POST UTME COAL CITY UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of an unknown compound has a molecular formula of C6H12O6. What is the most likely type of bond present in this compound?
A. Single bond
B. Double bond
C. Triple bond
D. Hydrogen bond
Question 2
The atomic number of an element is equal to the number of _______ in its atomic nucleus.
A. protons
B. neutrons
C. electrons
D. photons
Question 3
A polymer has a repeating unit of the following structure: CH2=CH-COOH. What type of polymer is this?
A. Polyester
B. Polyamide
C. Polyacrylate
D. Polycarbonate
Question 4
The reaction between chlorine gas and sodium hydroxide solution produces a compound that is a strong base. What is the chemical formula of this compound?
A. NaClO
B. NaCl
C. NaOH
D. NaClO3
Question 5
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after the reaction is complete?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 6
A periodic table shows that the atomic number of an element is 20. What is the element?
A. Ca
B. Mg
C. Na
D. K
Question 7
What is the difference between a primary and secondary bond in a polymer?
A. Primary bonds are stronger than secondary bonds
B. Primary bonds are weaker than secondary bonds
C. Primary bonds are covalent, while secondary bonds are ionic
D. Primary bonds are ionic, while secondary bonds are covalent
Question 8
What is the relationship between entropy and the second law of thermodynamics?
A. Entropy increases with temperature
B. Entropy decreases with temperature
C. Entropy is cons\tant at equilibrium
D. Entropy is a measure of disorder
Question 9
A metal (M) reacts with chlorine gas (Cl2) to form a metal chloride (MCl2). If the reaction is: 2M + Cl2 → 2MCl, what is the oxidation state of the metal (M) in the product?
A. +1
B. +2
C. +3
D. +4
Question 10
A mixture of 0.5 mol of CO2 and 0.3 mol of H2O is heated to 373 K. Calculate the total number of moles of gas present in the mixture.
A. 0.8 mol
B. 1.2 mol
C. 1.5 mol
D. 2.0 mol
Question 11
A 2.00-g sample of a hydrocarbon is burned in a combustion calorimeter. The reaction is carried out in a bomb calorimeter, and the heat of combustion is found to be - 35.5 kJ/g. If the unknown hydrocarbon has a molar mass of 84.2 g/mol, what is its empirical formula?
A. C6H14
B. C4H10
C. C5H12
D. C3H8
Question 12
A 2.00-g sample of a polymer is dissolved in 100.0 mL of solvent. The solution is then titrated with 0.500 M NaOH, and 25.0 mL of NaOH is required to reach the equivalence point. What is the molar mass of the polymer?
A. 500
B. 1000
C. 2000
D. 5000
Question 13
A solution contains 0.1 M NaCl. If 10 mL of this solution is diluted to 100 mL, what is the new concentration of NaCl?
A. 0.01 M
B. 0.1 M
C. 1.0 M
D. 10 M
Question 14
A metal (M) reacts with chlorine gas (Cl2) to form a metal chloride (MCl2). If the reaction is: 2M + Cl2 → 2MCl, what is the oxidation state of the metal (M) in the product?
A. +1
B. +2
C. +3
D. +4
Question 15
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To slow down the reaction

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