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POST UTME PAN-ATLANTIC UNIVERSITY 2017 Chemistry | Objective

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Question 1 View Details

A solution of $CuSO_4$ is electrolyzed u\sing a platinum electrode. The anode reaction is:

Correct A. Cu + SO_4^{2-}

B. Cu^2+ + SO_4^{2-}

C. Cu + 2H^+

D. Cu + 2OH^-

Correct Answer: A

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Question 2 View Details

A 0.1 M solution of $NaCl$ is prepared by dissolving 6.0 g of $NaCl$ in 1 L of water. What is the concentration of $Na^+$ ions in the solution?

Correct A. 0.1 M

B. 0.05 M

C. 0.2 M

D. 0.05 M

Correct Answer: A

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Question 3 View Details

A 2.0 M solution of $H_2SO_4$ is prepared by dissolving 40 g of $H_2SO_4$ in 1 L of water. What is the concentration of $H^+$ ions in the solution?

Correct A. 2.0 M

B. 1.0 M

C. 4.0 M

D. 0.5 M

Correct Answer: A

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Question 4 View Details

A solution of $CuSO_4$ is electrolyzed u\sing a platinum electrode. The cathode reaction is:

A. Cu + SO_4^{2-}

B. Cu^2+ + SO_4^{2-}

C. Cu + 2H^+

Correct D. Cu + 2OH^-

Correct Answer: D

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Question 5 View Details

A 0.1 M solution of $NaCl$ is prepared by dissolving 6.0 g of $NaCl$ in 1 L of water. What is the concentration of $Cl^-$ ions in the solution?

Correct A. 0.1 M

B. 0.05 M

C. 0.2 M

D. 0.05 M

Correct Answer: A

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Question 6 View Details

A sample of an ideal gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C at cons\tant pressure, what is the new volume of the gas?

A. 3.125 L

Correct B. 4.166 L

C. 5.208 L

D. 6.25 L

Correct Answer: B

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Question 7 View Details

The reaction 2A + B → 3C is a redox reaction. If 2 moles of A and 1 mole of B are mixed, what is the limiting reac\tant?

Correct A. A

B. B

C. Neither A nor B is the limiting reac\tant

D. The reaction is not a redox reaction

Correct Answer: A

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Question 8 View Details

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?

A. 1

B. 2

Correct C. 7

D. 14

Correct Answer: C

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Question 9 View Details

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To separate the titrant and analyte

Correct Answer: A

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Question 10 View Details

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. What is the purpose of the pipette?

A. To measure the volume of the titrant

Correct B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To separate the titrant and analyte

Correct Answer: B

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Question 11 View Details

A 25.0 g sample of a metal oxide is heated in a crucible until it decomposes completely. The mass of the metal obtained is 16.0 g. If the metal oxide has a molar mass of 120.0 g/mol, what is the empirical formula of the metal oxide?

A. MgO

B. CaO

Correct C. Fe2O3

D. CuO

Correct Answer: C

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Question 12 View Details

A 2.50 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?

A. 50.0 mL

Correct B. 75.0 mL

C. 100 mL

D. 125 mL

Correct Answer: B

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Question 13 View Details

A 1.00 g sample of a non-metallic element is burned in a stream of oxygen gas. The mass of the resulting oxide is 1.50 g. If the molar mass of the oxide is 80.0 g/mol, what is the empirical formula of the non-metallic element?

Correct A. S

B. P

C. Cl

D. Br

Correct Answer: A

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Question 14 View Details

A 2.00 M solution of CH3OH is titrated with a 1.00 M solution of HCl. If 25.0 mL of HCl is required to reach the equivalence point, what is the volume of CH3OH required to reach the equivalence point?

A. 50.0 mL

Correct B. 75.0 mL

C. 100 mL

D. 125 mL

Correct Answer: B

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Question 15 View Details

A 1.00 g sample of a metal is heated in a crucible until it decomposes completely. The mass of the resulting oxide is 1.50 g. If the molar mass of the metal is 40.0 g/mol, what is the empirical formula of the metal oxide?

Correct A. MgO

B. CaO

C. Fe2O3

D. CuO

Correct Answer: A

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Question 16 View Details

Determine the number of moles of H2 gas produced when 2.5 liters of H2 at 27°C and 1.2 atm is collected over water at 25°C and 1 atm.

A. 0.25 mol

Correct B. 0.5 mol

C. 0.75 mol

D. 1 mol

Correct Answer: B

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Question 17 View Details

Identify the type of isomerism exhibited by the compound CH3CH=CHCH3.

A. Geometrical isomerism

B. Optical isomerism

Correct C. Structural isomerism

D. Conformational isomerism

Correct Answer: C

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Question 18 View Details

A sample of CO2 at 25°C and 1 atm is collected over water at 25°C and 1 atm. Calculate the partial pressure of CO2.

A. 0.5 atm

B. 0.75 atm

Correct C. 1 atm

D. 1.25 atm

Correct Answer: C

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Question 19 View Details

A solution of HCl is prepared by dissolving 25 g of HCl in 100 mL of water. Calculate the molarity of the solution.

A. 0.1 M

B. 0.5 M

Correct C. 1 M

D. 2 M

Correct Answer: C

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Question 20 View Details

A sample of O2 at 25°C and 1 atm is collected over water at 25°C and 1 atm. Calculate the volume of O2 collected.

A. 2 L

Correct B. 5 L

C. 10 L

D. 20 L

Correct Answer: B

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Question 21 View Details

Determine the pH of a 0.1 M solution of HCl.

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 22 View Details

A 25 mL sample of 0.5 M H2SO4 is mixed with 25 mL of 0.5 M NaOH. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 23 View Details

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

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 24 View Details

A 100 mL sample of 0.1 M HCl is mixed with 100 mL of 0.1 M NaOH. Calculate the pH of the resulting solution.

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 25 View Details

A 50 mL sample of 0.2 M HCl is mixed with 50 mL of 0.2 M NaOH. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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