POST UTME UNIOSUN 2019 Chemistry | Objective

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Question 1
A polymer has a molecular weight of 10000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 50 g/mol
B. 100 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 2
A metal oxide, M2O3, has a molar mass of 228 g/mol. If 2.50 g of the oxide is dissolved in 50.0 mL of 0.100 M HCl, what is the concentration of the metal ion in the resulting solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 3
The reaction between sodium metal and water is represented by the equation: 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g). Calculate the number of moles of hydrogen gas produced when 2 g of sodium metal reacts with excess water.
A. 0.025 mol
B. 0.030 mol
C. 0.035 mol
D. 0.040 mol
Question 4
A metal, M, has a molar mass of 50.0 g/mol. If 2.00 g of the metal is dissolved in 50.0 mL of 0.100 M HCl, what is the concentration of the metal ion in the resulting solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 5
A solution contains 0.100 M KNO3. If 50.0 mL of this solution is mixed with 50.0 mL of 0.100 M NaOH, what is the resulting pH?
A. 8.00
B. 9.00
C. 10.0
D. 11.0
Question 6
A polymer has a molecular weight of 5000 g/mol and a degree of polymerization of 100. What is the molar mass of the repeating unit?
A. 50 g/mol
B. 100 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 7
A solution contains 10.0 g of glu\cose. What is the molarity of the solution, assuming a density of 1.0 g/mL?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 8
A metal M has an electron configuration of [Ar] 3d^5 4s^2. Which of the following is a possible oxidation state for M?
A. +2
B. +3
C. +4
D. +5
Question 9
The diagram below shows a chemical apparatus setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical flask
D. Test tube
Question 10
A 0.100 M solution of HCl is titrated with 0.100 M NaOH. If 25.0 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100 mL
Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 2.5 g of carbon at 298 K.
A. -981.25 kJ
B. -981.375 kJ
C. -981.5 kJ
D. -981.625 kJ
Question 12
A metal has an atomic radius of 200 pm. What is the expected atomic radius of the metal's ion, assuming it loses 2 electrons?
A. 150 pm
B. 175 pm
C. 200 pm
D. 225 pm
Question 13
The reaction between zinc metal and copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). Calculate the number of moles of copper metal deposited when 2.5 g of zinc metal reacts with excess copper(II) sulfate solution. The molar mass of zinc is 65.38 g/mol, and the molar mass of copper is 63.55 g/mol.
A. 0.038 mol
B. 0.039 mol
C. 0.040 mol
D. 0.041 mol
Question 14
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the resulting pH?
A. 7
B. 10
C. 12
D. 14
Question 15
A metal, M, has a molar mass of 50.0 g/mol. If 2.00 g of the metal is dissolved in 50.0 mL of 0.100 M HCl, what is the concentration of the metal ion in the resulting solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M

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