POST UTME OAU 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M Cu^2+ ions and 0.1 M SO_4^2- ions. What is the concentration of CuSO_4 in the solution?
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1.0 M
Question 2
A metal $M$ has a s\tandard electrode potential of $-0.5,V$. If a $1,M$ solution of $M^{2+}$ is electrolyzed at $25^circ C$, calculate the cell potential.
A. -0.5 V
B. -1 V
C. -1.5 V
D. -2 V
Question 3
A solution of 0.100 M HCl is titrated with 0.100 M NaOH. What is the number of moles of NaOH required to react with 25.0 mL of HCl?
A. 0.00125 mol
B. 0.00250 mol
C. 0.00500 mol
D. 0.0125 mol
Question 4
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 5
A 10 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the number of moles of NaOH required.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 6
A metal M has a density of 8.0 g/cm^3. What is the volume of 100 g of the metal?
A. 12.5 cm^3
B. 25.0 cm^3
C. 50.0 cm^3
D. 100 cm^3
Question 7
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of potassium chlorate (KClO3) decompose according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 1.5
B. 2.5
C. 3.75
D. 4.5
Question 8
A solution contains 0.1 M Cu^2+ ions and 0.1 M SO_4^2- ions. What is the concentration of CuSO_4 in the solution?
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1.0 M
Question 9
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 10
A solution of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 11
A $0.1,M$ solution of $HCl$ is titrated with a $0.1,M$ solution of $NaOH$. If $25,cm^3$ of $NaOH$ is required to reach the equivalence point, calculate the volume of $HCl$ in $cm^3$.
A. 50 cm^3
B. 75 cm^3
C. 100 cm^3
D. 125 cm^3
Question 12
A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after the addition of 20 mL of NaOH.
A. 1
B. 2
C. 3
D. 4
Question 13
A solution of potassium dichromate (K2Cr2O7) is titrated with a solution of iron(II) sulfate (FeSO4). The reaction is as follows: K2Cr2O7 + 6FeSO4 + 7H2O → K2SO4 + 2Cr(OH)3 + 6Fe(OH)3. If 25.0 mL of 0.100 M K2Cr2O7 is titrated with 0.0500 M FeSO4, what is the number of moles of FeSO4 required to react with the K2Cr2O7?
A. 0.00125 mol
B. 0.00250 mol
C. 0.00500 mol
D. 0.0125 mol
Question 14
A 50 mL sample of a solution contains 0.5 g of NaCl. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 15
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas.
A. 1.1 atm
B. 1.2 atm
C. 1.3 atm
D. 1.4 atm

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