POST UTME IMS U 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. If the resulting solution is then titrated with 1.0 M NaOH, what is the pH of the solution at the equivalence point?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 2
A solution contains 0.0500 M CaCl2 and 0.0500 M Na2SO4. Determine the molar solubility of CaSO4.
A. 0.0100 M
B. 0.0200 M
C. 0.0300 M
D. 0.0400 M
Question 3
A solution contains 0.1 M NaCl and 0.1 M CaCl2. Calculate the molar conductivity of the solution at 25°C.
A. 0.01 S cm^2/mol
B. 0.1 S cm^2/mol
C. 1 S cm^2/mol
D. 10 S cm^2/mol
Question 4
Determine the number of moles of oxygen gas (O2) produced at s\tandard temperature and pressure (STP) when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the balanced equation: 2H2 + O2 → 2H2O.
A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles
Question 5
A 10.0 mL sample of a 0.500 M solution of sodium chloride (NaCl) is diluted to a total volume of 50.0 mL. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.250 M
C. 0.500 M
D. 1.00 M
Question 6
A diagram of a cell is shown below. What is the purpose of the cathode?
A. To receive electrons
B. To release electrons
C. To conduct electricity
D. To generate heat
Question 7
The reaction between CH3OH and HCl is an example of.
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Condensation reaction
Question 8
The boiling point of a subs\tance is a measure of the energy required to change the state of the subs\tance from liquid to gas. Which of the following is a correct explanation for the boiling point of a subs\tance?
A. The boiling point is a measure of the energy required to change the state of the subs\tance from solid to liquid.
B. The boiling point is a measure of the energy required to change the state of the subs\tance from liquid to gas.
C. The boiling point is a measure of the energy required to change the state of the subs\tance from gas to liquid.
D. The boiling point is a measure of the energy required to change the state of the subs\tance from liquid to solid.
Question 9
A 0.500 M solution of acetic acid (CH3COOH) is titrated with a 0.500 M solution of sodium hydroxide (NaOH). If 25.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the acetic acid solution?
A. 0.250 M
B. 0.500 M
C. 1.00 M
D. 2.00 M
Question 10
The atomic radius of an element is 100 pm. If the element is in group 1A, what is its atomic number?
A. 3
B. 11
C. 19
D. 37
Question 11
A 10.0 g sample of a polymer is dissolved in 100.0 mL of solvent. What is the concentration of the solution in g/mL?
A. 0.1 g/mL
B. 0.2 g/mL
C. 0.3 g/mL
D. 0.4 g/mL
Question 12
Calculate the enthalpy change for the reaction: 2Na(s) + Cl2(g) → 2NaCl(s). The s\tandard enthalpy of formation of NaCl is -411 kJ/mol.
A. -822 kJ
B. -411 kJ
C. -411 kJ/mol
D. -822 kJ/mol
Question 13
A 0.1 M solution of CuSO4 is electrolyzed at a cons\tant current of 1.0 A for 10 minutes. If the electrolysis is carried out in a 1.0 M NaCl solution, what is the mass of Cu deposited?
A. 0.25 g
B. 0.50 g
C. 0.75 g
D. 1.0 g
Question 14
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2?
A. 0.5 atm
B. 0.7 atm
C. 0.9 atm
D. 1.1 atm
Question 15
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4

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