POST UTME LEAD CITY UNIVERSITY 2018 Chemistry | Objective

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Question 1 View Details
In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?
A. Oxygen gas
B. Hydrogen gas
Correct C. Copper metal
D. Sulfuric acid

Correct Answer: C

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Question 2 View Details
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.01 × 10^5 Pa
Correct B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa

Correct Answer: B

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Question 3 View Details
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 4 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 measure the pH of the solution

Correct Answer: A

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Question 5 View Details
A 1.0 L flask contains 0.5 mol of an ideal gas at 50°C. What is the pressure of the gas?
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
Correct C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa

Correct Answer: C

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Question 6 View Details
A sample of nitrogen gas at 25°C and 1 atm is heated to 50°C. What is the new volume of the gas, assuming ideal behavior?
A. 1.5 L
Correct B. 2.0 L
C. 2.5 L
D. 3.0 L

Correct Answer: B

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Question 7 View Details
The reaction 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant of 0.05 s^-1 at 25°C. What is the rate of reaction when [NO] = 0.1 M and [O2] = 0.05 M?
A. 0.001 M s^-1
B. 0.005 M s^-1
Correct C. 0.01 M s^-1
D. 0.05 M s^-1

Correct Answer: C

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Question 8 View Details
A 2.0 M solution of sulfuric acid (H2SO4) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the concentration of the resulting solution?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 9 View Details
A sample of ethanol (C2H5OH) has a density of 0.79 g/mL. What is the mass of 250 mL of this solution?
A. 100 g
B. 150 g
Correct C. 200 g
D. 250 g

Correct Answer: C

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Question 10 View Details
A 1.0 M solution of sodium chloride (NaCl) is electrolyzed u\sing a current of 2.0 A. What is the mass of chlorine gas produced at the anode?
A. 0.1 g
B. 0.5 g
Correct C. 1.0 g
D. 2.0 g

Correct Answer: C

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Question 11 View Details
At 273.15 K, 1 mole of an ideal gas occupies a volume of 22.4 L. If the temperature is increased to 373.15 K, what is the new volume of the gas, assuming it remains ideal?
Correct A. 44.8 L
B. 22.4 L
C. 11.2 L
D. 5.6 L

Correct Answer: A

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Question 12 View Details
A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 2.0 g, what is the percentage yield of the reaction?
Correct A. 80%
B. 60%
C. 40%
D. 20%

Correct Answer: A

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Question 13 View Details
A solution of 2.0 g of sodium chloride in 100 g of water has a boiling point of 100.5°C. What is the molality of the solution?
Correct A. 0.10 m
B. 0.20 m
C. 0.30 m
D. 0.40 m

Correct Answer: A

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Question 14 View Details
A 1.0 L sample of a gas at 25°C and 1.0 atm is compressed to 2.0 L at the same temperature. What is the new pressure of the gas?
A. 2.0 atm
Correct B. 4.0 atm
C. 6.0 atm
D. 8.0 atm

Correct Answer: B

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Question 15 View Details
A 2.5 g sample of a metal hydroxide is treated with 20 mL of 1.0 M hydrochloric acid. If the reaction is 100% efficient, what is the mass of the metal chloride produced?
A. 2.5 g
Correct B. 5.0 g
C. 7.5 g
D. 10.0 g

Correct Answer: B

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Question 16 View Details
Determine the number of unpaired electrons in the ground state of a chromium atom, given that chromium has an atomic number of 24 and its electron configuration is [Ar] 3d5 4s1.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 17 View Details
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the pH of the solution after the addition of 25.0 mL of HCl.
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 18 View Details
A solution contains 0.500 M Na2CO3. What is the concentration of CO32- ions in the solution?
A. 0.250 M
Correct B. 0.500 M
C. 0.750 M
D. 1.00 M

Correct Answer: B

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Question 19 View Details
A 2.50 g sample of a subs\tance is dissolved in 25.0 mL of water. If the resulting solution has a concentration of 0.100 M, what is the molar mass of the subs\tance?
A. 20.0 g/mol
B. 40.0 g/mol
Correct C. 60.0 g/mol
D. 80.0 g/mol

Correct Answer: C

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Question 20 View Details
A 10.0 mL sample of a solution containing 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 20.0 mL of NaOH?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 21 View Details
Determine the number of moles of nitrogen gas (N2) that will react with 2.5 moles of hydrogen gas (H2) according to the equation: N2 + 3H2 → 2NH3.
A. 1.25 moles
B. 2.5 moles
Correct C. 3.75 moles
D. 5 moles

Correct Answer: C

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Question 22 View Details
A sample of oxygen gas (O2) occupies a volume of 2.5 liters at a pressure of 1 atm and a temperature of 25°C. What is the number of moles of oxygen gas present?
A. 0.1 moles
B. 0.2 moles
Correct C. 0.5 moles
D. 1 mole

Correct Answer: C

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Question 23 View Details
A solution of sulfuric acid (H2SO4) has a pH of 1.8. What is the concentration of hydrogen ions \( H+ \) in the solution?
A. 0.01 M
B. 0.1 M
Correct C. 1 M
D. 10 M

Correct Answer: C

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Question 24 View Details
A sample of sodium chloride (NaCl) is dissolved in water to form a saturated solution. What is the concentration of sodium ions \( Na+ \) in the solution?
A. 0.1 M
B. 0.5 M
Correct C. 1 M
D. 5 M

Correct Answer: C

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Question 25 View Details
A gas mixture contains 2 moles of nitrogen gas (N2) and 3 moles of oxygen gas (O2). What is the total number of moles of gas in the mixture?
A. 2 moles
B. 3 moles
C. 4 moles
Correct D. 5 moles

Correct Answer: D

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