POST UTME RSU 2019 Chemistry | Objective

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Question 1
The diagram below shows the structure of a molecule. What is the type of bond between atoms A and B?
A. ( sigma ) bond
B. ( pi ) bond
C. ( sigma ) and ( pi ) bond
D. ( delta ) bond
Question 2
A metal (X) has a s\tandard reduction potential of +0.80 V. If a cell is constructed with X as the anode and a s\tandard hydrogen electrode as the cathode, what is the cell potential?
A. +0.40 V
B. +0.60 V
C. +0.80 V
D. +1.00 V
Question 3
A sample of a polymer is analyzed and found to have a molecular weight of 50000 g/mol. What is the degree of polymerization of the sample?
A. 10
B. 20
C. 30
D. 40
Question 4
The diagram below shows the titration curve for the reaction between HCl and NaOH. What is the pH of the solution at point X?
A. \( pH = \frac{1}{2} \log \frac{[H^+] [OH^-]}{[H_2O]} \)
B. \( pH = \frac{1}{2} \log \frac{[H_2O]}{[H^+] [OH^-]} \)
C. \( pH = \frac{1}{2} \log \frac{[H^+] [OH^-]}{[H_2O]} \)
D. \( pH = \frac{1}{2} \log \frac{[H_2O]}{[H^+] [OH^-]} \)
Question 5
The compound SO2Cl2 is an example of a sulfuryl chloride. What is the oxidation state of the sulfur atom in this compound?
A. +2
B. +4
C. +6
D. +8
Question 6
A 0.5 M solution of a strong acid, HCl, is titrated with 0.5 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 2
B. 3
C. 4
D. 5
Question 7
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the monomer unit.
A. 200 g/mol
B. 250 g/mol
C. 300 g/mol
D. 400 g/mol
Question 8
A 2.50 g sample of a polymer is dissolved in 100.0 mL of dichloromethane. If the solution has a vis\cosity of 0.0200 Pa·s at 25°C, calculate the number-average molecular weight of the polymer.
A. 5000 g/mol
B. 10000 g/mol
C. 20000 g/mol
D. 50000 g/mol
Question 9
A 2.50-g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.75 g, calculate the percentage yield of the metal oxide.
A. 60%
B. 70%
C. 80%
D. 90%
Question 10
A 2.5 M solution of CuSO4 is electrolyzed u\sing a platinum electrode. If the current is 5.0 A and the electrolysis is carried out for 2.5 hours, what is the mass of copper deposited at the cathode?
A. 0.25 g
B. 0.50 g
C. 0.75 g
D. 1.0 g
Question 11
A 100.0 mL sample of a solution containing 10.0 g/L of NaCl is titrated with 0.100 M AgNO3. If 25.0 mL of AgNO3 is required to reach the equivalence point, calculate the concentration of Cl- ions in the solution.
A. 0.050 M
B. 0.075 M
C. 0.100 M
D. 0.125 M
Question 12
A 0.100 M solution of FeCl3 is electrolyzed u\sing a platinum electrode. What is the mass of Cl2 gas collected at the anode after 2.00 hours?
A. 0.500 g
B. 0.750 g
C. 1.00 g
D. 1.25 g
Question 13
The diagram below shows the energy level diagram for a hydrogen atom. What is the energy of the electron in the 3rd orbit?
A. \( E_n = -\frac{13.6}{n^2} \) eV
B. \( E_n = \frac{13.6}{n^2} \) eV
C. \( E_n = -\frac{13.6}{n} \) eV
D. \( E_n = \frac{13.6}{n} \) eV
Question 14
The pH of a solution is 4.5. What is the concentration of hydrogen ions in the solution?
A. 1.0 x 10^{-4.5} M
B. 1.0 x 10^{-5.5} M
C. 1.0 x 10^{-6.5} M
D. 1.0 x 10^{-7.5} M
Question 15
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 25.0 mL of NaOH has been added.
A. \( pH = \frac{1}{2} \log \frac{[H^+] [OH^-]}{[H_2O]} \)
B. \( pH = \frac{1}{2} \log \frac{[H_2O]}{[H^+] [OH^-]} \)
C. \( pH = \frac{1}{2} \log \frac{[H^+] [OH^-]}{[H_2O]} \)
D. \( pH = \frac{1}{2} \log \frac{[H_2O]}{[H^+] [OH^-]} \)

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