POST UTME REDEEMERS UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.100 M NH3 and 0.100 M HCl. What is the concentration of NH4Cl in the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 2
Determine the number of moles of electrons transferred in the electrolysis of 1.5 L of 0.25 M H2SO4.
A. 1.5 mol
B. 0.375 mol
C. 0.75 mol
D. 3 mol
Question 3
A 2.00 g sample of a polymer is dissolved in 100.0 mL of water. What is the concentration of the solution in g/L?
A. 2.00 g/L
B. 4.00 g/L
C. 6.00 g/L
D. 8.00 g/L
Question 4
A 0.5 M solution of a strong acid is prepared by dissolving 25 g of the acid in water to make 1 L of solution. What is the molar mass of the acid?
A. 50 g/mol
B. 100 g/mol
C. 200 g/mol
D. 500 g/mol
Question 5
A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MX2. If 2.5 g of M reacts with 2.5 g of Cl2, what is the percentage yield of MX2 if the theoretical yield is 5 g?
A. 50%
B. 75%
C. 90%
D. 95%
Question 6
A 0.5 M solution of NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 25 mL of HCl has been added.
A. 2
B. 3
C. 4
D. 5
Question 7
A 2.50-g sample of a hydrocarbon is burned in excess oxygen to produce 3.75 L of CO2 at 25°C and 1.00 atm. What is the empirical formula of the hydrocarbon?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 8
A 2.50-g sample of a hydrocarbon is burned in excess oxygen to produce 3.75 L of CO2 at 25°C and 1.00 atm. What is the empirical formula of the hydrocarbon?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Question 9
A metal M has a density of 9.5 g/cm3 and an atomic mass of 65.5 g/mol. What is the volume of 1.5 mol of M in cm3?
A. 0.15 cm3
B. 0.30 cm3
C. 0.45 cm3
D. 0.60 cm3
Question 10
A solution of sodium chloride (NaCl) is electrolyzed u\sing a current of 5.0 A for 2.0 hours. Calculate the mass of chlorine gas produced at the anode.
A. 10 g
B. 20 g
C. 30 g
D. 40 g
Question 11
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Cylinder
Question 12
A metal (X) has a s\tandard electrode potential of +0.80 V. What is the s\tandard electrode potential of the metal (Y) that is reduced at the same rate as X?
A. +0.60 V
B. +0.80 V
C. +1.00 V
D. +1.20 V
Question 13
A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. If 1.2 g of the oxide is left after heating, what is the percentage of the oxide that decomposed?
A. 20%
B. 30%
C. 40%
D. 50%
Question 14
A sample of a polymer has a molecular weight of 100,000 g/mol. Calculate the number of monomer units in the polymer.
A. 100
B. 1000
C. 10,000
D. 100,000
Question 15
Determine the molar solubility of AgCl in 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^\( -10 \).
A. 1.0 × 10^\( -5 \) M
B. 1.0 × 10^\( -6 \) M
C. 1.0 × 10^\( -7 \) M
D. 1.0 × 10^\( -8 \) M

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