B. 1.0 M

Correct C. 0.25 M

D. 0.75 M

Correct Answer: C

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Question 3

A metal (M) reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2MO3. If 2.5 g of M is heated in air, what is the volume of O2 consumed?

A. 1.5 L

B. 2.5 L

Correct C. 3.75 L

D. 5.0 L

Correct Answer: C

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Question 4

A solution of glu\cose (C6H12O6) is prepared by dissolving 10 g of glu\cose in 100 mL of water. What is the molarity of the solution?

A. 0.1 M

Correct B. 0.5 M

C. 1.0 M

D. 2.0 M

Correct Answer: B

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Question 5

A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 6

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.

Correct A. -1785.6 kJ/mol

B. -1785.9 kJ/mol

C. -1786.1 kJ/mol

D. -1786.3 kJ/mol

Correct Answer: A

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Question 7

A 2.5 L flask contains 0.15 mol of an unknown gas at 298 K. If the pressure of the gas is 1.5 atm, what is the unknown gas?

A. O2

B. N2

Correct C. CO2

D. H2

Correct Answer: C

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Question 8

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. 8

C. 9

D. 10

Correct Answer: A

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Question 9

The s\tandard enthalpy of formation of CO2(g) is -393.51 kJ/mol. What is the s\tandard enthalpy of combustion of methane (CH4(g))?

Correct A. -890.3 kJ/mol

B. -890.4 kJ/mol

C. -890.5 kJ/mol

D. -890.6 kJ/mol

Correct Answer: A

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Question 10

A 2.0 L flask contains 0.2 mol of an unknown gas at 298 K. If the pressure of the gas is 2.0 atm, what is the unknown gas?

A. O2

B. N2

Correct C. CO2

D. H2

Correct Answer: C

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Question 11

Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \).

Correct A. 2

B. 3

C. 4

D. 5

Correct Answer: A

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Question 12

A 25.0 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH after the addition of 20.0 mL of NaOH.

A. 2

Correct B. 3

C. 4

D. 5

Correct Answer: B

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Question 13

A metal (M) reacts with oxygen to form a basic oxide. The reaction is represented by the equation: 4M + 3O2 → 2M2O3. If 2.5 g of M is heated in air, what is the volume of oxygen required at STP?

A. 1.5 L

B. 2.0 L

Correct C. 2.5 L

D. 3.0 L

Correct Answer: C

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Question 14

A 2.0 L flask contains 1.0 g of CO2 at 25°C. If the pressure of the flask is doubled, what is the new volume of the gas?

A. 1.0 L

B. 1.5 L

Correct C. 2.0 L

D. 2.5 L

Correct Answer: C

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Question 15

A solution of 0.1 M NaCl is prepared by dissolving 0.1 g of NaCl in 100 mL of water. What is the concentration of the solution in terms of molality?

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 16

The rate cons\tant (k) for a first-order reaction is given by the equation: k = 2.303/t \log10\( A0/A \). If the initial concentration of a reac\tant is 0.1 M and the concentration after 10 minutes is 0.05 M, calculate the rate cons\tant (k) for the reaction.

A. 0.0005 min^-1

Correct B. 0.001 min^-1

C. 0.002 min^-1

D. 0.005 min^-1

Correct Answer: B

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Question 17

A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. Calculate the molar mass of the repeating unit.

A. 250 g/mol

Correct B. 500 g/mol

C. 750 g/mol

D. 1000 g/mol

Correct Answer: B

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Question 18

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. Calculate the concentration of Cl^- ions in the solution.

A. 0.01 M

B. 0.05 M

Correct C. 0.1 M

D. 0.5 M

Correct Answer: C

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Question 19

A 1.0 L flask contains 0.5 M H2SO4. If 10 mL of 2.0 M NaOH is added to the flask, what is the concentration of H+ ions in the solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.5 M

D. 1.0 M

Correct Answer: B

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Question 20

A 2.0 L flask contains 0.2 M HCl. If 20 mL of 1.0 M NaOH is added to the flask, what is the concentration of OH^- ions in the solution?

A. 0.01 M

B. 0.02 M

Correct C. 0.05 M

D. 0.1 M

Correct Answer: C

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