POST UTME CHRISTOPHER UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a cell is shown below. What is the purpose of the salt bridge?
A. To prevent the mixing of the two solutions
B. To allow the flow of electrons
C. To maintain electrical neutrality
D. To increase the voltage of the cell
Question 2
A 2.0 g sample of a polymer, P, is dissolved in 100 mL of a solvent. If the concentration of the solution is 0.1 g/mL, what is the molecular weight of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 3
A 2.0 M solution of HCl is titrated with 0.5 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl in liters?
A. 0.125 L
B. 0.25 L
C. 0.5 L
D. 1.0 L
Question 4
A 2.0 L flask contains 0.5 mol of N2 gas at 25°C. What is the pressure of the gas in the flask?
A. 101.3 kPa
B. 202.6 kPa
C. 303.9 kPa
D. 404.2 kPa
Question 5
A 0.1 M solution of a weak base, B, is prepared by dissolving 0.1 g of B in 100 mL of water. If the density of the solution is 1.0 g/mL, what is the pOH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 6
A 1.0 M solution of sodium hydroxide (NaOH) is prepared by dissolving 40.0 g of NaOH in water to make 1.0 L of solution. What is the concentration of the solution in terms of molarity?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 7
A sample of benzene (C6H6) is burned in a combustion reaction. If 2.5 g of CO2 is produced, what is the mass of benzene that was burned?
A. 10.5 g
B. 12.5 g
C. 15.0 g
D. 17.5 g
Question 8
A solution contains 5.0 g of NaCl. If 20.0 mL of 0.1 M AgNO3 is added to the solution, what is the limiting reac\tant?
A. NaCl
B. AgNO3
C. Neither
D. Both
Question 9
A 0.1 M solution of a weak acid, HA, is prepared by dissolving 0.1 g of HA in 100 mL of water. If the density of the solution is 1.0 g/mL, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 10
A 2.0 g sample of a polymer, P, is dissolved in 100 mL of a solvent. If the concentration of the solution is 0.1 g/mL, what is the molar mass of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 300 g/mol
D. 400 g/mol
Question 11
A 2.0 L flask contains 0.050 M H2(g) and 0.050 M I2(g). If the reaction is: H2(g) + I2(g) → 2HI(g), calculate the equilibrium cons\tant (Kc) at 298 K.
A. 1.0
B. 1.0
C. 1.0
D. 1.0
Question 12
Determine the molar mass of a polymer with the following repeating unit: CH2CH2OCH2CH2OCH3. Assume that the polymer has a degree of polymerization of 100.
A. 200 g/mol
B. 300 g/mol
C. 400 g/mol
D. 500 g/mol
Question 13
A 1.0 M solution of NaOH is titrated with a solution of 0.5 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH in liters?
A. 0.1 L
B. 0.2 L
C. 0.4 L
D. 0.8 L
Question 14
A sample of a metal, M, is heated in a crucible until it melts. The temperature of the metal is measured to be 800°C. If the specific heat capacity of the metal is 0.1 J/g°C, what is the energy required to melt 100 g of the metal?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 15
A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the final pressure of the gas, assuming ideal behavior.
A. 1.8 atm
B. 2.1 atm
C. 2.5 atm
D. 3.1 atm

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