POST UTME UNILORIN 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 2
A polymer is composed of 85% polyethylene (PE) and 15% polypropylene (PP). If 100 g of the polymer is dissolved in a solvent, what is the mass of PE dissolved?
A. 85 g
B. 15 g
C. 17.5 g
D. 92.5 g
Question 3
A 2.5 L flask contains 0.15 mol of CO2 at 25°C. Calculate the number of moles of CO2 that will be present in the flask at 50°C.
A. 0.15 mol
B. 0.15 mol
C. 0.15 mol
D. 0.15 mol
Question 4
A 2.5g sample of a metal carbonate is heated to a cons\tant mass. If 0.75g of the metal oxide is obtained, calculate the percentage yield of the metal oxide.
A. 50%
B. 60%
C. 70%
D. 80%
Question 5
A 1.0 M solution of a salt Na2SO4 is prepared by dissolving 58.44 g of Na2SO4 in 1 L of water. What is the molarity of the sulfate ion \( SO42- \) in the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 6
A solution containing 0.1 M HCl and 0.1 M NaOH is prepared. Calculate the pH of the solution after 10 minutes.
A. 1
B. 2
C. 3
D. 4
Question 7
A 2.0g sample of a metal hydroxide is dissolved in 100mL of water to give a solution with a pH of 10.5. Calculate the concentration of the metal hydroxide.
A. 0.1M
B. 0.2M
C. 0.3M
D. 0.4M
Question 8
A metal 'M' reacts with dilute HCl to produce a gas 'G'. The reaction is as follows: M + 2HCl → G + 2H2O. If 2.5 g of M reacts with 10 cm3 of 2 M HCl, calculate the volume of G produced at STP.
A. 10 cm3
B. 20 cm3
C. 30 cm3
D. 40 cm3
Question 9
A sample of gas occupies 2.5 L at 27°C and 1 atm. What is the volume of the gas at 37°C and 3 atm?
A. 4.2 L
B. 3.2 L
C. 2.5 L
D. 1.5 L
Question 10
The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.05 M
B. 0.1 M
C. 0.05 M
D. 0.01 M
Question 11
The reaction between potassium permanganate and hydrogen peroxide is a classic example of a redox reaction. What is the oxidation state of manganese in KMnO4?
A. +7
B. +6
C. +5
D. +4
Question 12
A 2.5 L flask contains 0.15 mol of CO2 at 25°C. Calculate the partial pressure of CO2 in the flask.
A. 0.75 atm
B. 0.75 atm
C. 0.75 atm
D. 0.75 atm
Question 13
A 0.25 M solution of NaOH is mixed with a 0.25 M solution of HCl. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 14
A 1.0g sample of a metal is heated to a cons\tant mass. If 0.5g of the metal oxide is obtained, calculate the percentage yield of the metal oxide.
A. 50%
B. 60%
C. 70%
D. 80%
Question 15
A diagram of a gas apparatus is shown below. If the pressure of the gas is 2.0atm and the volume is 10.0L, calculate the number of moles of gas present.
A. 0.2mol
B. 0.4mol
C. 0.6mol
D. 0.8mol

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