POST UTME KSU 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 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 pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
D. 4
Question 4
A solution contains 2.5 g of glu\cose (C6H12O6) dissolved in 100 mL of water. What is the concentration of the solution in g/L?
A. 25
B. 50
C. 75
D. 100
Question 5
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 6
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 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 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 9
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
Question 10
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 11
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, calculate the partial pressure of the gas.
A. 0.970 atm
B. 0.980 atm
C. 0.990 atm
D. 1.00 atm
Question 12
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 13
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 14
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 298 K. What is the number of moles of nitrogen gas present?
A. 1
B. 2
C. 3
D. 4
Question 15
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

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