POST UTME OSUSTECH 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 L flask contains 0.500 atm of $\text{O}_2$ at 25°C. What is the partial pressure of $\text{O}_2$ in a mixture of $\text{O}_2$ and $\text{N}_2$ in the flask?
A. 0.250 atm
B. 0.500 atm
C. 0.750 atm
D. 1.00 atm
Question 2
A 5.00 g sample of a metal is dissolved in 50.0 mL of 0.100 M HCl. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 3
A 5.00 g sample of a metal is dissolved in 50.0 mL of 0.100 M HCl. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 4
The diagram below shows a molecular structure. Identify the type of bond between the two carbon atoms.
A. Sigma (σ) bond
B. Pi (π) bond
C. Sigma (σ) and Pi (π) bond
D. Hydrogen bond
Question 5
A 2.00 L flask contains 0.500 atm of $\text{O}_2$ at 25°C. What is the partial pressure of $\text{O}_2$ in a mixture of $\text{O}_2$ and $\text{N}_2$ in the flask?
A. 0.250 atm
B. 0.500 atm
C. 0.750 atm
D. 1.00 atm
Question 6
A solution contains 25.0 g of glu\cose (C6H12O6) dissolved in 250.0 mL of water. What is the concentration of the solution in molarity?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 7
A 2.00 L flask contains 0.500 atm of $\text{O}_2$ at 25°C. What is the partial pressure of $\text{O}_2$ in a mixture of $\text{O}_2$ and $\text{N}_2$ in the flask?
A. 0.250 atm
B. 0.500 atm
C. 0.750 atm
D. 1.00 atm
Question 8
A sample of a hydrocarbon has a molecular formula of C_4H_8. What is the type of hydrocarbon?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon
Question 9
Determine the oxidation state of the chromium atom in the compound [Cr(H2O)6]Cl3.
A. +3
B. +2
C. +6
D. 0
Question 10
A 2.00 L flask contains 0.500 atm of $\text{O}_2$ at 25°C. What is the partial pressure of $\text{O}_2$ in a mixture of $\text{O}_2$ and $\text{N}_2$ in the flask?
A. 0.250 atm
B. 0.500 atm
C. 0.750 atm
D. 1.00 atm
Question 11
A 2.00 L flask contains 0.500 atm of $\text{O}_2$ at 25°C. What is the partial pressure of $\text{O}_2$ in a mixture of $\text{O}_2$ and $\text{N}_2$ in the flask?
A. 0.250 atm
B. 0.500 atm
C. 0.750 atm
D. 1.00 atm
Question 12
Determine the number of unpaired electrons in the ground state of the chromium ion, Cr^\( 3+ \), u\sing the Aufbau principle and Hund's rule.
A. 1
B. 2
C. 3
D. 4
Question 13
The diagram below shows a redox reaction. Identify the oxidizing agent.
A. Zn
B. Cu
C. Ag
D. H2O
Question 14
A polymer has a molecular weight of 50,000 g/mol. If 2.50 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. ( 0.250 )
B. ( 0.500 )
C. ( 1.00 )
D. ( 2.00 )
Question 15
A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MCl2. Identify the metal M.
A. Na
B. Ca
C. Mg
D. Al

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