POST UTME COVENANT UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is CaO(s) + CO2(g) → CaCO3(s).
A. -1782.6 kJ/mol
B. -1782.6 kJ/mol
C. -1782.6 kJ/mol
D. -1782.6 kJ/mol
Question 2
A metal M has a s\tandard electrode potential of +0.5 V. If a cell is constructed u\sing M|M2+ as the anode and Zn|Zn2+ as the cathode, what is the s\tandard cell potential?
A. +0.5
B. +1.0
C. +1.5
D. +2.0
Question 3
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 1
B. 2
C. 3
D. 4
Question 4
A polymer is formed by the condensation reaction between two monomers, A and B. If the molecular weight of the polymer is 100,000 g/mol, and the molecular weights of the monomers are 50,000 g/mol and 30,000 g/mol, respectively, what is the degree of polymerization?
A. 2
B. 3
C. 4
D. 5
Question 5
A polymer is a long chain of repeating units called monomers. What is the name of the process by which monomers are linked together to form a polymer?
A. Polymerization
B. Depolymerization
C. Crystallization
D. Amorphization
Question 6
A sample of a gas has a volume of 2.50 L at a temperature of 298 K and a pressure of 1.00 atm. What is the new volume of the gas if the temperature is increased to 323 K and the pressure is decreased to 0.750 atm?
A. 3.20 L
B. 3.50 L
C. 3.80 L
D. 4.00 L
Question 7
The rate of a chemical reaction is affected by the concentration of the reac\tants. What is the name of the law that describes this relationship?
A. First Law of Thermodynamics
B. Second Law of Thermodynamics
C. Zeroth Law of Thermodynamics
D. Law of Mass Action
Question 8
A solution contains 2.5 g of sodium chloride (NaCl) per 100 mL of water. What is the molarity of the solution?
A. 0.25 M
B. 0.50 M
C. 1.0 M
D. 2.0 M
Question 9
Determine the hybridization of the carbon atom in the molecule CH3Cl, given that the bond angles are 109.5° and the C-Cl bond length is 1.75 Å.
A. sp3
B. sp2
C. sp
D. dsp3
Question 10
A diagram of a plant cell is shown below. What is the function of the cell wall?
A. To provide structural support
B. To regulate the movement of subs\tances
C. To produce energy
D. To synthesize proteins
Question 11
A 0.500 M solution of HCl is mixed with a 0.750 M solution of NaOH. If the reaction is complete, what is the concentration of the resulting solution?
A. 0.625 M
B. 0.750 M
C. 0.875 M
D. 1.000 M
Question 12
A sample of nitrogen gas occupies a volume of 2.5 liters at a pressure of 1.5 atm. What is the volume of the gas at a pressure of 3.0 atm, assuming the temperature remains cons\tant?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 13
Determine the number of electrons in a neutral atom of an element with atomic number 12.
A. 12
B. 24
C. 36
D. 48
Question 14
A redox reaction involves the transfer of electrons from one subs\tance to another. What is the name of the subs\tance that loses electrons?
A. Oxidizing Agent
B. Reducing Agent
C. Electron Donor
D. Electron Acceptor
Question 15
A 2.50 L flask contains 0.250 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 1.01 × 10^5 Pa
C. 1.01 × 10^5 Pa
D. 1.01 × 10^5 Pa

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: