POST UTME KSU 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A mixture of 2 g of NaCl and 1 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1
B. 0.15
C. 0.2
D. 0.25
Question 2
A 25 mL sample of a 0.5 M solution of NaOH is added to 50 mL of a 0.2 M solution of HCl. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 3
Determine the empirical formula of a compound containing 40.0 g of carbon, 6.0 g of hydrogen, and 54.0 g of oxygen.
A. CH2O
B. C2H4O2
C. C3H6O3
D. C4H8O4
Question 4
The atomic number of an element is 26. What is the number of protons in the nucleus of an atom of this element?
A. 25
B. 26
C. 27
D. 28
Question 5
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 7
C. 10
D. 12
Question 6
A sample of $\text{H}_2\text{SO}_4$ has a mass of 250.0 g. If the molar mass of $\text{H}_2\text{SO}_4$ is 98.08 g/mol, calculate the number of moles of $\text{H}_2\text{SO}_4$ present in the sample.
A. 2.55 mol
B. 2.56 mol
C. 2.57 mol
D. 2.58 mol
Question 7
A 100 mL sample of a 0.1 M solution of H2SO4 is titrated with a 0.2 M solution of NaOH. What is the pH of the resulting solution after 50 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 8
A solution contains 0.500 M $\text{CaCl}_2$ and 0.500 M $\text{NaOH}$. Calculate the concentration of $\text{Ca(OH)}_2$ formed after the reaction is complete.
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 9
A 10.0 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 10
A 250.0 g sample of a mixture of $\text{KNO}_3$ and $\text{NaCl}$ is dissolved in 250.0 mL of water. If the resulting solution has a conductivity of 1.50 mS/cm, calculate the molar conductivity of the solution.
A. 0.0100 S m^2/mol
B. 0.0150 S m^2/mol
C. 0.0200 S m^2/mol
D. 0.0250 S m^2/mol
Question 11
Determine the number of moles of $\text{O}_2$ required to react with 2.50 moles of $\text{C}_2\text{H}_4$ according to the equation $\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$.
A. 1.25 moles
B. 2.50 moles
C. 3.75 moles
D. 5.00 moles
Question 12
A 2.0 L sample of a gas at 2.5 atm and 298 K is compressed to 1.0 L at cons\tant temperature. What is the new pressure of the gas?
A. 5
B. 6.25
C. 7.5
D. 8.75
Question 13
A 50 mL sample of a 0.2 M solution of HCl is added to 100 mL of a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 14
A gas at 300 K has a volume of 2 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 1.6
B. 2.4
C. 3.2
D. 4.8
Question 15
A solution of 0.1 M FeCl3 is electrolyzed u\sing a platinum electrode. What is the mass of iron deposited at the cathode after 2 hours?
A. 0.06
B. 0.09
C. 0.12
D. 0.15

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