POST UTME UNILAG 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The half-life of a radioactive subs\tance is 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 20 Bq
B. 40 Bq
C. 50 Bq
D. 80 Bq
Question 2
A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 10 mL
B. 20 mL
C. 25 mL
D. 30 mL
Question 3
The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO?
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. 110.5 kJ/mol
D. 393.5 kJ/mol
Question 4
A metal rod of length 20 cm and radius 1 cm is heated from 20°C to 100°C. Calculate the increase in length.
A. 0.1 cm
B. 0.2 cm
C. 0.3 cm
D. 0.4 cm
Question 5
The reaction of cyclohexane with bromine in the presence of light yields a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane
Question 6
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the resulting pH of the solution?
A. 7
B. 8
C. 9
D. 10
Question 7
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. What is the volume of the gas at 50°C and 2 atm?
A. 1.25 L
B. 2.5 L
C. 5 L
D. 10 L
Question 8
A 2 M solution of H2SO4 is mixed with a 2 M solution of NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 9
The reaction of sodium with water produces hydrogen gas and sodium hydroxide. What is the balanced chemical equation for this reaction?
A. \( 2Na + 2H_2O \rightarrow 2NaOH + H_2 \)
B. \( 2Na + H_2O \rightarrow NaOH + H_2 \)
C. \( Na + 2H_2O \rightarrow NaOH + H_2 \)
D. \( Na + H_2O \rightarrow NaOH + H_2 \)
Question 10
Determine the pH of a 0.1 M solution of HCl if 25 mL of 0.1 M NaOH is added to 50 mL of the HCl solution.
A. 1
B. 2
C. 3
D. 4

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