POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME JOSEPH AYO BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
The electronegativity of an element in a period increases as you move from left to right. What is the reason for this tr\end?
A. The atomic radius decreases as you move from left to right in a period.
B. The number of electrons in the outermost energy level increases as you move from left to right in a period.
Correct C. The effective nuclear charge increases as you move from left to right in a period.
D. The ionization energy increases as you move from left to right in a period.

Correct Answer: C

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Question 2
A polymer is a large molecule composed of many smaller molecules called monomers. What is the name of the process by which a polymer is formed from monomers?
Correct A. Polymerization
B. Depolymerization
C. Crystallization
D. Amorphization

Correct Answer: A

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Question 3
A 2.0 g sample of a subs\tance is placed in a 100 mL beaker and heated to 100°C. The mass of the subs\tance is measured to be 2.5 g. What is the change in enthalpy (ΔH) for the subs\tance?
A. 10 kJ/mol
Correct B. 20 kJ/mol
C. 30 kJ/mol
D. 40 kJ/mol

Correct Answer: B

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Question 4
A metal is an element that is typically hard, shiny, and a good conductor of electricity. What is the name of the process by which a metal is extracted from its ore?
Correct A. Smelting
B. Refining
C. Electrolysis
D. Crystallization

Correct Answer: A

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Question 5
A solution is a homogeneous mixture of two or more subs\tances. What is the name of the process by which a solution is formed?
Correct A. Dissolution
B. Crystallization
C. Amorphization
D. Polymerization

Correct Answer: A

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Question 6
Determine the molar mass of a polymer with the following repeating unit: CH2CH(CH3)CH2OCH3. Given that the molar mass of the repeating unit is 74.12 g/mol, calculate the molar mass of the polymer.
A. 74.12 g/mol
Correct B. 148.24 g/mol
C. 222.36 g/mol
D. 296.48 g/mol

Correct Answer: B

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Question 7
A 2.5 L sample of a 0.5 M solution of NaCl is electrolyzed u\sing a current of 2.5 A for 3 hours. Calculate the mass of Cl2 gas produced.
A. 0.25 g
B. 0.5 g
Correct C. 1.0 g
D. 1.5 g

Correct Answer: C

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Question 8
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. Calculate the pH of the resulting solution.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 9
A sample of 2.0 g of a polymer with the following repeating unit: CH2CH(CH3)CH2OCH3 is dissolved in 100 mL of water. Calculate the concentration of the solution in g/L.
A. 0.02 g/L
B. 0.04 g/L
Correct C. 0.06 g/L
D. 0.08 g/L

Correct Answer: C

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Question 10
A 1.0 L sample of a 0.5 M solution of NaCl is electrolyzed u\sing a current of 2.5 A for 2 hours. Calculate the mass of Cl2 gas produced.
A. 0.25 g
B. 0.5 g
Correct C. 1.0 g
D. 1.5 g

Correct Answer: C

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Question 11
Determine the molar mass of a polymer with the repeating unit CH2CH2OCH2CH2O.
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 12
A sample of a periodic table element has a mass of 2.5 g and a volume of 5.0 mL. Calculate the density of the element.
A. 0.5 g/mL
Correct B. 1.0 g/mL
C. 2.0 g/mL
D. 5.0 g/mL

Correct Answer: B

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Question 13
A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. Calculate 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 14
A 100.0 g sample of glu\cose (C6H12O6) is burned in a bomb calorimeter. If the heat released is 5.0 kJ/g, calculate the total heat released.
A. 500 kJ
B. 1000 kJ
C. 2000 kJ
Correct D. 5000 kJ

Correct Answer: D

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Question 15
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. Calculate the number of moles of H2O produced.
A. 0.5 mol
Correct B. 1.0 mol
C. 2.0 mol
D. 3.0 mol

Correct Answer: B

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Question 16
Determine the molar mass of a compound composed of 75.0% carbon and 25.0% nitrogen by mass, assuming the molar mass of carbon is 12.01 g/mol and the molar mass of nitrogen is 14.01 g/mol.
A. 120.0 g/mol
Correct B. 140.0 g/mol
C. 160.0 g/mol
D. 180.0 g/mol

Correct Answer: B

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Question 17
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 mmHg, calculate the partial pressure of the gas.
A. 0.97 atm
B. 1.00 atm
Correct C. 1.03 atm
D. 1.05 atm

Correct Answer: C

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Question 18
A 10.0 mL sample of a 0.100 M solution of NaOH is mixed with 20.0 mL of a 0.0500 M solution of HCl. What is the resulting pH?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 19
A 25.0 mL sample of a 0.500 M solution of H2SO4 is mixed with 50.0 mL of a 0.100 M solution of NaOH. What is the resulting pH?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 20
A 50.0 mL sample of a 0.100 M solution of HCl is mixed with 100.0 mL of a 0.0500 M solution of NaOH. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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