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POST UTME SUMMIT UNIVERSITY 2018 Chemistry | Objective

Are you preparing for POST UTME SUMMIT 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 molecular formula of the polymer formed by the condensation reaction between 1,2-ethanediol and 1,4-bu\tanediol.

A. C5H10O2

B. C6H12O3

Correct C. C7H14O4

D. C8H16O5

Correct Answer: C

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Question 2

A 2.5 L flask contains 0.15 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 × 10^5 Pa

Correct B. 1.51 × 10^5 Pa

C. 2.01 × 10^5 Pa

D. 2.51 × 10^5 Pa

Correct Answer: B

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Question 3

The diagram below shows a titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

C. The burette contains the base.

Correct D. The beaker contains the base.

Correct Answer: D

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Question 4

A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 × 10^5 Pa and a temperature of 27°C. Calculate the number of moles of nitrogen gas present.

A. 0.15 mol

Correct B. 0.25 mol

C. 0.35 mol

D. 0.45 mol

Correct Answer: B

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Question 5

The diagram below shows a simple black and white chemistry apparatus showing titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

C. The burette contains the base.

Correct D. The beaker contains the base.

Correct Answer: D

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Question 6

Determine the molar solubility of Ag2CrO4 in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) of Ag2CrO4 is 1.1 × 10^\( -12 \) and the solubility product cons\tant (Ksp) of AgCl is 1.8 × 10^\( -10 \).

A. 1.2 × 10^\( -5 \) M

B. 2.5 × 10^\( -5 \) M

Correct C. 4.8 × 10^\( -5 \) M

D. 6.2 × 10^\( -5 \) M

Correct Answer: C

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Question 7

A 2.50-g sample of a compound containing only carbon and hydrogen is analyzed by combustion and found to contain 1.75 g of carbon and 0.50 g of hydrogen. What is the empirical formula of the compound?

A. CH2

Correct B. C2H4

C. C3H6

D. C4H8

Correct Answer: B

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Question 8

A 0.500-L flask contains 0.250 mol of an ideal gas at 298 K. What is the pressure of the gas in the flask?

A. 0.500 atm

B. 0.750 atm

Correct C. 1.00 atm

D. 1.25 atm

Correct Answer: C

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Question 9

A 2.00-g sample of a metal is dissolved in 10.0 mL of 0.100 M HCl. What is the concentration of the metal ion in the solution?

A. 0.0100 M

B. 0.0200 M

Correct C. 0.0300 M

D. 0.0400 M

Correct Answer: C

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Question 10

A 0.500-g sample of a compound containing only carbon and oxygen is analyzed by combustion and found to contain 0.250 g of carbon and 0.250 g of oxygen. What is the empirical formula of the compound?

Correct A. CO

B. C2O

C. C3O2

D. C4O3

Correct Answer: A

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Question 11

A 0.1 M solution of a weak acid, HA, is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HA?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

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Question 12

The diagram below shows a titration setup. If 25 mL of 0.1 M HCl is added to 20 mL of 0.1 M NaOH, what is the pH of the resulting solution?

A. 7

B. 9

Correct C. 11

D. 13

Correct Answer: C

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Question 13

A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.5 atm, what is the mole \fraction of CO2 in the gas mixture?

A. 0.2

B. 0.3

Correct C. 0.4

D. 0.5

Correct Answer: C

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Question 14

A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 20 mL of HCl is required to reach the equivalence point, what is the number of moles of HCl added?

A. 0.02 mol

Correct B. 0.04 mol

C. 0.06 mol

D. 0.08 mol

Correct Answer: B

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Question 15

The diagram below shows a setup for a gas law experiment. If the initial volume of the gas is 2.0 L and the final volume is 4.0 L, what is the ratio of the final pressure to the initial pressure?

A. 1:2

Correct B. 2:1

C. 3:1

D. 4:1

Correct Answer: B

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Question 16

The boiling point of a solution containing 10 g of urea in 100 g of water is 100.5°C. What is the molar mass of urea?

A. 60 g/mol

B. 90 g/mol

Correct C. 120 g/mol

D. 180 g/mol

Correct Answer: C

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Question 17

A 2.0 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1 L of water. What is the pH of the solution?

A. 12

Correct B. 13

C. 14

D. 15

Correct Answer: B

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Question 18

A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. What is the partial pressure of CO2 in the air at 1 atm?

A. 0.1 atm

Correct B. 0.2 atm

C. 0.3 atm

D. 0.4 atm

Correct Answer: B

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Question 19

A 1.0 L solution of 0.1 M NaCl is prepared by dissolving 0.01 mol of NaCl in 1 L of water. What is the concentration of Cl- ions in the solution?

A. 0.01 M

Correct B. 0.02 M

C. 0.03 M

D. 0.04 M

Correct Answer: B

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Question 20

A 2.0 M solution of HCl is prepared by dissolving 40 g of HCl in 1 L of water. What is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 21

The reaction between 1-bu\tanol and concentrated sulfuric acid is an example of a reaction that proceeds via the mechanism of electrophilic substitution. Which of the following is the correct product of this reaction?

A. 2-bu\tanol

Correct B. 1-butene

C. 2-butene

D. bu\tane

Correct Answer: B

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Question 22

A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If 1.5 mol of the same gas is added to the flask, what is the new pressure of the gas?

A. 3.5 atm

Correct B. 4.5 atm

C. 5.5 atm

D. 6.5 atm

Correct Answer: B

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Question 23

The entropy change (ΔS) for the reaction 2H2(g) + O2(g) → 2H2O(l) is -198 J/K. What is the s\tandard enthalpy change (ΔH) for this reaction?

Correct A. -286 kJ

B. -286 kJ/mol

C. -286 kJ/mol H2

D. -286 kJ/mol O2

Correct Answer: A

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Question 24

A polymer is synthesized from a monomer with the molecular formula C4H8. What is the structure of the polymer?

Correct A. [-CH2-CH2-CH2-CH2-]n

B. [-CH2-CH2-CH2-CH2-CH2-]n

C. [-CH2-CH2-CH2-CH2-CH2-CH2-]n

D. [-CH2-CH2-CH2-CH2-CH2-CH2-CH2-]n

Correct Answer: A

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Question 25

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, what is the mass of the subs\tance remaining after 10 years?

A. 25 g

Correct B. 50 g

C. 75 g

D. 100 g

Correct Answer: B

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