POST UTME UNIPORT 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mol of CO(g).
A. -282.5 kJ/mol
B. -282.5 kJ/mol
C. -282.5 kJ/mol
D. -282.5 kJ/mol
Question 2
The reaction between chlorine gas and sodium hydroxide solution produces a compound with the formula NaClO. What is the oxidation state of chlorine in this compound?
A. 0
B. -1
C. +1
D. +2
Question 3
A sample of a gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 4
The compound C6H12O6 is a sugar that can be oxidized to form a compound with the formula C6H12O6. What is the oxidation state of carbon in this compound?
A. +2
B. +3
C. +4
D. +5
Question 5
A polymer has a molecular weight of 50,000 g/mol. If 2.0 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution?
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1.0 M
Question 6
A solution contains 5.0 g of NaCl. If 25.0 mL of 0.1 M HCl is added to the solution, what is the new concentration of the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 7
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 8
A 2.5 L flask contains 0.15 mol of an ideal gas at 298 K. Calculate the pressure of the gas in the flask.
A. 1.2 × 10^5 Pa
B. 1.2 × 10^4 Pa
C. 1.2 × 10^3 Pa
D. 1.2 × 10^2 Pa
Question 9
Determine the oxidation state of the central atom in the compound [Cr(H2O)6]Cl2.
A. +3
B. +2
C. +6
D. +1
Question 10
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C at cons\tant pressure, what is the new volume of the gas?
A. 3.125 L
B. 4.166 L
C. 5.0 L
D. 6.25 L
Question 11
A 2.5 L flask contains 0.15 mol of an ideal gas at 298 K. Calculate the pressure of the gas in the flask.
A. 1.2 × 10^5 Pa
B. 1.2 × 10^4 Pa
C. 1.2 × 10^3 Pa
D. 1.2 × 10^2 Pa
Question 12
A diagram of a titration apparatus is shown below. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the pH of the solution
C. To measure the temperature of the solution
D. To measure the density of the solution
Question 13
A 2.0 L flask contains a mixture of nitrogen and oxygen gases at a total pressure of 2.5 atm. If the mole \fraction of oxygen is 0.4, what is the partial pressure of nitrogen?
A. 1.0 atm
B. 1.2 atm
C. 1.5 atm
D. 2.0 atm
Question 14
A solution of NaOH is 0.20 M. If 50.0 mL of this solution is titrated with 0.10 M HCl, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 15
A 10% solution of NaOH is prepared by dissolving 10 g of NaOH in 90 g of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

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