POST UTME LASU 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of sodium chloride is prepared by dissolving 35.5 g of sodium chloride in 100 mL of water. What is the molarity of the solution?
A. 0.6
B. 0.7
C. 0.8
D. 0.9
Question 2
The diagram below shows a titration setup. What is the purpose of the burette?
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 measure the pH of the solution
Question 3
A solution contains 0.1 M NaCl. Calculate the concentration of Cl- ions in the solution.
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 4
A metal is extracted from its ore u\sing the following process: Roasting → Leaching → Purification. What is the purpose of the roasting step?
A. To convert the ore into a soluble compound
B. To remove impurities from the ore
C. To increase the surface area of the ore
D. To reduce the temperature of the ore
Question 5
A solution contains 10 g of NaCl. If 50 mL of water is added, what is the new concentration in g/L?
A. 0.2 g/L
B. 0.5 g/L
C. 1 g/L
D. 2 g/L
Question 6
A non-metal is formed by the reaction between a metal and a non-metal. If the metal has an atomic mass of 24 g/mol and the non-metal has an atomic mass of 32 g/mol, what is the empirical formula of the non-metal?
A. C
B. N
C. O
D. S
Question 7
A diagram of a titration setup is shown below.
A. The burette contains the analyte
B. The burette contains the titrant
C. The beaker contains the analyte
D. The beaker contains the titrant
Question 8
A polymer is formed by the condensation reaction between a diol and a diacid. If the molecular weight of the diol is 180 g/mol and the molecular weight of the diacid is 150 g/mol, what is the molecular weight of the polymer formed?
A. 390
B. 420
C. 450
D. 480
Question 9
A diagram of a redox reaction is shown below.
A. Oxidation occurs at A
B. Reduction occurs at A
C. Oxidation occurs at B
D. Reduction occurs at B
Question 10
A 0.1 M solution of hydrochloric acid is prepared by dissolving 3.0 g of hydrochloric acid in 100 mL of water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 11
A 1.0 M solution of potassium chloride (KCl) is electrolyzed at a cons\tant current of 1.0 A for 10 minutes. Determine the mass of potassium chloride deposited at the cathode.
A. 0.1 g
B. 0.2 g
C. 0.3 g
D. 0.4 g
Question 12
A 10 L \tank contains 5 g of CO2 at 300 K. If the \tank is heated to 400 K, what is the new pressure in atm?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 13
A 2.5 M solution of HCl is mixed with a 1.5 M solution of NaOH. What is the concentration of the resulting solution?
A. 1.5 M
B. 2.0 M
C. 2.5 M
D. 3.0 M
Question 14
The reaction of cyclohexane with bromine in the presence of light results in the formation of a cyclic bromohydrocarbon. What is the major product of this reaction?
A. 1-bromocyclohexane
B. trans-1,2-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. cyclohexene
Question 15
A 10 mL sample of a solution contains 0.5 g of glu\cose. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

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