POST UTME OSUSTECH 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas?
A. 1/2 V
B. 1/3 V
C. 2/3 V
D. V
Question 2
The following diagram shows a titration setup. Identify the subs\tance being titrated.
A. HCl
B. NaOH
C. H2SO4
D. NaCl
Question 3
A 2.5 M solution of HCl is prepared by dissolving 12.5 g of HCl in 1 L of water. Calculate the pH of the solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 4
A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in 1 L of water. Calculate the molarity of the solution.
A. 2.5 M
B. 2.5 M
C. 5.0 M
D. 10.0 M
Question 5
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. If 25.0 mL of 0.100 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 6
The boiling point of a solution containing 10 g of glu\cose in 100 g of water is 100.5°C. Calculate the molality of the solution.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 7
A 0.500 M solution of NaOH is mixed with 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
A polymer chain consists of 100 monomers, each with a molecular weight of 100 g/mol. If the polymer chain has a degree of polymerization of 50, what is the number-average molecular weight of the polymer?
A. 100 g/mol
B. 200 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 9
A 2.5 L flask contains 0.2 mol of CO2 at 25°C. If 0.1 mol of O2 is added to the flask, what is the new partial pressure of CO2?
A. 0.2 atm
B. 0.3 atm
C. 0.4 atm
D. 0.5 atm
Question 10
A 0.1 M solution of FeCl3 is mixed with a 0.1 M solution of NaOH. If the initial temperature of both solutions is 25°C, what is the final temperature of the mixture after complete reaction?
A. 25°C
B. 30°C
C. 35°C
D. 40°C
Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1781.8 kJ/mol
B. -1781.9 kJ/mol
C. -1781.7 kJ/mol
D. -1781.6 kJ/mol
Question 12
A 2.00 g sample of an unknown hydrocarbon is burned in a combustion reaction. The products are 2.00 g of CO2 and 1.00 g of H2O. Calculate the empirical formula of the hydrocarbon.
A. CH2
B. C2H4
C. C3H6
D. C4H8
Question 13
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 2.5 g of C(s) at 298 K.
A. -275.625 kJ
B. -275.75 kJ
C. -275.875 kJ
D. -276.0 kJ
Question 14
The diagram below shows the periodic table. Which element is a noble gas?
A. He
B. Ne
C. Ar
D. Kr
Question 15
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the s\tandard cell potential (E°cell) for this reaction at 25°C?
A. -0.34 V
B. 0.34 V
C. 1.10 V
D. 2.30 V

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