POST UTME SUMMIT UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The rate cons\tant of a reaction is given by the equation k = Ae^\( -Ea/RT \). If the rate cons\tant is 0.1 s^-1, the activation energy is 50 kJ/mol, and the temperature is 300 K, what is the value of A?
A. 1
B. 2
C. 3
D. 4
Question 2
Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in an aqueous solution.
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Condensation reaction
Question 3
A 0.750 M solution of HCl is mixed with a 0.500 M solution of NaOH. Calculate the concentration of the resulting solution after the reaction is complete.
A. 0.625 M
B. 0.750 M
C. 0.875 M
D. 1.00 M
Question 4
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 5
A solution of sodium hydroxide (NaOH) is prepared by dissolving 10.0 g of NaOH in 100.0 mL of water. What is the molarity of the solution?
A. 0.10 M
B. 0.50 M
C. 1.00 M
D. 2.00 M
Question 6
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the concentration of HCl after the addition of 25.0 mL of NaOH?
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 7
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 8
A 5.00 g sample of a non-metallic element is found to have a mass of 3.00 g after being heated in a Bunsen burner flame. What is the mass of oxygen that was added to the element during combustion?
A. 2.00 g
B. 1.50 g
C. 1.00 g
D. 0.50 g
Question 9
A 2.5 L flask contains 0.500 mol of an ideal gas at 298 K. What is the pressure of the gas?
A. 1.01 x 10^2 Pa
B. 1.01 x 10^3 Pa
C. 1.01 x 10^4 Pa
D. 1.01 x 10^5 Pa
Question 10
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl added.
A. 0.0025 mol
B. 0.0050 mol
C. 0.0075 mol
D. 0.0100 mol
Question 11
A 250 mL sample of a 0.500 M solution of NaOH is titrated with a 1.0 M solution of HCl. What is the volume of HCl required to reach the equivalence point?
A. 100 mL
B. 200 mL
C. 250 mL
D. 300 mL
Question 12
The atomic radius of an element decreases across a period from left to right. Which of the following elements has the largest atomic radius?
A. Li
B. Na
C. K
D. Rb
Question 13
A sample of a gas is collected over water at a temperature of 25°C and a pressure of 1.00 atm. If the vapor pressure of water at 25°C is 0.0313 atm, what is the partial pressure of the gas?
A. 0.9687 atm
B. 0.9697 atm
C. 0.9707 atm
D. 0.9717 atm
Question 14
A 2.50 g sample of a non-metallic element is found to have a mass of 2.00 g after being heated in a Bunsen burner flame. What is the mass of oxygen that was added to the element during combustion?
A. 0.50 g
B. 1.00 g
C. 1.50 g
D. 2.00 g
Question 15
A 50.0 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100.0 mL

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