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POST UTME MADONNA UNIVERSITY 2018 Chemistry | Objective

Are you preparing for POST UTME MADONNA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the molar solubility of CaF2 in a 0.1 M solution of NaF.

Correct A. 1.0 x 10^-3 M

B. 1.0 x 10^-4 M

C. 1.0 x 10^-5 M

D. 1.0 x 10^-6 M

Correct Answer: A

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Question 2

A 2.5 L flask contains 0.5 mol of CO2 at 298 K. Calculate the partial pressure of CO2.

A. 0.1 atm

Correct B. 0.5 atm

C. 1.0 atm

D. 2.0 atm

Correct Answer: B

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Question 3

The diagram below shows a titration setup for determining the concentration of a strong acid.

A. pH 7

B. pH 10

C. pH 12

Correct D. pH 14

Correct Answer: D

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Question 4

A 1.0 L solution contains 0.2 mol of NaCl. Calculate the concentration of Na+ ions in the 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 5

The diagram below shows a setup for determining the concentration of a strong base.

A. pH 7

B. pH 10

C. pH 12

Correct D. pH 14

Correct Answer: D

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Question 6

Determine the oxidation state of the underlined atom in the compound [Cr(H2O)6]Cl3.

Correct A. +3

B. +2

C. +6

D. +1

Correct Answer: A

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Question 7

Calculate the pH of a 0.1 M solution of HCl after 10 mL of 0.1 M NaOH has been added to it.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 8

The diagram below shows a titration setup. If 25 mL of 0.1 M NaOH has been added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 9

A 2.0 g sample of an organic compound containing only carbon and hydrogen is burned in a combustion calorimeter. If 1.2 g of CO2 is produced, what is the empirical formula of the compound?

A. C2H4

Correct B. C2H6

C. C3H6

D. C3H8

Correct Answer: B

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Question 10

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. If 25 mL of 0.1 M NaOH has been added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 11

A sample of n-hexane (C6H14) is subjected to a reaction with chlorine gas (Cl2) in the presence of light. The reaction is as follows: C6H14 + Cl2 → C6H13Cl + HCl. What is the major product of this reaction?

Correct A. C6H13Cl

B. C6H12Cl2

C. C6H11Cl3

D. C6H10Cl4

Correct Answer: A

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Question 12

The following diagram shows a titration setup. What is the purpose of the burette in this setup?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To filter the solution

Correct Answer: A

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Question 13

A polymer is a long chain of repeating units called monomers. What is the name of the process by which a polymer is formed from its monomers?

Correct A. Polymerization

B. Depolymerization

C. Condensation

D. Hydrolysis

Correct Answer: A

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Question 14

The following diagram shows a simple black and white chemistry apparatus showing a titration setup. What is the purpose of the pipette in this setup?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To filter the solution

Correct Answer: A

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Question 15

A sample of a metal (M) reacts with hydrochloric acid (HCl) to produce a salt (MCl) and hydrogen gas (H2). What is the name of the reaction?

Correct A. Single displacement reaction

B. Double displacement reaction

C. Combination reaction

D. Decomposition reaction

Correct Answer: A

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Question 16

A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the initial volume of the acid in liters.

A. 0.05 L

Correct B. 0.1 L

C. 0.2 L

D. 0.5 L

Correct Answer: B

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Question 17

A 2.5 g sample of a subs\tance is dissolved in 25 mL of water. The resulting solution has a density of 1.2 g/mL. Calculate the molarity of the solution.

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 2.0 M

Correct Answer: C

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Question 18

A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 0.5 L at 50°C. Calculate the final pressure of the gas.

A. 2 atm

Correct B. 4 atm

C. 6 atm

D. 8 atm

Correct Answer: B

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Question 19

A 100 mL sample of a 0.1 M solution of NaOH is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. Calculate the initial volume of the acid in liters.

A. 0.05 L

Correct B. 0.1 L

C. 0.2 L

D. 0.5 L

Correct Answer: B

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Question 20

A 2.5 g sample of a subs\tance is dissolved in 25 mL of water. The resulting solution has a density of 1.2 g/mL. Calculate the molarity of the solution.

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 2.0 M

Correct Answer: C

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Question 21

A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 0.5 L at 50°C. Calculate the final pressure of the gas.

A. 2 atm

Correct B. 4 atm

C. 6 atm

D. 8 atm

Correct Answer: B

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Question 22

A 100 mL sample of a 0.1 M solution of NaOH is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. Calculate the initial volume of the acid in liters.

A. 0.05 L

Correct B. 0.1 L

C. 0.2 L

D. 0.5 L

Correct Answer: B

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Question 23

A 2.5 g sample of a subs\tance is dissolved in 25 mL of water. The resulting solution has a density of 1.2 g/mL. Calculate the molarity of the solution.

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 2.0 M

Correct Answer: C

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Question 24

Determine the number of moles of $\text{O}_2$ that react with 2.50 moles of $\text{C}_2\text{H}_6$ according to the equation $\text{C}_2\text{H}_6 + \frac{7}{2}\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O}$.

A. 1.75 moles

Correct B. 2.25 moles

C. 2.50 moles

D. 3.00 moles

Correct Answer: B

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Question 25

A 2.50 g sample of an organic compound containing only carbon and hydrogen is analyzed by combustion and found to produce 3.00 g of $\text{CO}_2$ and 1.50 g of $\text{H}_2\text{O}$. What is the empirical formula of the compound?

A. $\text{C}_2\text{H}_6$

B. $\text{C}_3\text{H}_8$

Correct C. $\text{C}_4\text{H}_{10}$

D. $\text{C}_5\text{H}_{12}$

Correct Answer: C

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