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POST UTME GREENFIELD UNIVERSITY 2018 Chemistry | Objective

Are you preparing for POST UTME GREENFIELD 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

The enthalpy change (ΔH) for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s) is -853.4 kJ/mol. Calculate the s\tandard enthalpy of formation (ΔHf) of Al2O3(s) in kJ/mol.

A. -853.4 kJ/mol

B. -853.4 kJ/mol + 2 ΔHf(Al2O3(s))

Correct C. -853.4 kJ/mol - 2 ΔHf(Al2O3(s))

D. -853.4 kJ/mol + ΔHf(Al2O3(s))

Correct Answer: C

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Question 2

A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. If the reaction is allowed to go to completion, what is the concentration of the resulting solution?

A. 0.500 M

B. 1.00 M

Correct C. 0.250 M

D. 0.125 M

Correct Answer: C

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Question 3

The diagram below shows a titration setup. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

A. 0.100 M

Correct B. 0.0500 M

C. 0.200 M

D. 0.0500 M

Correct Answer: B

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Question 4

A sample of a non-metallic element has a mass of 2.50 g and a volume of 5.00 mL. What is the density of the element?

A. 1.00 g/mL

Correct B. 2.50 g/mL

C. 5.00 g/mL

D. 10.0 g/mL

Correct Answer: B

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Question 5

The s\tandard enthalpy of formation (ΔHf) of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion (ΔHc) of CH4(g)?

Correct A. -890.3 kJ/mol

B. -393.5 kJ/mol

C. -393.5 kJ/mol + 2 ΔHf(CO2(g))

D. -393.5 kJ/mol - 2 ΔHf(CO2(g))

Correct Answer: A

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Question 6

Determine the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 7

A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 8

A polymer has a molecular weight of 100,000 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 9

A 2.00 g sample of an unknown hydrocarbon is burned in a bomb calorimeter. The heat of combustion is 12.5 kJ/g. What is the molar mass of the hydrocarbon?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 10

A 1.00 L sample of a gas at 25°C and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. What is the new volume of the gas?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 11

Determine the s\tandard enthalpy of formation of $\text{CaCO}_3(s)$ from the following data: $\Delta H^\circ_{f}$ \text{CaO}\( s \ $) = -635.09 \text{ kJ/mol}$, $\Delta H^\circ_{f}$ \text{CO}_2\( g \ $) = -393.51 \text{ kJ/mol}$, and $\Delta H^\circ_{f}$ \text{CaCO}_3\( s \ $) = -1206.92 \text{ kJ/mol}$.

Correct A. -1785.69 kJ/mol

B. -1785.69 kJ/mol

C. -1785.69 kJ/mol

D. -1785.69 kJ/mol

Correct Answer: A

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Question 12

A diagram of a titration setup is shown below. If 25.00 mL of 0.1000 M $\text{HCl}$ is required to reach the equivalence point, what is the concentration of the $\text{NaOH}$ solution?

Correct A. 0.1000 M

B. 0.1000 M

C. 0.1000 M

D. 0.1000 M

Correct Answer: A

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Question 13

The s\tandard enthalpy of formation of $\text{H}_2(g)$ is $\Delta H^\circ_{f}$ \text{H}_2\( g \ $) = 0 \text{ kJ/mol}$. What is the s\tandard enthalpy of combustion of $\text{H}_2(g)$?

Correct A. -286.0 kJ/mol

B. -286.0 kJ/mol

C. -286.0 kJ/mol

D. -286.0 kJ/mol

Correct Answer: A

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Question 14

A diagram of a simple harmonic motion is shown below. If the amplitude of the motion is 5.00 cm and the period is 2.00 s, what is the angular frequency?

Correct A. 1.00 rad/s

B. 1.00 rad/s

C. 1.00 rad/s

D. 1.00 rad/s

Correct Answer: A

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Question 15

The s\tandard enthalpy of formation of $\text{CO}_2(g)$ is $\Delta H^\circ_{f}$ \text{CO}_2\( g \ $) = -393.51 \text{ kJ/mol}$. What is the s\tandard enthalpy of combustion of $\text{CH}_4(g)$?

Correct A. -890.3 kJ/mol

B. -890.3 kJ/mol

C. -890.3 kJ/mol

D. -890.3 kJ/mol

Correct Answer: A

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Question 16

Calculate the s\tandard enthalpy change $ ΔH^circ $ for the reaction: 2Al(s) + Fe_2O_3(s) → 2Fe(s) + Al_2O_3(s). The s\tandard enthalpy of formation $ ΔH^circ_f $ values are: ΔH^circ_f$ Al_2O_3\( s \ $) = -1675.7 kJ/mol, ΔH^circ_f(Al(s)) = 0 kJ/mol, ΔH^circ_f$ Fe_2O_3\( s \ $) = -826.4 kJ/mol, ΔH^circ_f(Fe(s)) = 0 kJ/mol.

Correct A. -1451.1 kJ/mol

B. -1451.5 kJ/mol

C. -1451.9 kJ/mol

D. -1452.3 kJ/mol

Correct Answer: A

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Question 17

A 2.50 L flask contains 0.250 mol of an ideal gas at 25.0°C. Calculate the pressure (in atm) of the gas u\sing the ideal gas law.

A. 1.01 atm

Correct B. 1.02 atm

C. 1.03 atm

D. 1.04 atm

Correct Answer: B

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Question 18

A solution contains 2.50 g of NaCl. If 25.0 mL of water is added to the solution, what is the molarity of the resulting solution?

A. 0.100 M

Correct B. 0.200 M

C. 0.300 M

D. 0.400 M

Correct Answer: B

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Question 19

A 0.500 L flask contains 0.250 mol of CO_2 gas at 25.0°C. If 0.250 mol of O_2 gas is added to the flask, what is the total pressure (in atm) of the gas mixture?

A. 1.01 atm

B. 1.02 atm

Correct C. 1.03 atm

D. 1.04 atm

Correct Answer: C

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Question 20

A 2.50 L flask contains 0.250 mol of an ideal gas at 25.0°C. If the gas is compressed to 1.00 L, what is the new pressure (in atm) of the gas?

A. 2.01 atm

Correct B. 2.02 atm

C. 2.03 atm

D. 2.04 atm

Correct Answer: B

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