POST UTME COVENANT UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of a weak base B is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of the base.
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M
Question 2
Determine the oxidation state of the sulfur atom in the compound H2SO4.
A. +2
B. +4
C. +6
D. +8
Question 3
Calculate the concentration of a solution that contains 25 g of NaCl in 250 mL of water.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
A 1.0 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1.0 dm3 of water. Calculate the concentration of the solution in mol/dm3.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 5
The atomic radius of an element is 100 pm. If the element is in its ground state, what is the expected value of its atomic radius when it is in its first excited state?
A. 120 pm
B. 80 pm
C. 90 pm
D. 110 pm
Question 6
The half-life of a radioactive subs\tance is 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?
A. 100 Bq
B. 200 Bq
C. 500 Bq
D. 1000 Bq
Question 7
Calculate the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 8
A 1.00 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the volume of the gas at 300 K u\sing Charles's law.
A. 1.01 L
B. 1.02 L
C. 1.03 L
D. 1.04 L
Question 9
Identify the type of bond that exists between the carbon and oxygen atoms in CO2.
A. ionic
B. covalent
C. metallic
D. hydrogen
Question 10
A 1 M solution of HCl is titrated with 1 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 11
A metal M reacts with chlorine gas to form a white solid MX. If 2.5 g of M is heated in a stream of Cl2, 3.2 g of MX is produced. Calculate the empirical formula of MX.
A. MCl2
B. MCl3
C. MCl4
D. MCl5
Question 12
A sample of nitrogen gas is collected over water at 25°C and 1 atm. If the partial pressure of water vapor is 0.031 atm, calculate the mole \fraction of nitrogen gas.
A. 0.99
B. 0.98
C. 0.97
D. 0.96
Question 13
A 25 cm3 sample of 0.2 M H2SO4 is titrated with 0.2 M NaOH. Calculate the number of moles of H2SO4.
A. 0.01
B. 0.02
C. 0.03
D. 0.04
Question 14
A 2.5 M solution of sodium hydroxide is mixed with a 1.5 M solution of hydrochloric acid. If 50 mL of the sodium hydroxide solution is added to 100 mL of the hydrochloric acid solution, calculate the pH of the resulting solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 15
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4

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