POST UTME CRAWFORD UNIVERSITY 2021 Chemistry | Objective

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Question 1
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. The pH of the solution after the addition of 25.0 mL of NaOH is 9.00. What is the concentration of the NaOH solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 2
A solution contains 15.0 g of glu\cose in 250.0 mL of water. Calculate the molarity of the solution.
A. 0.0500 M
B. 0.0500 M
C. 0.0500 M
D. 0.0500 M
Question 3
A 10.0 mL sample of 0.100 M sulfuric acid is mixed with 20.0 mL of 0.0500 M sodium hydroxide. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 4
A 250 mL sample of a solution contains 0.050 M $\text{CaCl}_2$. What is the number of moles of $\text{Ca}^{2+}$ ions in the solution?
A. 0.005 mol
B. 0.010 mol
C. 0.015 mol
D. 0.020 mol
Question 5
Determine the s\tandard electrode potential for the reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s). Given that the s\tandard electrode potential for Cu2+/Cu is +0.34 V and for Zn2+/Zn is -0.76 V.
A. +0.10 V
B. +0.50 V
C. +0.34 V
D. +0.76 V
Question 6
A 0.500 L flask contains 0.250 mol of CO2 at 298 K. Calculate the partial pressure of CO2 u\sing the ideal gas law.
A. 0.500 atm
B. 0.500 atm
C. 0.500 atm
D. 0.500 atm
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of CH4(g)?
A. -74.8 kJ/mol
B. -74.8 kJ/mol
C. -74.8 kJ/mol
D. -74.8 kJ/mol
Question 8
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.14 M
B. 0.28 M
C. 0.42 M
D. 0.56 M
Question 9
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the pH of the resulting solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 10
A solution contains 25.0 g of NaCl in 250.0 mL of water. Calculate the molarity of the solution.
A. 0.100 M
B. 0.100 M
C. 0.100 M
D. 0.100 M
Question 11
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of 0.100 M HCl?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 12
Determine the number of moles of $\text{Ca}^{2+}$ ions in 250 mL of a solution containing 0.050 M $\text{CaCl}_2$.
A. 0.005 mol
B. 0.010 mol
C. 0.015 mol
D. 0.020 mol
Question 13
A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer has a degree of polymerization of 500, what is the molar mass of the repeating unit?
A. 200 g/mol
B. 400 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 14
A mixture of 2.0 g of sodium hydroxide (NaOH) and 3.0 g of hydrochloric acid (HCl) is prepared. What is the limiting reac\tant?
A. NaOH
B. HCl
C. Neither
D. Both
Question 15
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of 0.100 M HCl?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

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