POST UTME MOUNTAIN TOP UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.500 M NaCl. What is the concentration of Cl^- ions in the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 2
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion of methane (CH4(g)) u\sing the following reaction: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l).
A. -890.3 kJ/mol
B. -890.8 kJ/mol
C. -891.3 kJ/mol
D. -892.8 kJ/mol
Question 3
A polymer that has a repeating unit of CH2=CH-CH3 is known as?
A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polybutadiene
Question 4
A 2.00 L sample of a gas at 27°C and 1.00 atm is compressed to 0.50 L at 37°C. Calculate the new pressure in atm.
A. 2.50 atm
B. 1.50 atm
C. 3.00 atm
D. 4.00 atm
Question 5
A 2.00 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 0.0313 atm, what is the partial pressure of the gas?
A. 0.968 atm
B. 0.974 atm
C. 0.980 atm
D. 0.986 atm
Question 6
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 7
The s\tandard entropy of formation of CO2(g) is 213.8 J/mol·K. Calculate the s\tandard entropy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. 160.2 J/mol·K
B. 160.5 J/mol·K
C. 161.0 J/mol·K
D. 161.5 J/mol·K
Question 8
A redox reaction involves the transfer of electrons from one species to another. What is the name of the species that loses electrons?
A. Oxidizing Agent
B. Reducing Agent
C. Electron Donor
D. Electron Acceptor
Question 9
The reaction 2NO(g) + O2(g) → 2NO2(g) has a s\tandard enthalpy change of -112 kJ/mol. What is the s\tandard enthalpy change for the reaction 2NO2(g) → 2NO(g) + O2(g)?
A. 112 kJ/mol
B. -112 kJ/mol
C. -224 kJ/mol
D. 224 kJ/mol
Question 10
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with excess oxygen gas according to the equation: 2H2 + O2 → 2H2O.
A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles
Question 11
A 2.00 g sample of a non-metallic element is found to have a density of 4.50 g/cm^3. Calculate the volume of the sample in cubic centimeters.
A. 0.444 cm^3
B. 0.444 L
C. 0.444 mL
D. 0.444 m^3
Question 12
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. What is the pH of the solution after 10 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 13
A solution contains 5.0 g of glu\cose (C6H12O6) per 100 mL. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 14
In the electrolysis of a solution of CuSO4, the anode is made of platinum and the cathode is made of copper. What is the expected product at the cathode?
A. Cu2+ ions
B. Cu metal
C. O2 gas
D. H2 gas
Question 15
A 25 mL sample of a solution containing 0.1 M NaCl is diluted to 100 mL. What is the new concentration of the solution?
A. 0.01 M
B. 0.1 M
C. 0.5 M
D. 1 M

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