POST UTME ESUT 2017 Chemistry | Objective

Are you preparing for POST UTME ESUT 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.

Practice these randomly selected questions to test your readiness.

Question 1
In the electrolysis of water, what is the primary product at the cathode?
Correct A. Hydrogen gas
B. Oxygen gas
C. Water
D. Hydrogen peroxide

Correct Answer: A

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Question 2
What is the major difference between a true solution and a colloidal solution?
Correct A. Particle size
B. Intermolecular forces
C. Solubility
D. Vis\cosity

Correct Answer: A

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Question 3
What is the major product of the reaction between 2-methylpropane and chlorine?
A. 2-Chloro-2-methylpropane
Correct B. 2,2-Dichloro-2-methylpropane
C. 2-Chloro-2-methyl-1-propane
D. 2-Chloro-2-methyl-2-propane

Correct Answer: B

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Question 4
What is the major difference between a primary and a secondary alkyl halide?
A. Primary alkyl halides have a tertiary carbon atom
B. Secondary alkyl halides have a secondary carbon atom
Correct C. Primary alkyl halides have a primary carbon atom
D. Secondary alkyl halides have a primary carbon atom

Correct Answer: C

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Question 5
What is the major product of the reaction between ethene and hydrogen in the presence of a palladium catalyst?
Correct A. Ethane
B. Ethanol
C. Propane
D. Bu\tane

Correct Answer: A

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Question 6
A mixture of 2.0 g of an unknown metal oxide and 10.0 g of CO in a 100 mL flask is heated to 1000 K. If the reaction is 100% efficient, what is the maximum mass of the metal that can be produced?
A. 2.5 g
B. 5.0 g
Correct C. 10.0 g
D. 15.0 g

Correct Answer: C

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Question 7
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?
A. 1
B. 2
Correct C. 7
D. 14

Correct Answer: C

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Question 8
A sample of a metal (M) reacts with oxygen to form a metal oxide (MO). The reaction is as follows: 4M + 3O2 → 2MO. If 2.0 g of M reacts with 3.0 g of O2, what is the mass of MO produced?
A. 2.5 g
B. 5.0 g
Correct C. 7.5 g
D. 10.0 g

Correct Answer: C

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Question 9
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 10
A sample of a metal (M) reacts with oxygen to form a metal oxide (MO). The reaction is as follows: 4M + 3O2 → 2MO. If 2.0 g of M reacts with 3.0 g of O2, what is the mass of M that can be produced from 10.0 g of O2?
A. 2.5 g
B. 5.0 g
Correct C. 7.5 g
D. 10.0 g

Correct Answer: C

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Question 11
Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 0.050 mol
Correct B. 0.100 mol
C. 0.150 mol
D. 0.200 mol

Correct Answer: B

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Question 12
A 2.5 M solution of HCl is mixed with a 2.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 13
The half-life of a radioactive subs\tance is 5.0 years. If 100 g of the subs\tance initially exists, how much will remain after 10 years?
A. 25 g
B. 50 g
Correct C. 75 g
D. 100 g

Correct Answer: C

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Question 14
A sample of hydrogen gas (H2) occupies a volume of 2.5 L at a pressure of 1.0 atm. What is the volume of the gas at a pressure of 2.0 atm, assuming the temperature remains cons\tant?
A. 1.0 L
Correct B. 1.5 L
C. 2.0 L
D. 2.5 L

Correct Answer: B

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Question 15
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the resulting pH?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 16
The rate cons\tant (k) of a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 300 K, calculate the value of k if A = 2.5 x 10^10 s^-1.
A. 1.5 x 10^6 s^-1
Correct B. 2.5 x 10^6 s^-1
C. 3.5 x 10^6 s^-1
D. 4.5 x 10^6 s^-1

Correct Answer: B

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Question 17
A solution contains 0.1 M NaCl. If 10 mL of this solution is diluted to 100 mL, what is the concentration of the resulting solution?
A. 0.01 M
Correct B. 0.05 M
C. 0.1 M
D. 0.2 M

Correct Answer: B

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Question 18
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.1 g/L
Correct B. 1 g/L
C. 10 g/L
D. 100 g/L

Correct Answer: B

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Question 19
A solution contains 0.5 M HCl. If 20 mL of this solution is titrated with 0.1 M NaOH, what is the pH of the resulting solution?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 20
A solution contains 0.2 M NaOH. If 10 mL of this solution is diluted to 100 mL, what is the concentration of the resulting solution?
A. 0.002 M
Correct B. 0.01 M
C. 0.02 M
D. 0.05 M

Correct Answer: B

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