POST UTME RSU 2025 Chemistry | Objective

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Question 1
A 2.0 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. The amount of CO2 produced is 1.2 g and the amount of H2O produced is 0.8 g. What is the molar mass of the compound?
A. 30 g/mol
B. 60 g/mol
C. 90 g/mol
D. 120 g/mol
Question 2
A 2.0 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. The amount of CO2 produced is 1.2 g and the amount of H2O produced is 0.8 g. What is the empirical formula of the compound?
A. CH2
B. C2H4
C. C3H6
D. C4H8
Question 3
A solution contains 2.5 g of NaCl per 100 mL of solution. What is the molarity of the solution?
A. 0.25 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 4
The diagram below shows a setup for the extraction of a metal from its ore. Identify the purpose of the beaker labeled B.
A. To dissolve the metal oxide
B. To dissolve the metal oxide
C. To dissolve the metal oxide
D. To dissolve the metal oxide
Question 5
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 20 mL of the acid is required to reach the equivalence point, what is the number of moles of NaOH used?
Question 6
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of Cl- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 7
Determine 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. -1871.9 kJ/mol
B. -1675.7 kJ/mol
C. -824.2 kJ/mol
D. -1871.9 kJ/mol
Question 8
A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?
A. 2
B. 1
C. 4
D. 3
Question 9
A 2.5 M solution of sulfuric acid (H2SO4) is prepared by dissolving 2.5 g of H2SO4 in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.025 g/L
B. 0.25 g/L
C. 2.5 g/L
D. 25 g/L
Question 10
A sample of an organic compound has the molecular formula C6H12O6. What is the type of bond present in the compound?
A. Single bond
B. Double bond
C. Triple bond
D. Hydrogen bond
Question 11
A sample of 2.0 g of a hydrocarbon is burned in a combustion apparatus. The volume of CO2 produced is 2.5 L at STP. What is the empirical formula of the hydrocarbon?
A. CH4
B. C2H6
C. C3H8
D. C4H10
Question 12
A 0.1 M solution of NaOH is prepared by dissolving 2.0 g of NaOH in 100 mL of water. What is the concentration of the solution in g/L?
A. 2.0 g/L
B. 20 g/L
C. 200 g/L
D. 2000 g/L
Question 13
Determine the number of moles of oxygen gas (O2) produced when 2.5 moles of hydrogen peroxide (H2O2) decompose according to the equation: 2H2O2(l) → 2H2O(l) + O2(g).
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 14
What is the molar mass of a subs\tance that has a density of 2.5 g/mL and a volume of 5.0 mL?
A. 12.5 g/mol
B. 25.0 g/mol
C. 50.0 g/mol
D. 100 g/mol
Question 15
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. The reaction is CaO(s) + CO2(g) → CaCO3(s).
A. -1781.60 kJ/mol
B. -1781.60 kJ/mol
C. -1781.60 kJ/mol
D. -1781.60 kJ/mol

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