POST UTME CHRISTOPHER UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows the reaction between nitrogen and oxygen to form nitrogen dioxide.
A. 2NO + O2 → 2NO2
B. 2NO2 + O2 → 2NO
C. 2NO + 2O2 → 2NO2
D. 2NO2 + 2O2 → 2NO
Question 2
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. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 3
A 2.00 g sample of a subs\tance is dissolved in 100.0 mL of water. If the resulting solution has a concentration of 0.100 M, what is the molar mass of the subs\tance?
A. 20.0 g/mol
B. 40.0 g/mol
C. 60.0 g/mol
D. 80.0 g/mol
Question 4
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 5
A sample of 1.0 g of a subs\tance is dissolved in 100 mL of water. If the molarity of the solution is 0.2 M, what is the molar mass of the subs\tance?
A. 20 g/mol
B. 40 g/mol
C. 60 g/mol
D. 80 g/mol
Question 6
A reaction is represented by the equation: 2A + B → 2C + D. If 2 moles of A and 1 mole of B are mixed, what is the limiting reac\tant?
A. A
B. B
C. C
D. D
Question 7
The element with atomic number 12 is _______.
A. Magnesium
B. Calcium
C. Strontium
D. Barium
Question 8
A sample of a gas has a volume of 2 L at a pressure of 1 atm and a temperature of 273 K. What is the new volume of the gas if the pressure is increased to 2 atm and the temperature is increased to 300 K?
A. 4 L
B. 6 L
C. 8 L
D. 10 L
Question 9
The rate cons\tant for 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. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 10
A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. The pH of the solution after the addition of 20 mL of HCl is 3.5. What is the pH of the solution after the addition of 40 mL of HCl?
A. 2.0
B. 2.5
C. 3.0
D. 3.5
Question 11
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 12
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a weak base B. The resulting solution is a buffer with a pH of 4.5. If 10 mL of 1 M HCl is added to the buffer, what is the new pH?
A. 3.5
B. 4.0
C. 4.5
D. 5.0
Question 13
A sample of a subs\tance has a mass of 25 g and a volume of 10 mL. What is its density?
A. 2.5 g/mL
B. 2.0 g/mL
C. 1.5 g/mL
D. 1.0 g/mL
Question 14
A polymer has a molecular weight of 100,000 g/mol. If 10 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1 g/L
C. 10 g/L
D. 100 g/L
Question 15
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: NaOH + HCl → NaCl + H2O. What is the type of reaction?
A. Synthesis reaction
B. Decomposition reaction
C. Neutralization reaction
D. Combustion reaction

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