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POST UTME AL-HIKMAH UNIVERSITY 2018 Chemistry | Objective

Are you preparing for POST UTME AL-HIKMAH 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 mass of a polymer with the following monomer units: CH2=CH-CH3, CH2=CH-CH2-CH3, and CH2=CH-CH2-CH2-CH3. Assume that the polymer has a degree of polymerization of 100.

A. 500 g/mol

B. 750 g/mol

Correct C. 1000 g/mol

D. 1500 g/mol

Correct Answer: C

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Question 2

A 0.1 M solution of NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the molarity of the solution after 10 mL of the solution is diluted to 50 mL with water?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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Question 3

A 2.0 L flask contains 1.0 atm of N2 and 3.0 atm of O2 at 298 K. What is the partial pressure of O2 in the flask?

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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Question 4

A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the pH of the solution?

A. 0.5

Correct B. 1.0

C. 1.5

D. 2.0

Correct Answer: B

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Question 5

A 2.0 L flask contains 1.0 atm of CO2 at 298 K. What is the partial pressure of CO2 in the flask?

A. 1.0 atm

B. 1.5 atm

Correct C. 2.0 atm

D. 2.5 atm

Correct Answer: C

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Question 6

Determine the number of stereocenters in the compound below. If the compound is chiral, indicate the configuration of each stereocenter.

Correct A. 2 stereocenters, R,R configuration

B. 2 stereocenters, S,S configuration

C. 1 stereocenter, R configuration

D. 1 stereocenter, S configuration

Correct Answer: A

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Question 7

Calculate the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 8

A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. Calculate the pressure of the gas.

A. 10 atm

Correct B. 20 atm

C. 30 atm

D. 40 atm

Correct Answer: B

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Question 9

A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 10

A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. Calculate the volume of the gas at a temperature of 400 K.

A. 5 L

Correct B. 10 L

C. 15 L

D. 20 L

Correct Answer: B

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Question 11

The rate cons\tant of a first-order reaction is 0.025 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?

Correct A. 0.05 M

B. 0.025 M

C. 0.1 M

D. 0.05 M

Correct Answer: A

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Question 12

A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl_2 -> MX_2. If 2.5 g of M reacts with 1.5 g of Cl_2, what is the mass of MX_2 formed?

Correct A. 3.75 g

B. 2.5 g

C. 1.5 g

D. 4.5 g

Correct Answer: A

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Question 13

The pH of a solution is 4.5. What is the concentration of hydrogen ions in the solution?

A. 1.0 x 10^-5 M

Correct B. 1.0 x 10^-4 M

C. 1.0 x 10^-3 M

D. 1.0 x 10^-2 M

Correct Answer: B

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Question 14

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 15

A metal M has a density of 7.5 g/cm^3. If a 2.5 cm^3 sample of the metal has a mass of 17.5 g, what is the molar mass of the metal?

A. 100 g/mol

B. 200 g/mol

Correct C. 300 g/mol

D. 400 g/mol

Correct Answer: C

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Question 16

Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH, assuming complete neutralization.

Correct A. 3

B. 7

C. 10

D. 12

Correct Answer: A

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Question 17

A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5 mL

B. 25 mL

Correct C. 37.5 mL

D. 50 mL

Correct Answer: C

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Question 18

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the concentration of the resulting solution after mixing 10 mL of each?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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Question 19

A 10 mL sample of 0.5 M HCl is mixed with 10 mL of 0.5 M NaOH. What is the resulting pH?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 20

A 25 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the pH at the equivalence point.

A. 7

B. 8

C. 9

Correct D. 10

Correct Answer: D

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Question 21

A polymer is formed by the condensation reaction between two monomers, A and B. If the molecular weight of the polymer is 500 g/mol, and the molecular weights of monomers A and B are 150 g/mol and 200 g/mol, respectively, what is the average molecular weight of the monomers in the polymer?

A. 120 g/mol

Correct B. 150 g/mol

C. 200 g/mol

D. 250 g/mol

Correct Answer: B

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Question 22

A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the addition of 50 mL of HCl?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 23

A metal oxide, M2O3, has a molar mass of 200 g/mol. If the metal has an atomic mass of 50 g/mol, what is the percentage of the metal in the oxide?

A. 20%

B. 30%

Correct C. 40%

D. 50%

Correct Answer: C

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Question 24

A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?

Correct A. 0.5 L

B. 1 L

C. 2 L

D. 4 L

Correct Answer: A

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Question 25

A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the addition of 50 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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