POST UTME SKYLINE UNIVERSITY 2020 Chemistry | Objective

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Question 1
A 1.00 M solution of H2SO4 is titrated with 1.00 M NaOH. If 20.0 mL of NaOH is required to reach the equivalence point, what is the pH of the solution at this point?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 2
A polymer is a large molecule composed of many repeated subunits. Which of the following is an example of a polymer?
A. \( CH_4 \)
B. \( C_6H_12O_6 \)
C. \( C_2H_4 \ \)_n )
D. \( H_2O \)
Question 3
A sample of a metal oxide is heated in a crucible until it reaches a temperature of 1000°C. If the mass of the oxide is 50 g, what is the mass of the metal that is produced?
A. 20 g
B. 25 g
C. 30 g
D. 40 g
Question 4
A polymer has a degree of polymerization (n) of 1000. If the molar mass of the monomer is 100 g/mol, what is the molar mass of the polymer?
A. 100,000 g/mol
B. 100,000.1 g/mol
C. 100,000.2 g/mol
D. 100,000.3 g/mol
Question 5
The sulfur cycle is an impor\tant environmental chemistry process. Which of the following is a key step in the sulfur cycle?
A. \( SO_2 + H_2O \rightarrow H_2SO_4 \)
B. \( SO_2 + O_2 \rightarrow SO_3 \)
C. \( SO_2 + H_2O \rightarrow H_2S \)
D. \( SO_2 + O_2 \rightarrow SO_4^{2-} \)
Question 6
The diagram below shows a titration setup.
A. \( HCl + NaOH \rightarrow NaCl + H_2O \)
B. \( H_2SO_4 + NaOH \rightarrow Na_2SO_4 + H_2O \)
C. \( HNO_3 + NaOH \rightarrow NaNO_3 + H_2O \)
D. \( H_3PO_4 + NaOH \rightarrow Na_3PO_4 + H_2O \)
Question 7
A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 cm3 of water. What is the molarity of the solution?
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 8
The reaction of nitrogen dioxide with water is a classic example of an environmental chemistry process. Which of the following is the correct equation for this reaction?
A. \( 2NO_2 + H_2O \rightarrow HNO_3 + NO \)
B. \( 2NO_2 + H_2O \rightarrow HNO_3 + HNO_2 \)
C. \( 2NO_2 + H_2O \rightarrow HNO_3 + O_2 \)
D. \( 2NO_2 + H_2O \rightarrow HNO_3 + NO_2 \)
Question 9
A 0.500 M solution of HCl is titrated with 0.500 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the pH of the solution at this point?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
A mixture of 25.0 g of NaCl and 15.0 g of KCl is dissolved in 250 cm3 of water. What is the molarity of the solution?
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 11
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of CO2 is 0.5 atm, what is the mole \fraction of CO2 in the gas mixture?
A. 0.2
B. 0.5
C. 0.8
D. 1.0
Question 12
A sample of a non-metallic element has a mass of 25.0 g and a volume of 5.00 cm3. What is the density of the element?
A. 2.50 g/cm3
B. 5.00 g/cm3
C. 10.0 g/cm3
D. 25.0 g/cm3
Question 13
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 14
A gas at 25°C and 1 atm is compressed to 2 atm. If the initial volume is 2.00 L, what is the final volume?
A. 1.00 L
B. 1.50 L
C. 2.00 L
D. 2.50 L
Question 15
The s\tandard reduction potential of the Cu2+/Cu couple is +0.34 V. What is the s\tandard reduction potential of the Cu+/Cu couple?
A. +0.17 V
B. +0.34 V
C. +0.51 V
D. +0.68 V

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