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POST UTME BOWEN UNIVERSITY 2021 Chemistry | Objective

Are you preparing for POST UTME BOWEN 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

A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. Calculate the change in entropy of the gas.

A. 10 J/K

B. 20 J/K

Correct C. 30 J/K

D. 40 J/K

Correct Answer: C

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Question 2

The rate cons\tant of a first-order reaction is 0.05 min^-1. Calculate the half-life of the reaction.

A. 10 min

B. 20 min

Correct C. 30 min

D. 40 min

Correct Answer: C

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Question 3

A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 4

A metal rod is placed in a solution of CuSO4. The rod is made of a metal that is more reactive than copper. What will happen to the rod?

A. The rod will dissolve in the solution.

B. The rod will not react with the solution.

Correct C. The rod will oxidize and form a layer of copper.

D. The rod will reduce the copper ions in the solution.

Correct Answer: C

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Question 5

A sample of air is collected over water and has a volume of 2.5 L at 25°C and 1 atm. Calculate the partial pressure of the water vapor in the air.

A. 0.2 atm

Correct B. 0.3 atm

C. 0.4 atm

D. 0.5 atm

Correct Answer: B

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Question 6

The reaction of nitrogen dioxide with water is represented by the equation: \( 2NO_2\( g \ \) + H_2O(l) \rightarrow HNO_3(aq) + NO(g) ). What is the value of \( Delta H^{circ} \) for this reaction, given that \( Delta H^{circ}_{f}\( NO_2 \ \) = -111.3 , kJ/mol ), \( Delta H^{circ}_{f}\( H_2O \ \) = -285.8 , kJ/mol ), \( Delta H^{circ}_{f}\( HNO_3 \ \) = -205.0 , kJ/mol ), and \( Delta H^{circ}_{f}\( NO \ \) = 90.3 , kJ/mol )?

Correct A. -217.8 kJ/mol

B. -217.3 kJ/mol

C. -217.9 kJ/mol

D. -217.2 kJ/mol

Correct Answer: A

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Question 7

A 2.50-g sample of a polymer is dissolved in 50.0 mL of a solvent. The resulting solution has a concentration of 0.500 M. What is the molar mass of the polymer?

A. 500 g/mol

Correct B. 1000 g/mol

C. 2000 g/mol

D. 4000 g/mol

Correct Answer: B

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Question 8

A 1.00-L sample of a gas at 25.0°C and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. What is the new volume of the gas?

A. 0.500 L

Correct B. 1.00 L

C. 2.00 L

D. 4.00 L

Correct Answer: B

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Question 9

The half-life of a radioactive subs\tance is 5.00 years. If a sample initially contains 100 g of the subs\tance, what is the mass remaining after 10.0 years?

Correct A. 12.5 g

B. 25.0 g

C. 50.0 g

D. 100 g

Correct Answer: A

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Question 10

A 2.00-g sample of a subs\tance is dissolved in 100.0 mL of a solvent. The resulting solution has a concentration of 0.200 M. What is the molar mass of the subs\tance?

A. 100 g/mol

Correct B. 200 g/mol

C. 400 g/mol

D. 800 g/mol

Correct Answer: B

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Question 11

The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. Calculate the half-life \( t1/2 \) of the reaction.

A. 0.15 min

B. 0.30 min

Correct C. 0.60 min

D. 1.20 min

Correct Answer: C

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Question 12

A sample of nitrogen gas (N2) has a volume of 2.5 L at a pressure of 1.2 atm. Calculate the number of moles of N2 present.

A. 0.05 mol

Correct B. 0.10 mol

C. 0.15 mol

D. 0.20 mol

Correct Answer: B

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Question 13

The reaction between sulfuric acid (H2SO4) and sodium hydroxide (NaOH) is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 25.0 g of H2SO4 is added to 100.0 mL of 1.0 M NaOH, what is the limiting reac\tant?

Correct A. H2SO4

B. NaOH

C. Neither

D. Both

Correct Answer: A

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Question 14

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.

A. 100 g/mol

B. 200 g/mol

Correct C. 500 g/mol

D. 1000 g/mol

Correct Answer: C

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Question 15

A solution of 0.10 M NaCl is prepared by dissolving 10.0 g of NaCl in 1.0 L of water. Calculate the concentration of Cl- ions in the solution.

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 16

The solubility of a sparingly soluble salt, M2X (where M is a univalent cation and X is a divalent anion), in water is 1.2 × 10^\( -3 \) g/L at 25°C. If 100 mL of a 0.1 M MCl solution is mixed with 100 mL of a 0.2 M Na2X solution, what is the concentration of the resulting solution?

A. 0.15 M

B. 0.20 M

Correct C. 0.25 M

D. 0.30 M

Correct Answer: C

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Question 17

A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of the HCl solution is added to 100 mL of the NaOH solution, what is the pH of the resulting solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 18

The rate cons\tant (k) for 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?

Correct A. 0.05 M

B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: A

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Question 19

A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. If 50 mL of the H2SO4 solution is added to 100 mL of the NaOH solution, what is the pH of the resulting solution?

A. 1.0

B. 2.0

Correct C. 3.0

D. 4.0

Correct Answer: C

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Question 20

A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of the HCl solution is added to 100 mL of the NaOH solution, what is the concentration of the resulting solution?

A. 0.15 M

B. 0.20 M

Correct C. 0.25 M

D. 0.30 M

Correct Answer: C

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Question 21

The rate cons\tant (k) for 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?

Correct A. 0.05 M

B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: A

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Question 22

A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. If 50 mL of the H2SO4 solution is added to 100 mL of the NaOH solution, what is the pH of the resulting solution?

A. 1.0

B. 2.0

Correct C. 3.0

D. 4.0

Correct Answer: C

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Question 23

A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of the HCl solution is added to 100 mL of the NaOH solution, what is the concentration of the resulting solution?

A. 0.15 M

B. 0.20 M

Correct C. 0.25 M

D. 0.30 M

Correct Answer: C

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Question 24

The rate cons\tant (k) for 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. 0.05 M

B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: VIEW ANSWER

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Question 25

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

A. 1.0 x 10^-5 M

Correct B. 2.0 x 10^-5 M

C. 3.0 x 10^-5 M

D. 4.0 x 10^-5 M

Correct Answer: B

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