POST UTME PAN-ATLANTIC UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. The pH of the solution is measured at various points during the titration. What is the pH of the solution when the volume of NaOH added is 15.0 mL?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 2
The atomic radius of an element in Group 1 of the Periodic Table is 250 pm. If the element is in its +1 oxidation state, what is the radius of the ion?
A. 240 pm
B. 220 pm
C. 200 pm
D. 180 pm
Question 3
A sample of 1.0 g of glu\cose (C6H12O6) is dissolved in 100 mL of water. What is the concentration of the solution in g/L?
A. 10 g/L
B. 20 g/L
C. 30 g/L
D. 40 g/L
Question 4
A 0.1 M solution of acetic acid is titrated with a 0.1 M solution of sodium hydroxide. If 25 mL of sodium hydroxide is required to reach the equivalence point, what is the pH of the solution at the equivalence point?
A. 1
B. 2
C. 3
D. 4
Question 5
The equilibrium cons\tant, Kc, for the reaction 2NO(g) ⇌ N2(g) + O2(g) is 1.8 × 10^\( -3 \) at 25°C. What is the value of Kp?
A. 1.8 × 10^\( -3 \)
B. 3.6 × 10^\( -3 \)
C. 5.4 × 10^\( -3 \)
D. 7.2 × 10^\( -3 \)
Question 6
A 50.0 g sample of a polymer is dissolved in 100.0 mL of a solvent. The resulting solution has a vis\cosity of 0.500 Pa·s. What is the molar mass of the polymer?
A. 1000 g/mol
B. 2000 g/mol
C. 5000 g/mol
D. 10000 g/mol
Question 7
A 2.50-L flask contains 0.150 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?
A. 0.100 atm
B. 0.200 atm
C. 0.300 atm
D. 0.400 atm
Question 8
A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 9
A metal (M) reacts with oxygen (O2) to form a metal oxide (MO). The balanced equation for the reaction is 4M + 3O2 → 2MO. If 25.0 g of M is burned in air, what is the volume of O2 consumed?
A. 10.0 L
B. 20.0 L
C. 30.0 L
D. 40.0 L
Question 10
A solution of 0.1 M sodium chloride is prepared by dissolving 10 g of sodium chloride in 1 L of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
The diagram below shows a titration setup. 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 12
The reaction of sodium hydroxide (NaOH) with hydrochloric acid (HCl) is a classic example of a neutralization reaction. What is the pH of the resulting solution after the reaction is complete?
A. 7
B. 10
C. 14
D. 0
Question 13
The diagram below shows a titration setup. What is the purpose of the pipette in this setup?
A. To measure the volume of the analyte
B. To measure the volume of the titrant
C. To mix the analyte and titrant
D. To separate the analyte and titrant
Question 14
A 50.0 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. The resulting metal has a mass of 40.0 g. What is the percentage decrease in mass?
A. 20.0%
B. 30.0%
C. 40.0%
D. 50.0%
Question 15
A solution contains 10.0 g of NaCl dissolved in 100 g of water. What is the mole \fraction of NaCl in the solution?
A. 0.036
B. 0.072
C. 0.108
D. 0.144

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