POST UTME UI 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a non-metallic element has a mass of 25.0 g and a density of 3.50 g/cm³. What is the volume of the sample?
A. 1.43 cm³
B. 2.14 cm³
C. 3.50 cm³
D. 5.00 cm³
Question 2
A mixture of 2.0 g of NaCl and 3.0 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 3
A 2.00 L flask contains 0.500 mol of CO2. What is the partial pressure of CO2 in the flask?
A. 0.120 atm
B. 0.150 atm
C. 0.180 atm
D. 0.200 atm
Question 4
The enthalpy change (ΔH) for the combustion of methane (CH4) is -890 kJ/mol. If 2.5 mol of methane is burned, what is the total enthalpy change for this reaction?
A. -2225 kJ
B. -2220 kJ
C. -2215 kJ
D. -2210 kJ
Question 5
A mixture of $H_2O$ and $C_6H_6$ is separated by \fractional distillation. If the boiling point of $H_2O$ is $100^\circ C$ and the boiling point of $C_6H_6$ is $80.1^\circ C$, what is the minimum number of plates required to separate the mixture?
A. 2
B. 3
C. 4
D. 5
Question 6
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 7
The atomic radius of a certain metal, M, is 0.125 nm. If the atomic radius of M is 0.125 nm, what is the atomic radius of M2+?
A. 0.0625 nm
B. 0.125 nm
C. 0.1875 nm
D. 0.250 nm
Question 8
A 1.00 L flask contains 0.100 mol of NaCl. What is the concentration of Na+ ions in the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 9
A solution of $NaOH$ is prepared by dissolving $20.0,g$ of $NaOH$ in $100,mL$ of water. If the density of the solution is $1.05,g/mL$, calculate the molarity of the solution.
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 10
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, ΔHf(C(s)) = 0 kJ/mol.
A. -1206.60 kJ/mol
B. -1206.10 kJ/mol
C. -1207.10 kJ/mol
D. -1207.60 kJ/mol
Question 11
A 2.50-g sample of a non-metallic element, X, reacts with oxygen to form 3.25 g of X2O3. Calculate the empirical formula of X.
A. X2O3
B. XO2
C. X2O5
D. XO3
Question 12
A 1.00 L flask contains 0.100 mol of NaCl. What is the concentration of Na+ ions in the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 13
Determine the number of moles of ΔH₂O(g) produced when 2.50 g of H₂(g) reacts with O₂(g) according to the equation: 2H₂(g) + O₂(g) → 2ΔH₂O(g).
A. 0.0500 mol
B. 0.100 mol
C. 0.200 mol
D. 0.500 mol
Question 14
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 1.0 L of water. What is the concentration of the solution in terms of molality?
A. 0.1 mol/kg
B. 0.2 mol/kg
C. 0.3 mol/kg
D. 0.4 mol/kg
Question 15
A 2.0 M solution of NH3 is titrated with 1.0 M HCl. What is the pH of the solution after 20 mL of HCl has been added?
A. 1.0
B. 2.0
C. 3.0
D. 4.0

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