POST UTME REDEEMERS UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100.0 mL sample of a 0.10 M solution of glu\cose is titrated with 0.10 M HCl. What is the pH of the solution after the titration?
A. 6.0
B. 7.0
C. 8.0
D. 9.0
Question 2
A 0.100 M solution of NaOH is titrated with 0.100 M HCl. If 25.0 mL of HCl is required to reach the equivalence point, what is the number of moles of NaOH present in the original solution?
A. 0.00250 mol
B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol
Question 3
A 2.5 M solution of hydrochloric acid (HCl) is mixed with a 2.5 M solution of sodium hydroxide (NaOH). Calculate the concentration of the resulting solution.
A. 2.5 M
B. 5.0 M
C. 2.5 M
D. 5.0 M
Question 4
The diagram below shows a titration setup for the reaction of sodium hydroxide with hydrochloric acid. What is the purpose of the burette in this setup?
A. to measure the volume of acid added
B. to measure the volume of base added
C. to mix the acid and base
D. to separate the acid and base
Question 5
A 25.0-mL sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the titration is complete?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 6
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 15.0 mL of NaOH has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 7
A 2.0 g sample of a polymer is dissolved in 100 mL of solvent. What is the concentration of the polymer in g/L?
A. 20 g/L
B. 40 g/L
C. 60 g/L
D. 80 g/L
Question 8
The reaction of cyclohexane with bromine in the presence of light produces 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-1,2-dibromocyclohexane
Question 9
A polymer, P, has a molecular weight of 100,000 g/mol. If 1 g of P is dissolved in 100 mL of water, calculate the concentration of P in g/L.
A. 1 g/L
B. 10 g/L
C. 100 g/L
D. 1000 g/L
Question 10
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -824.2 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and the s\tandard enthalpy of formation for Fe(s) is 0 kJ/mol.
A. -1821.9 kJ/mol
B. -1821.9 kJ/mol
C. -1821.9 kJ/mol
D. -1821.9 kJ/mol
Question 11
A 2.0 M solution of sodium carbonate (Na2CO3) is mixed with a 2.0 M solution of hydrochloric acid (HCl). Calculate the concentration of the resulting solution.
A. 2.0 M
B. 4.0 M
C. 2.0 M
D. 4.0 M
Question 12
The rate cons\tant (k) for a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 120 kJ/mol, the gas cons\tant (R) is 8.314 J/\( mol*K \), and the temperature (T) is 300 K, what is the value of the rate cons\tant (k) if the pre-exponential factor (A) is 1.0 x 10^10 s^\( -1 \)?
A. 1.0 x 10^\( -5 \) s^\( -1 \)
B. 1.0 x 10^\( -4 \) s^\( -1 \)
C. 1.0 x 10^\( -3 \) s^\( -1 \)
D. 1.0 x 10^\( -2 \) s^\( -1 \)
Question 13
A 50.0 mL sample of 0.100 M H2SO4 is titrated with 0.100 M NaOH. Calculate the pH of the solution after 20.0 mL of NaOH has been added.
A. 1.00
B. 1.50
C. 2.00
D. 2.50
Question 14
A 10.0 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 42.0 kJ of heat. If the molar mass of the hydrocarbon is 84.0 g/mol, what is its enthalpy of combustion?
A. -500 kJ/mol
B. -500 kJ/mol
C. -500 kJ/mol
D. -500 kJ/mol
Question 15
Determine the empirical formula of a compound containing 40.0 g of carbon, 6.0 g of hydrogen, and 54.0 g of oxygen.
A. CH2O
B. C2H4O2
C. C3H6O3
D. C4H8O4

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