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POST UTME WELLSPRING UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME WELLSPRING UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 2

Calculate the molar mass of a compound with the empirical formula C2H4O.

A. 28

B. 44

Correct C. 60

D. 72

Correct Answer: C

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Question 3

A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the pressure of the gas.

A. 1.5

Correct B. 2.5

C. 3.5

D. 4.5

Correct Answer: B

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Question 4

A 0.1 M solution of NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 25 mL of HCl has been added.

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 5

A diagram of a titration setup is shown below. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Test Tube

Correct Answer: A

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Question 6

Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation (ΔHf°) for Al2O3(s) is -1675.7 kJ/mol, and for Fe2O3(s) is -826.4 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and for Fe(s) is 0 kJ/mol. Assume the reaction occurs at 298 K.

Correct A. -1821.1 kJ/mol

B. -1821.5 kJ/mol

C. -1821.9 kJ/mol

D. -1822.3 kJ/mol

Correct Answer: A

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Question 7

A metal (M) reacts with chlorine gas (Cl2) to form a metal chloride (MCl2). The reaction is: M(s) + Cl2(g) → MCl2(s). If 2.50 g of MCl2 is produced, and the molar mass of MCl2 is 168.3 g/mol, what is the mass of M used in the reaction?

A. 1.67 g

Correct B. 1.72 g

C. 1.77 g

D. 1.82 g

Correct Answer: B

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Question 8

A solution of 0.100 M NaOH is mixed with a solution of 0.100 M HCl. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 9

A sample of 25.0 mL of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the reaction is complete?

A. 7.00

Correct B. 8.00

C. 9.00

D. 10.00

Correct Answer: B

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Question 10

A solution of 0.100 M NaOH is mixed with a solution of 0.100 M HCl. What is the concentration of the resulting solution?

A. 0.100 M

Correct B. 0.0500 M

C. 0.0250 M

D. 0.0125 M

Correct Answer: B

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Question 11

A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?

A. 0.04 M

B. 0.08 M

Correct C. 0.1 M

D. 0.2 M

Correct Answer: C

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Question 12

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to 100 mL. What is the concentration of the polymer solution in g/L?

A. 0.05 g/L

B. 0.1 g/L

Correct C. 0.5 g/L

D. 1 g/L

Correct Answer: C

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Question 13

A 1 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the concentration of the solution in mol/L?

A. 0.1 M

B. 0.5 M

Correct C. 1 M

D. 2 M

Correct Answer: C

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Question 14

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to 100 mL. What is the concentration of the polymer solution in g/L?

A. 0.05 g/L

B. 0.1 g/L

Correct C. 0.5 g/L

D. 1 g/L

Correct Answer: C

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Question 15

A 1 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1000 mL of water. What is the concentration of the solution in mol/L?

A. 0.1 M

B. 0.5 M

Correct C. 1 M

D. 2 M

Correct Answer: C

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Question 16

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to 100 mL. What is the concentration of the polymer solution in g/L?

A. 0.05 g/L

B. 0.1 g/L

Correct C. 0.5 g/L

D. 1 g/L

Correct Answer: C

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Question 17

A 1 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the concentration of the solution in mol/L?

A. 0.1 M

B. 0.5 M

Correct C. 1 M

D. 2 M

Correct Answer: C

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Question 18

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to 100 mL. What is the concentration of the polymer solution in g/L?

A. 0.05 g/L

B. 0.1 g/L

C. 0.5 g/L

D. 1 g/L

Correct Answer: VIEW ANSWER

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Question 19

The rate cons\tant (k) of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?

A. 0.019 M

Correct B. 0.039 M

C. 0.049 M

D. 0.059 M

Correct Answer: B

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Question 20

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

Correct A. -110.5 kJ/mol

B. -130.5 kJ/mol

C. -150.5 kJ/mol

D. -170.5 kJ/mol

Correct Answer: A

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Question 21

A 2.5 M solution of NaOH is prepared by dissolving 2.5 g of NaOH in 100 mL of water. What is the concentration of NaOH in the solution?

A. 0.0625 M

B. 0.125 M

Correct C. 0.25 M

D. 0.5 M

Correct Answer: C

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Question 22

A 1.0 M solution of HCl is prepared by dissolving 1.0 g of HCl in 100 mL of water. What is the concentration of HCl in the solution?

A. 0.0274 M

B. 0.0548 M

Correct C. 0.1096 M

D. 0.218 M

Correct Answer: C

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Question 23

A 2.0 M solution of NaOH is prepared by dissolving 2.0 g of NaOH in 100 mL of water. What is the concentration of NaOH in the solution?

A. 0.05 M

B. 0.1 M

Correct C. 0.2 M

D. 0.4 M

Correct Answer: C

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Question 24

A 1.5 M solution of HCl is prepared by dissolving 1.5 g of HCl in 100 mL of water. What is the concentration of HCl in the solution?

A. 0.0412 M

B. 0.0824 M

Correct C. 0.1648 M

D. 0.3296 M

Correct Answer: C

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Question 25

A 3.0 M solution of NaOH is prepared by dissolving 3.0 g of NaOH in 100 mL of water. What is the concentration of NaOH in the solution?

A. 0.075 M

B. 0.15 M

C. 0.3 M

D. 0.6 M

Correct Answer: VIEW ANSWER

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