POST UTME MOUNTAIN TOP UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 2
A metal (X) reacts with oxygen gas to form a white solid. The reaction is as follows: \[ \text{X} + \text{O}_2 \rightarrow \text{X}_2\text{O}_3 \]. If 2.50 g of X reacts with 1.50 g of O2, what is the empirical formula of X2O3?
A. X2O
B. X2O2
C. X2O3
D. X2O4
Question 3
A sample of a non-metallic element has a mass of 25.0 g and a volume of 5.00 cm³. If the density of the element is 2.50 g/cm³, what is the molar mass of the element?
A. 50 g/mol
B. 100 g/mol
C. 150 g/mol
D. 200 g/mol
Question 4
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of 0.100 M NaOH?
A. 0
B. 1
C. 7
D. 14
Question 5
A 1.00 M solution of a strong acid is mixed with 100.0 mL of a 0.100 M solution of a weak base. If the resulting solution has a pH of 4.00, what is the concentration of the weak base?
A. 0.0100 M
B. 0.100 M
C. 1.00 M
D. 10.0 M
Question 6
A solution contains 10% ethanol by volume. If 100 mL of the solution is diluted to 200 mL, what is the concentration of ethanol in the new solution?
A. 5%
B. 10%
C. 15%
D. 20%
Question 7
A 1.00 M solution of a strong acid is mixed with 100.0 mL of a 0.100 M solution of a weak base. If the resulting solution has a pH of 4.00, what is the concentration of the weak base?
A. 0.0100 M
B. 0.100 M
C. 1.00 M
D. 10.0 M
Question 8
A 2.00 g sample of a non-metallic element is heated in a crucible until it reaches a temperature of 1000°C. If the element has a specific heat capacity of 0.500 J/g°C, what is the energy required to heat the element to 1000°C?
A. 400 J
B. 600 J
C. 800 J
D. 1000 J
Question 9
A redox reaction involves the oxidation of Cu(s) to Cu2+(aq) and the reduction of Fe3+(aq) to Fe2+(aq). What is the s\tandard cell potential (Ecell) for this reaction?
A. 0.5 V
B. 1.0 V
C. 1.5 V
D. 2.0 V
Question 10
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the concentration of HCl after the addition of 50.0 mL of 0.100 M NaOH?
A. 0.050 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 11
A 2.0 M solution of HCl is titrated with a 2.0 M solution of NaOH. What is the pH of the resulting solution after 20 mL of NaOH has been added?
A. 2
B. 3
C. 4
D. 5
Question 12
A sample of a gas at 100°C and 1 atm is cooled to 0°C at cons\tant pressure. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 13
A 2.00 L flask contains 0.100 mol of a non-ideal gas at 298 K. The gas is heated to 373 K and the volume is increased to 3.00 L. What is the new pressure of the gas?
A. 1.00 atm
B. 2.00 atm
C. 3.00 atm
D. 4.00 atm
Question 14
A solution contains 2.0 g of NaCl 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 15
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution after 25.0 mL of NaOH has been added.
A. 2.00
B. 3.00
C. 4.00
D. 5.00

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