POST UTME UI 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a gas law setup is shown below. If the pressure is increased from 1 atm to 2 atm, what is the new volume of the gas?
A. 1
B. 2
C. 3
D. 4
Question 2
A 2.0 M solution of sulfuric acid (H2SO4) is mixed with a 2.0 M solution of sodium hydroxide (NaOH). What is the resulting concentration of the acid-base reaction?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 3
A 2.50 g sample of a metal carbonate is heated to produce a 1.25 g sample of the metal oxide. What is the molar mass of the metal carbonate?
A. 100 g/mol
B. 120 g/mol
C. 140 g/mol
D. 160 g/mol
Question 4
A sample of nitrogen gas at 25°C and 1 atm is mixed with a sample of oxygen gas at 25°C and 1 atm. What is the partial pressure of oxygen in the resulting mixture?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.25 atm
Question 5
A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. The solution is then titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the molar mass of the subs\tance?
A. 100
B. 200
C. 300
D. 400
Question 6
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
D. 4
Question 7
A 10.0 mL sample of a 0.100 M solution of NaOH is mixed with a 10.0 mL sample of a 0.100 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 8.50
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1206.5 kJ/mol
B. -1206.0 kJ/mol
C. -1207.0 kJ/mol
D. -1208.0 kJ/mol
Question 9
A 5.00 g sample of a metal is heated in a stream of oxygen gas to produce a 2.50 g sample of the metal oxide. What is the molar mass of the metal?
A. 20 g/mol
B. 40 g/mol
C. 60 g/mol
D. 80 g/mol
Question 10
A 100-g sample of a non-metallic compound is found to have a mass of 25 g when heated in a vacuum. What is the molar mass of the compound?
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 11
A 10.0 mL sample of a 0.100 M solution of HCl is mixed with a 10.0 mL sample of a 0.100 M solution of NaOH. What is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 8.50
Question 12
Determine the molar mass of a polymer with the following monomer units: CH2=CH-CH3, CH2=CH-CH2-CH3, and CH2=CH-CH2-CH2-CH3. Assume the polymer has a degree of polymerization of 100.
A. 500 g/mol
B. 750 g/mol
C. 1000 g/mol
D. 1250 g/mol
Question 13
A 1.00 M solution of H2SO4 is mixed with 1.00 M solution of NaOH. What is the resulting pH?
A. 0.00
B. 1.00
C. 2.00
D. 3.00
Question 14
A 10.0 mL sample of a 0.100 M solution of NaOH is mixed with a 10.0 mL sample of a 0.100 M solution of HCl. What is the molarity of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 15
A 0.500 M solution of HCl is mixed with 0.500 M solution of NaOH. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

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