POST UTME VERITAS UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the resulting pH after the reaction is complete?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 2
A 2.00 g sample of sulfur is burned in oxygen to produce sulfur dioxide. If the reaction is 100% efficient, what is the volume of SO2 produced at STP?
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 3
The energy of an electron in the nth orbit of a hydrogen atom is given by the equation \( E_n = -\frac{13.6}{n^2} \) eV. What is the energy of an electron in the 3rd orbit?
A. -3.4
B. -1.5
C. 1.1
D. 13.6
Question 4
A 2.00 L flask contains 0.500 mol of an ideal gas at 25°C. What is the number of moles of gas in the flask?
A. 0.250 mol
B. 0.500 mol
C. 0.750 mol
D. 1.00 mol
Question 5
A 2.50 g sample of an unknown hydrocarbon is burned in a combustion calorimeter, producing 8.00 mL of CO2 gas at STP. If the molar mass of the hydrocarbon is 84.0 g/mol, what is its empirical formula?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 6
A 2.50 g sample of an unknown hydrocarbon is burned in a combustion calorimeter, producing 8.00 mL of CO2 gas at STP. If the molar mass of the hydrocarbon is 84.0 g/mol, what is its empirical formula?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 7
The diagram below shows a simple black and white chemistry apparatus showing a titration setup. What is the purpose of the pipette in this experiment?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution
Question 8
A 0.500 L flask contains 0.100 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?
A. 0.500 atm
B. 1.00 atm
C. 1.50 atm
D. 2.00 atm
Question 9
A sample of oxygen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 300 K. What is the new volume of the gas if the pressure is increased to 3.0 atm and the temperature is decreased to 200 K?
A. 1.2 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 10
The diagram below shows a titration setup. What is the purpose of the burette in this experiment?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution
Question 11
A 2.00 L flask contains 0.500 mol of an ideal gas at 25°C. What is the pressure of the gas in the flask?
A. 1.00 atm
B. 2.00 atm
C. 3.00 atm
D. 4.00 atm
Question 12
A sample of carbon dioxide (CO2) is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the volume of the CO2 gas collected?
A. 22.4 L
B. 44.8 L
C. 67.2 L
D. 89.6 L
Question 13
A sample of 1.00 L 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. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 14
A 2.00 g sample of a hydrocarbon is burned in oxygen to produce 3.00 L of CO2 at STP. Calculate the empirical formula of the hydrocarbon.
A. CH4
B. C2H6
C. C3H8
D. C4H10
Question 15
A 1.00 L of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?
A. 3.00
B. 4.00
C. 5.00
D. 6.00

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