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POST UTME IGBINEDION UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME IGBINEDION UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 2

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

Correct A. Burette

B. Beaker

C. Test Tube

D. Cylinder

Correct Answer: A

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Question 3

Calculate the molar mass of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.

A. 12.0 g/mol

B. 24.0 g/mol

Correct C. 36.0 g/mol

D. 48.0 g/mol

Correct Answer: C

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Question 4

A diagram of a redox reaction is shown below. Identify the oxidizing agent.

A. Oxidizing Agent

B. Reducing Agent

C. Electron Donor

Correct D. Electron Acceptor

Correct Answer: D

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Question 5

Determine the concentration of a solution containing 25.0 mL of 0.1 M HCl diluted to 100.0 mL.

Correct A. 0.05 M

B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: A

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Question 6

The reaction between nitrogen dioxide and water is an example of a redox reaction. What is the oxidation state of nitrogen in NO2?

A. 0

B. +1

Correct C. +2

D. +3

Correct Answer: C

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Question 7

A sample of oxygen gas at 25°C and 1 atm is compressed to 5 atm. What is the new volume of the gas?

A. 1 L

B. 2 L

Correct C. 5 L

D. 10 L

Correct Answer: C

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Question 8

The half-life of a radioactive subs\tance is 10 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 20 years?

A. 50 g

B. 75 g

Correct C. 87.5 g

D. 100 g

Correct Answer: C

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Question 9

A solution of 2 M HCl is mixed with a solution of 1 M NaOH. 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 10

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the solution

B. To measure the pH of the solution

C. To mix the solutions

D. To filter the solution

Correct Answer: A

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Question 11

The s\tandard reduction potential of the couple Zn2+/Zn is -0.76 V. If a zinc electrode is connected to a copper electrode with a s\tandard reduction potential of +0.34 V, what is the s\tandard cell potential?

Correct A. -1.10 V

B. -0.42 V

C. +0.58 V

D. +1.18 V

Correct Answer: A

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Question 12

A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas?

A. 1.01 x 10^5 Pa

Correct B. 2.53 x 10^5 Pa

C. 3.01 x 10^5 Pa

D. 4.02 x 10^5 Pa

Correct Answer: B

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Question 13

The half-life of a radioactive subs\tance is 5.0 years. If 100 g of the subs\tance is initially present, how much will remain after 20 years?

Correct A. 6.25 g

B. 12.5 g

C. 25.0 g

D. 50.0 g

Correct Answer: A

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Question 14

A solution contains 0.10 M NaCl. What is the concentration of Cl- ions?

A. 0.05 M

Correct B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: B

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Question 15

A 0.50 M solution of HCl is mixed with a 0.50 M solution of NaOH. What is the concentration of the resulting solution?

A. 0.25 M

Correct B. 0.50 M

C. 0.75 M

D. 1.00 M

Correct Answer: B

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Question 16

The reaction of sodium (Na) with water (H2O) produces sodium hydroxide (NaOH) and hydrogen gas (H2). Write the balanced chemical equation for this reaction.

Correct A. 2Na + 2H2O → 2NaOH + H2

B. 2Na + H2O → 2NaOH + 2H2

C. Na + H2O → NaOH + H2

D. 2Na + H2O → NaOH + 2H2

Correct Answer: A

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Question 17

A 2.5 M solution of sodium carbonate (Na2CO3) is mixed with a 1.0 M solution of hydrochloric acid (HCl). What is the concentration of the resulting solution?

A. 1.25 M

Correct B. 2.25 M

C. 3.25 M

D. 4.25 M

Correct Answer: B

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Question 18

A 25 mL sample of a 0.5 M solution of potassium chloride (KCl) is diluted to a total volume of 100 mL. What is the concentration of the resulting solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 19

A 50 mL sample of a 1.0 M solution of calcium hydroxide (Ca(OH)2) is mixed with a 50 mL sample of a 1.0 M solution of hydrochloric acid (HCl). What is the concentration of the resulting solution?

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 20

A 100 mL sample of a 0.5 M solution of sodium nitrate (NaNO3) is mixed with a 100 mL sample of a 0.5 M solution of ammonium chloride (NH4Cl). What is the concentration of the resulting solution?

A. 0.25 M

Correct B. 0.5 M

C. 0.75 M

D. 1.0 M

Correct Answer: B

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Question 21

A 50 mL sample of a 1.0 M solution of potassium hydroxide (KOH) is mixed with a 50 mL sample of a 1.0 M solution of acetic acid (CH3COOH). What is the concentration of the resulting solution?

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 22

A 100 mL sample of a 0.5 M solution of sodium carbonate (Na2CO3) is mixed with a 100 mL sample of a 0.5 M solution of hydrochloric acid (HCl). What is the concentration of the resulting solution?

A. 0.25 M

Correct B. 0.5 M

C. 0.75 M

D. 1.0 M

Correct Answer: B

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Question 23

A 50 mL sample of a 1.0 M solution of calcium chloride (CaCl2) is mixed with a 50 mL sample of a 1.0 M solution of sodium hydroxide (NaOH). What is the concentration of the resulting solution?

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 24

A 100 mL sample of a 0.5 M solution of potassium nitrate (KNO3) is mixed with a 100 mL sample of a 0.5 M solution of ammonium chloride (NH4Cl). What is the concentration of the resulting solution?

A. 0.25 M

B. 0.5 M

C. 0.75 M

D. 1.0 M

Correct Answer: VIEW ANSWER

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Question 25

A polymer is formed by the condensation reaction between a diol and a diacid. If the molar mass of the diol is 90 g/mol and the molar mass of the diacid is 120 g/mol, and the reaction produces 2 moles of water per mole of polymer formed, what is the molar mass of the polymer?

A. 198 g/mol

Correct B. 216 g/mol

C. 234 g/mol

D. 252 g/mol

Correct Answer: B

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