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POST UTME BELLS UNIVERSITY 2018 Chemistry | Objective

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Question 1 View Details

The element with atomic number 12 is classified as a metal in the periodic table. What is the name of this element?

Correct A. Magnesium

B. Silicon

C. Manganese

D. Copper

Correct Answer: A

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Question 2 View Details

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?

Correct A. 0.01 M

B. 0.1 M

C. 0.5 M

D. 1.0 M

Correct Answer: A

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Question 3 View Details

A sample of a polymer is analyzed and found to have a molecular weight of 50,000 g/mol. What is the degree of polymerization of the polymer?

A. 10

Correct B. 50

C. 100

D. 500

Correct Answer: B

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Question 4 View Details

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

A. 0.01 M

Correct B. 0.1 M

C. 0.5 M

D. 1.0 M

Correct Answer: B

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Question 5 View Details

A sample of a gas is analyzed and found to have a volume of 2.5 L at a pressure of 1.0 atm and a temperature of 298 K. What is the number of moles of gas present?

A. 0.01 mol

B. 0.1 mol

Correct C. 1.0 mol

D. 10 mol

Correct Answer: C

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Question 6 View Details

The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the term for the minimum amount of solvent required to dissolve a given amount of solute?

A. Critical Micelle Concentration

B. Solubility Limit

Correct C. Minimum Dissolving Solvent

D. Saturated Solution

Correct Answer: C

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Question 7 View Details

A hydrocarbon has the molecular formula C6H14. What is the name of the compound?

Correct A. Hexane

B. Hep\tane

C. Oc\tane

D. Nonane

Correct Answer: A

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Question 8 View Details

A solution contains 2.5 g of NaCl in 100 mL of water. What is the molarity of the solution?

A. 0.25 M

Correct B. 0.5 M

C. 1.0 M

D. 2.0 M

Correct Answer: B

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Question 9 View Details

A sample of air contains 20% oxygen, 70% nitrogen, and 10% carbon dioxide by volume. What is the partial pressure of oxygen in the air at 1 atm total pressure?

Correct A. 0.2 atm

B. 0.4 atm

C. 0.6 atm

D. 0.8 atm

Correct Answer: A

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Question 10 View Details

A 2.0 M solution of HCl is mixed with a 2.0 M solution of 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 11 View Details

Determine the rate cons\tant (k) for the first-order reaction: ln\( [A]t/[A]0 \) = -kt, given that the initial concentration of A is 0.1 M and the concentration at time t is 0.01 M.

Correct A. \( k = \frac{1}{t} lnleft\( \frac{[A]_0}{[A]_t}\right \ \) )

B. \( k = \frac{1}{[A]_0} lnleft\( \frac{[A]_t}{[A]_0}\right \ \) )

C. \( k = \frac{1}{t} lnleft\( \frac{[A]_t}{[A]_0}\right \ \) )

D. \( k = \frac{1}{[A]_t} lnleft\( \frac{[A]_0}{[A]_t}\right \ \) )

Correct Answer: A

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Question 12 View Details

A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. What is the molar mass of the monomer?

Correct A. \( 250 , \text{g/mol} \)

B. \( 500 , \text{g/mol} \)

C. \( 1000 , \text{g/mol} \)

D. \( 2000 , \text{g/mol} \)

Correct Answer: A

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Question 13 View Details

A solution contains 0.1 M NaCl. What is the concentration of Cl^- ions in the solution?

Correct A. \( 0.05 , \text{M} \)

B. \( 0.1 , \text{M} \)

C. \( 0.2 , \text{M} \)

D. \( 0.5 , \text{M} \)

Correct Answer: A

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Question 14 View Details

A buffer solution contains 0.1 M NH4Cl and 0.1 M NH3. What is the pH of the solution?

A. ( 9 )

Correct B. ( 10 )

C. ( 11 )

D. ( 12 )

Correct Answer: B

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Question 15 View Details

A 2.5 L solution contains 0.2 M NaOH. What is the number of moles of NaOH in the solution?

A. \( 0.05 , \text{mol} \)

Correct B. \( 0.1 , \text{mol} \)

C. \( 0.15 , \text{mol} \)

D. \( 0.2 , \text{mol} \)

Correct Answer: B

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Question 16 View Details

The reaction between potassium dichromate and sulfuric acid is a redox reaction. Write the balanced half-equations for the oxidation and reduction reactions.

A. Cr2O72- + 14H+ → 2Cr3+ + 7H2O

B. Cr2O72- + 6H+ → 2Cr3+ + 3H2O

Correct C. Cr2O72- + 8H+ → 2Cr3+ + 4H2O

D. Cr2O72- + 10H+ → 2Cr3+ + 5H2O

Correct Answer: C

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Question 17 View Details

A solution of 0.1 M NaCl is mixed with a solution of 0.1 M AgNO3. What is the concentration of the chloride ion in the resulting solution?

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 18 View Details

A sample of 2.5 g of a subs\tance is dissolved in 50 mL of water. What is the concentration of the 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 19 View Details

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?

A. 1

Correct B. 7

C. 10

D. 14

Correct Answer: B

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Question 20 View Details

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

A. To measure the volume of the solution

B. To mix the solutions

Correct C. To add the titrant

D. To measure the pH of the solution

Correct Answer: C

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Question 21 View Details

A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase in this setup?

Correct A. To separate the components of the mixture

B. To identify the components of the mixture

C. To measure the concentration of the components

D. To determine the pH of the mixture

Correct Answer: A

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Question 22 View Details

A diagram of a spectrophotometer setup is shown below. What is the purpose of the detector in this setup?

Correct A. To measure the absorbance of the solution

B. To measure the transmit\tance of the solution

C. To measure the concentration of the solution

D. To determine the pH of the solution

Correct Answer: A

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Question 23 View Details

A diagram of a distillation setup is shown below. What is the purpose of the condenser in this setup?

A. To separate the components of the mixture

B. To identify the components of the mixture

C. To measure the concentration of the components

D. To determine the pH of the mixture

Correct Answer: VIEW ANSWER

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Question 24 View Details

A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 2.1 g, calculate the percentage yield of the metal oxide.

A. 85%

B. 90%

Correct C. 92%

D. 95%

Correct Answer: C

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Question 25 View Details

The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: NaOH + HCl → NaCl + H2O. If 25 cm3 of 0.1 M NaOH is added to 25 cm3 of 0.1 M HCl, calculate the number of moles of NaCl produced.

A. 0.005 mol

Correct B. 0.01 mol

C. 0.015 mol

D. 0.02 mol

Correct Answer: B

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