POST UTME RSU 2019 Chemistry | Objective

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Question 1
At 25°C, the vapor pressure of a solution containing 10.0 g of urea in 50.0 g of water is 750.0 mmHg. If the vapor pressure of pure water at 25°C is 76.0 mmHg, calculate the mole \fraction of urea in the solution.
A. 0.010
B. 0.020
C. 0.030
D. 0.040
Question 2
A 1.0 M solution of a weak base, B, is titrated with 1.0 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the pOH of the resulting solution?
A. 2
B. 3
C. 4
D. 5
Question 3
A 0.1 M solution of a monoprotic acid, HA, is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 3
B. 4
C. 5
D. 6
Question 4
A 0.500 M solution of NaOH is titrated with 0.250 M HCl. What is the pH of the solution after 25.0 mL of HCl has been added?
A. 8.00
B. 8.25
C. 8.50
D. 9.00
Question 5
A 1.0 M solution of HCl is mixed with 1.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 6
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, and the rate of reaction is 0.05 M/s after 10 minutes.
A. \( k = \frac{2.303}{t} \log \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \)
B. \( k = \frac{2.303}{t} \log \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \)
C. \( k = \frac{2.303}{t} \log \frac{[NO]_0 [O_2]_0}{[NO_2]_t} \)
D. \( k = \frac{2.303}{t} \log \frac{[NO_2]_t}{[NO]_0 [O_2]_0} \)
Question 7
The polymerization of styrene to polystyrene is an example of a chain reaction. What type of initiator is typically used in this reaction?
A. Free radical initiator
B. Cationic initiator
C. Anionic initiator
D. Ziegler-Natta catalyst
Question 8
A 0.500 M solution of NaCl is electrolyzed u\sing a platinum electrode. What is the mass of Cl2 gas collected at the cathode after 2.00 hours?
A. 0.250 g
B. 0.500 g
C. 1.00 g
D. 2.00 g
Question 9
The diagram below shows a setup for a chemical reaction. If 15 mL of 0.2 M HCl is added to 20 mL of 0.2 M NaOH, what is the pH of the resulting solution?
A. 4
B. 5
C. 6
D. 7
Question 10
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 11
A 50.0 mL sample of a solution containing 5.0 g/L of glu\cose is titrated with 0.100 M H2SO4. If 20.0 mL of H2SO4 is required to reach the equivalence point, calculate the concentration of glu\cose in the solution.
A. 2.5 g/L
B. 5.0 g/L
C. 10.0 g/L
D. 15.0 g/L
Question 12
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 13
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 14
A solution of sulfuric acid (H2SO4) is prepared by dissolving 25.0 g of H2SO4 in 100 mL of water. What is the concentration of the solution in terms of molarity?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 15
A 2.00 M solution of HCl is titrated with a 1.00 M solution of NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

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