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POST UTME BELLS UNIVERSITY 2020 Chemistry | Objective

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Question 1 View Details

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 2 View Details

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

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 3 View Details

A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: 2X + Cl2 → 2XCl. If 2.5 g of X reacts with 1.5 g of Cl2, what is the percentage yield of XCl?

A. 80%

B. 90%

Correct C. 95%

D. 98%

Correct Answer: C

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Question 4 View Details

A diagram of a simple electric circuit is shown below. If the current through the circuit is 2 A and the resis\tance is 10 Ω, what is the voltage across the circuit?

A. 20 V

B. 30 V

Correct C. 40 V

D. 50 V

Correct Answer: C

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Question 5 View Details

A diagram of a simple plant cell is shown below. Identify the part labeled A.

A. Chloroplast

B. Mitochondria

Correct C. Nucleus

D. Vacuole

Correct Answer: C

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Question 6 View Details

The reaction between zinc metal and copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 2.50 g of zinc metal is added to 100 cm3 of 0.0500 M copper(II) sulfate solution, what is the maximum mass of copper metal that can be deposited?

Correct A. 1.25 g

B. 2.50 g

C. 3.75 g

D. 5.00 g

Correct Answer: A

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Question 7 View Details

A 2.00 M solution of hydrochloric acid (HCl) is mixed with a 1.00 M solution of sodium hydroxide (NaOH). If 50.0 cm3 of the HCl solution is added to 50.0 cm3 of the NaOH solution, what is the concentration of the resulting solution?

A. 0.500 M

Correct B. 1.00 M

C. 1.50 M

D. 2.00 M

Correct Answer: B

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Question 8 View Details

The s\tandard enthalpy change of formation of carbon dioxide (CO2) is -393.5 kJ/mol. If 2.50 mol of CO2 is produced at 25°C, what is the total enthalpy change for the reaction?

Correct A. -987.5 kJ

B. -1,225 kJ

C. -1,563 kJ

D. -1,875 kJ

Correct Answer: A

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Question 9 View Details

A sample of hydrogen gas (H2) is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 0.020 atm, what is the total pressure of the gas mixture?

A. 0.980 atm

B. 0.990 atm

Correct C. 1.00 atm

D. 1.010 atm

Correct Answer: C

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Question 10 View Details

The atomic radius of a certain element is 100 pm. If the element has an electron configuration of [Ar] 4s2 3d5, what is the expected oxidation state of the element?

A. +2

Correct B. +3

C. +5

D. +7

Correct Answer: B

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Question 11 View Details

Determine the pH of a 0.1 M solution of HCl at 25°C.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 12 View Details

A solution contains 0.5 M NaOH and 0.2 M HCl. What is the concentration of the common ion after the reaction is complete?

A. 0.3 M

B. 0.4 M

C. 0.5 M

Correct D. 0.6 M

Correct Answer: D

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Question 13 View Details

The rate cons\tant for a first-order reaction is 0.05 min^-1. What is 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 14 View Details

A 2.0 M solution of H2SO4 is titrated with 1.0 M NaOH. What is the pH of the solution after the reaction is complete?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 15 View Details

A 0.5 M solution of HCl is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 16 View Details

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.

Correct A. -1206.60 kJ/mol

B. -1206.61 kJ/mol

C. -1206.59 kJ/mol

D. -1206.62 kJ/mol

Correct Answer: A

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Question 17 View Details

A 2.5 L flask contains 0.50 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 x 10^2 kPa

Correct B. 1.01 x 10^3 kPa

C. 1.01 x 10^4 kPa

D. 1.01 x 10^5 kPa

Correct Answer: B

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Question 18 View Details

The solubility of a slightly soluble salt, AgCl(s), in water at 298 K is 1.2 x 10^-5 mol/L. Calculate the molar solubility of AgCl(s) in a 0.10 M NaCl solution.

A. 1.2 x 10^-5 mol/L

Correct B. 1.2 x 10^-4 mol/L

C. 1.2 x 10^-3 mol/L

D. 1.2 x 10^-2 mol/L

Correct Answer: B

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Question 19 View Details

A 100 mL sample of a solution containing 0.50 M NaCl is titrated with 0.10 M AgNO3. Calculate the volume of AgNO3 required to reach the equivalence point.

A. 50 mL

B. 100 mL

Correct C. 150 mL

D. 200 mL

Correct Answer: C

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Question 20 View Details

A 2.0 L flask contains 0.50 mol of an ideal gas at 298 K. Calculate the root mean square speed of the gas molecules.

A. 1.4 x 10^2 m/s

Correct B. 1.4 x 10^3 m/s

C. 1.4 x 10^4 m/s

D. 1.4 x 10^5 m/s

Correct Answer: B

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