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POST UTME CHRISTOPHER UNIVERSITY 2017 Chemistry | Objective

Are you preparing for POST UTME CHRISTOPHER UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Calculate the molar mass of a compound that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.

A. 12.0 g/mol

B. 24.0 g/mol

Correct C. 36.0 g/mol

D. 48.0 g/mol

Correct Answer: C

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Question 2

A 2.50 M solution of HCl is titrated with 1.00 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 3

A diagram of a titration setup is shown below. If 25.0 mL of 1.00 M NaOH is added to 50.0 mL of 2.50 M HCl, what is the pH of the solution?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 4

A 100.0 g sample of a polymer is dissolved in 500.0 mL of solvent. What is the concentration of the solution in g/L?

A. 0.20 g/L

B. 0.40 g/L

Correct C. 0.60 g/L

D. 0.80 g/L

Correct Answer: C

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Question 5

A diagram of a chromatography setup is shown below. If a sample of a mixture is separated into its components, what is the name of the process?

A. Distillation

B. Crystallization

Correct C. Chromatography

D. Filtration

Correct Answer: C

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Question 6

The rate cons\tant (k) for a first-order reaction is related to the half-life \( t_\( 1/2 \ \)) by the equation: k = ln(2) / t_\( 1/2 \). If the half-life of a reaction is 20 minutes, calculate the rate cons\tant (k) in min^\( -1 \).

Correct A. 0.0347 min^\( -1 \)

B. 0.0352 min^\( -1 \)

C. 0.0345 min^\( -1 \)

D. 0.0355 min^\( -1 \)

Correct Answer: A

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Question 7

A 2.50 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 1.00

B. 2.00

C. 3.00

Correct D. 4.00

Correct Answer: D

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Question 8

The s\tandard enthalpy of formation \( ΔH_f^∘ \) for CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation for C(s) + O2(g) → CO2(g)?

Correct A. -393.5 kJ/mol

B. -393.5 kJ/mol + 0 kJ/mol

C. -393.5 kJ/mol - 0 kJ/mol

D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol

Correct Answer: A

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Question 9

A 2.00 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 1.00

B. 2.00

C. 3.00

Correct D. 4.00

Correct Answer: D

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Question 10

The s\tandard enthalpy of formation \( ΔH_f^∘ \) for CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation for C(s) + O2(g) → CO2(g)?

Correct A. -393.5 kJ/mol

B. -393.5 kJ/mol + 0 kJ/mol

C. -393.5 kJ/mol - 0 kJ/mol

D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol

Correct Answer: A

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Question 11

Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) of AgCl is 1.8 × 10^\( -10 \) and the solubility product cons\tant (Ksp) of NaCl is 3.2 × 10^\( -9 \).

A. 1.0 × 10^\( -5 \) M

Correct B. 1.5 × 10^\( -5 \) M

C. 2.0 × 10^\( -5 \) M

D. 2.5 × 10^\( -5 \) M

Correct Answer: B

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Question 12

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CH4(g) from the following reaction: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l).

A. -74.8 kJ/mol

B. -74.9 kJ/mol

Correct C. -75.0 kJ/mol

D. -75.1 kJ/mol

Correct Answer: C

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Question 13

A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. 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 14

The atomic radius of a certain element is 100 pm. If the element has an atomic number of 20, what is its electron configuration?

A. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10

B. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8

C. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^9

Correct D. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6

Correct Answer: D

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Question 15

A 10 g sample of a metal is heated in a Bunsen burner flame. The metal is found to have a melting point of 800°C. What is the identity of the metal?

A. Aluminum

B. Copper

Correct C. Iron

D. Zinc

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.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 17

A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the number of moles of H2SO4.

A. 0.05

Correct B. 0.1

C. 0.15

D. 0.2

Correct Answer: B

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Question 18

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C(s).

A. -393.5

B. -393.5 + 298.2

C. -393.5 - 298.2

Correct D. -393.5 + 298.2 + 104.7

Correct Answer: D

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Question 19

A solution containing 0.1 M HCl and 0.1 M NaOH is titrated with 0.1 M H2SO4. Calculate the pH of the solution after 20 mL of H2SO4 has been added.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 20

The half-life of a radioactive subs\tance is 5 years. Calculate the activity of 1 gram of the subs\tance after 10 years.

A. 0.1

Correct B. 0.5

C. 1

D. 2

Correct Answer: B

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Question 21

The atomic radius of an element is 100 pm. If the element is in the 4th period, what is the value of the principal quantum number (n)?

A. 3

Correct B. 4

C. 5

D. 6

Correct Answer: B

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Question 22

A metal (M) reacts with chlorine gas to form a white solid. The reaction is represented by the equation: 2M + Cl2 → 2MCl. If 2.5 g of M is reacted with 1.5 g of Cl2, what is the limiting reac\tant?

Correct A. M

B. Cl2

C. Neither

D. Both

Correct Answer: A

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Question 23

A polymer is made up of repeating units of the following structure: CH2=CH—CH2—CH3. What is the type of polymerization reaction that occurred to form this polymer?

A. Condensation polymerization

Correct B. Addition polymerization

C. Ring-opening polymerization

D. Step-growth polymerization

Correct Answer: B

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Question 24

A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. What is the oxidation number of Mn in MnO4-?

Correct A. +7

B. +6

C. +5

D. +4

Correct Answer: A

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Question 25

A hydrocarbon has the molecular formula C4H10. What is the type of hydrocarbon?

Correct A. Alkane

B. Alkene

C. Alkyne

D. Aromatic hydrocarbon

Correct Answer: A

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