POST UTME COAL CITY UNIVERSITY 2017 Chemistry | Objective

Are you preparing for POST UTME COAL CITY 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
In the electrolysis of molten sodium chloride, what is the primary product at the cathode?
Correct A. Sodium metal
B. Chlorine gas
C. Hydrogen gas
D. Sodium chloride

Correct Answer: A

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Question 2
What is the pH of a 0.1 M solution of hydrochloric acid?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 3
In the reaction 2NO(g) + O2(g) → 2NO2(g), what is the oxidation state of nitrogen in NO2?
A. +1
B. +2
Correct C. +3
D. +4

Correct Answer: C

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Question 4
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions?
A. 0.1 M
Correct B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: B

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Question 5
What is the molar mass of a compound that contains 40% carbon, 30% hydrogen, and 30% oxygen by mass?
A. 60 g/mol
B. 80 g/mol
Correct C. 100 g/mol
D. 120 g/mol

Correct Answer: C

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Question 6
During electrolysis of a solution of copper(II) sulfate, the anode is made of platinum. What is the most likely reaction occurring at the anode?
A. Oxidation of water to oxygen gas
B. Reduction of copper(II) ions to copper metal
Correct C. Oxidation of copper metal to copper(II) ions
D. Reduction of sulfate ions to hydrogen gas

Correct Answer: C

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Question 7
The following diagram shows a periodic table of elements. Which group of elements is characterized by the presence of unpaired electrons in their outermost energy level?
A. Group 1 (alkali metals)
B. Group 2 (alkaline earth metals)
C. Group 13 (boron group)
Correct D. Group 17 \( ha\logens \)

Correct Answer: D

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Question 8
A sample of nitrogen gas is collected over water at a temperature of 298 K and a pressure of 1.00 atm. What is the partial pressure of nitrogen gas in the sample?
Correct A. 0.95 atm
B. 0.99 atm
C. 1.00 atm
D. 1.03 atm

Correct Answer: A

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Question 9
The following diagram shows a titration setup. What is the purpose of the burette in this setup?
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
A metal M has a density of 8.00 g/cm^3 and a molar mass of 120 g/mol. What is the volume of 2.50 g of this metal?
A. 0.250 cm^3
Correct B. 0.500 cm^3
C. 1.00 cm^3
D. 2.00 cm^3

Correct Answer: B

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Question 11
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.25 M

Correct Answer: B

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Question 12
A metal M reacts with chlorine gas to form a white solid MX. The molar mass of M is 55 g/mol, and the molar mass of MX is 120 g/mol. What is the formula of MX?
A. MCl
Correct B. MCl2
C. MCl3
D. MCl4

Correct Answer: B

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Question 13
A 2.5 g sample of a metal M is heated in a crucible until it melts. The mass of the crucible and the metal is 3.2 g. What is the molar mass of M?
A. 40 g/mol
B. 50 g/mol
Correct C. 60 g/mol
D. 70 g/mol

Correct Answer: C

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Question 14
A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the concentration of H+ ions in the solution?
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 15
A metal M reacts with oxygen gas to form a white solid MO. The molar mass of M is 40 g/mol, and the molar mass of MO is 80 g/mol. What is the formula of MO?
Correct A. MO
B. M2O
C. M3O2
D. M2O3

Correct Answer: A

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Question 16
A 2.5 g sample of a metal M is heated in a crucible until it melts. The mass of the crucible and the metal is 3.2 g. What is the molar mass of M?
A. 40 g/mol
B. 50 g/mol
Correct C. 60 g/mol
D. 70 g/mol

Correct Answer: C

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Question 17
A 1.0 M solution of H2SO4 is prepared by dissolving 49 g of H2SO4 in 1000 mL of water. What is the concentration of H+ ions in the solution?
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 18
A metal M reacts with chlorine gas to form a white solid MX. The molar mass of M is 55 g/mol, and the molar mass of MX is 120 g/mol. What is the formula of MX?
A. MCl
Correct B. MCl2
C. MCl3
D. MCl4

Correct Answer: B

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Question 19
The reaction between nitrogen dioxide (NO2) and water (H2O) produces nitric acid (HNO3) and nitric oxide (NO). The balanced equation for this reaction is: 3NO2 + H2O → 2HNO3 + NO. If 2.5 moles of NO2 react with excess water, what is the limiting reac\tant?
Correct A. NO2
B. H2O
C. HNO3
D. NO

Correct Answer: A

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Question 20
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the term for the minimum amount of a subs\tance that must be present in a solution for it to be considered saturated?
A. Solubility
B. Saturated Solution
Correct C. Solubility Limit
D. Critical Concentration

Correct Answer: C

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Question 21
A 2.5 M solution of hydrochloric acid (HCl) is prepared by dissolving 2.5 moles of HCl in 1 liter of water. What is the concentration of the solution in terms of molarity?
A. 1 M
Correct B. 2.5 M
C. 5 M
D. 10 M

Correct Answer: B

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Question 22
A mixture of 10 g of sodium chloride (NaCl) and 20 g of glu\cose (C6H12O6) is dissolved in 100 g of water. What is the mass percentage of NaCl in the solution?
A. 10%
Correct B. 20%
C. 30%
D. 40%

Correct Answer: B

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Question 23
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 2.5 moles of NaOH in 1 liter of water. What is the concentration of the solution in terms of normality?
A. 1 N
Correct B. 2.5 N
C. 5 N
D. 10 N

Correct Answer: B

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Question 24
A mixture of 10 g of sodium chloride (NaCl) and 20 g of glu\cose (C6H12O6) is dissolved in 100 g of water. What is the mass percentage of glu\cose in the solution?
A. 10%
Correct B. 20%
C. 30%
D. 40%

Correct Answer: B

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Question 25
A 2.5 M solution of hydrochloric acid (HCl) is prepared by dissolving 2.5 moles of HCl in 1 liter of water. What is the concentration of the solution in terms of molarity?
A. 1 M
Correct B. 2.5 M
C. 5 M
D. 10 M

Correct Answer: B

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