POST UTME UI 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of gas has a volume of 1.5 L at 300 K. If the pressure is increased to 2 atm, what is the new volume of the gas?
A. 1.2 L
B. 1.5 L
C. 1.8 L
D. 2.0 L
Question 2
A solution contains 0.1 M NaCl and 0.2 M Na2SO4. Calculate the total concentration of chloride ions in the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 3
A 1.00 M solution of NaOH is titrated with 1.00 M HCl. What is the pH of the solution after 50.0 mL of HCl has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 4
A catalyst is added to a reaction mixture containing 1.00 M H2(g) and 1.00 M I2(g). The reaction is: H2(g) + I2(g) → 2HI(g). If the rate cons\tant (k) for the reaction is 0.100 s^-1, what is the rate of reaction after 10.0 s?
A. 0.100 M/s
B. 0.200 M/s
C. 0.300 M/s
D. 0.400 M/s
Question 5
The diagram below shows a titration setup. What is the purpose of the burette?
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 6
A gas at 300 K has a volume of 2.5 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 3.2 L
B. 4.0 L
C. 5.0 L
D. 6.4 L
Question 7
A 0.500 M solution of H2SO4 is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
A reaction is said to be at equilibrium when the rates of forward and reverse reactions are equal. Which of the following is a characteristic of a reaction at equilibrium?
A. The concentrations of reac\tants and products remain cons\tant.
B. The reaction rate is zero.
C. The reaction is spon\taneous.
D. The reaction is non-spon\taneous.
Question 9
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A metal M reacts with chlorine gas to form a white solid. The molar mass of the metal is 50 g/mol. What is the molar mass of the compound formed?
A. 75 g/mol
B. 80 g/mol
C. 90 g/mol
D. 100 g/mol
Question 11
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 12
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 13
A 2.5 L flask contains 0.25 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^3 Pa
B. 2.02 x 10^3 Pa
C. 3.03 x 10^3 Pa
D. 4.04 x 10^3 Pa
Question 14
The reaction of methane with chlorine produces a mixture of chloromethane and dichloromethane. What is the major product of the reaction?
A. CH3Cl
B. CH2Cl2
C. CHCl3
D. CCl4
Question 15
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. 10
C. 14
D. 0

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