POST UTME AFE BABALOLA UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.100 M solution of NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 50.0 mL of HCl?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 2
A 2.50 g sample of a polymer is dissolved in 100.0 mL of a solvent. If the polymer is 95% soluble, what is the molar mass of the polymer?
A. 1.00 x 10^4 g/mol
B. 2.00 x 10^4 g/mol
C. 3.00 x 10^4 g/mol
D. 4.00 x 10^4 g/mol
Question 3
A solution of HCl is 0.100 M. What is the pH of the solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 4
Calculate the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of methane (CH4) react with excess oxygen gas according to the equation: CH4 + 2O2 → CO2 + 2H2O.
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 5
A 2.50 L flask contains 0.250 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa
Question 6
Determine the number of moles of ethene (C2H4) produced when 2.50 g of C2H4 is decomposed at cons\tant pressure and temperature.
A. 0.0500 mol
B. 0.100 mol
C. 0.200 mol
D. 0.500 mol
Question 7
A 2.50 g sample of a gas is collected over water at 25°C and 1.00 atm. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 0.977 atm
B. 0.983 atm
C. 0.987 atm
D. 0.993 atm
Question 8
Determine the number of moles of carbon dioxide produced from the combustion of 2.5 g of glu\cose (C6H12O6) according to the equation: C6H12O6 + 6O2 → 6CO2 + 6H2O.
A. 0.25 mol
B. 0.5 mol
C. 1.0 mol
D. 1.5 mol
Question 9
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl).
A. 0.1
B. 1.0
C. 2.0
D. 3.0
Question 10
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm. What is the volume of the gas at a pressure of 3.0 atm, assuming the temperature remains cons\tant?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 11
A sample of a gas has a volume of 2.50 L at a pressure of 1.00 atm. What is the volume of the gas at a pressure of 2.00 atm, assuming the temperature remains cons\tant?
A. 1.25 L
B. 2.50 L
C. 3.75 L
D. 5.00 L
Question 12
A sample of 0.500 L 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 mmHg, what is the partial pressure of the gas?
A. 0.977 atm
B. 0.983 atm
C. 0.987 atm
D. 0.993 atm
Question 13
The s\tandard electrode potential of the zinc-zinc ion couple is -0.76 V. Calculate the s\tandard electrode potential of the copper-copper ion couple if the s\tandard electrode potential of the copper-copper ion couple is 0.34 V.
A. 0.10 V
B. 0.34 V
C. 0.50 V
D. 0.76 V
Question 14
A 5.00 g sample of a metal is heated in a crucible until it is completely melted. If the density of the metal is 8.00 g/cm^3, what is the volume of the metal?
A. 0.625 cm^3
B. 0.750 cm^3
C. 0.875 cm^3
D. 1.00 cm^3
Question 15
A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 2.5 M solution of hydrochloric acid (HCl). Calculate the pH of the resulting solution after the reaction is complete.
A. 1
B. 2
C. 3
D. 4

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