POST UTME SUMMIT UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.5 M solution of sodium hydroxide (NaOH) is mixed with a 0.5 M solution of hydrochloric acid (HCl). What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 2
The reaction between nitrogen and oxygen to form nitrogen dioxide is highly exothermic. Calculate the s\tandard enthalpy change for the reaction: N2(g) + O2(g) → 2NO2(g). The s\tandard enthalpy of formation of NO2(g) is -179 kJ/mol.
A. -179 kJ/mol
B. -279 kJ/mol
C. -379 kJ/mol
D. -479 kJ/mol
Question 3
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 4
A 20.0 mL sample of a hydrochloric acid solution is titrated with 0.0500 M sodium hydroxide solution. If 25.0 mL of the base is required to reach the equivalence point, calculate the concentration of the acid.
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 5
A 0.500 M solution of HCl is mixed with 100.0 mL of 0.200 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 6
The solubility of AgCl in water is 1.2 x 10^\( -5 \) M. Calculate the molar solubility of AgCl in a 0.1 M solution of NaCl.
A. 1.2 x 10^\( -5 \)
B. 1.2 x 10^\( -4 \)
C. 1.2 x 10^\( -3 \)
D. 1.2 x 10^\( -2 \)
Question 7
A 2.5 L flask contains 0.5 mol of an ideal gas at 300 K. Calculate the number of molecules of the gas u\sing the ideal gas law.
A. 1.5 × 10^22
B. 1.8 × 10^22
C. 2.0 × 10^22
D. 2.5 × 10^22
Question 8
A 0.500 L sample of a gas at 25°C and 1.00 atm is allowed to expand to 1.50 L at cons\tant temperature. Calculate the work done by the gas.
A. -0.750 L atm
B. -0.500 L atm
C. -1.00 L atm
D. -1.50 L atm
Question 9
A solution contains 2.5 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 10
A 0.500 L sample of a gas at 25°C and 1.00 atm is allowed to expand to 1.50 L at cons\tant temperature. Calculate the work done by the gas.
A. -0.750 L atm
B. -0.500 L atm
C. -1.00 L atm
D. -1.50 L atm
Question 11
A solution contains 5.00 g of potassium nitrate (KNO3) dissolved in 100.0 mL of water. Calculate the molarity of the solution.
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M
Question 12
A mixture of 10 mL of 0.1 M HCl and 20 mL of 0.2 M NaOH is titrated with 0.1 M HCl. What is the volume of HCl required to reach the equivalence point?
A. 20 mL
B. 30 mL
C. 40 mL
D. 50 mL
Question 13
A 2.5 L flask contains 0.5 mol of an ideal gas at 300 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.2 atm
B. 1.5 atm
C. 2.0 atm
D. 2.5 atm
Question 14
A solution containing 0.1 M HCl and 0.1 M NaOH is mixed with a solution containing 0.1 M H2SO4 and 0.1 M NaOH. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 15
A sample of a polymer has a molecular weight of 100,000 g/mol. If 2.5 g of the polymer is dissolved in 50 mL of solvent, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.10 g/L
C. 0.20 g/L
D. 0.50 g/L

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