POST UTME NOUN 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A mixture of 1.0 g of an unknown hydrocarbon and 1.0 g of an unknown alcohol is dissolved in 100 mL of water. What is the expected product of the reaction between the hydrocarbon and the alcohol?
A. ester
B. aldehyde
C. ketone
D. alcohol
Question 2
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
D. 4
Question 3
The half-life of a radioactive subs\tance is 5 years. If a sample of the subs\tance initially contains 100 g, what is the mass of the subs\tance remaining after 10 years?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 4
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. 1
B. 2
C. 7
D. 10
Question 5
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
D. 4
Question 6
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the number of molecules of the gas u\sing the ideal gas law.
A. 1.5 x 10^22
B. 2.0 x 10^22
C. 2.5 x 10^22
D. 3.0 x 10^22
Question 7
A 1.0 L sample of a gas at 2.0 atm and 25°C is collected over water at 25°C. If the partial pressure of water vapor is 0.02 atm, what is the mole \fraction of the gas?
A. 0.98
B. 0.99
C. 0.995
D. 0.998
Question 8
The diagram below shows a titration setup. Identify the part labeled A.
A. A
B. B
C. C
D. D
Question 9
A metal oxide is reduced to its corresponding metal by heating in a stream of hydrogen gas. Which of the following metals is most likely to be produced?
A. Zn
B. Fe
C. Cu
D. Ag
Question 10
A solution of 0.1 M sodium hydroxide is titrated with 0.1 M hydrochloric acid. What is the pH of the resulting solution after 25 mL of hydrochloric acid has been added?
A. 7
B. 8
C. 9
D. 10
Question 11
A polymer has a molecular weight of 5000 g/mol. Calculate the number of monomer units in the polymer.
A. 1000
B. 500
C. 250
D. 125
Question 12
The density of a certain metal is 8.0 g/cm^3. If a sample of the metal has a mass of 50 g, what is the volume of the sample?
A. 6.25 cm^3
B. 12.5 cm^3
C. 25 cm^3
D. 50 cm^3
Question 13
A 2 M solution of HCl is mixed with a 2 M solution of NaOH. What is the pH of the resulting solution?
A. 0
B. 1
C. 2
D. 3
Question 14
A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 15
A sample of water contains 10 ppm of dissolved oxygen. What is the concentration of oxygen in the water in mg/L?
A. 10
B. 20
C. 30
D. 40

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