POST UTME SUMMIT UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A solution contains 0.1 M NaCl and 0.2 M NaOH. Calculate the pH of the solution.
A. 12.1
B. 12.1
C. 12.1
D. 12.1
Question 3
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 4
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 5
A solution contains 3.00 g of calcium chloride (CaCl2) 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 6
A sample of nitrogen gas is collected over water at a temperature of 298 K and a pressure of 1.00 atm. Calculate the partial pressure of nitrogen gas in the sample.
A. 0.80 atm
B. 0.90 atm
C. 1.00 atm
D. 1.10 atm
Question 7
A 2.5 L flask contains 0.25 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^5 Pa
B. 1.01 x 10^5 Pa
C. 1.01 x 10^5 Pa
D. 1.01 x 10^5 Pa
Question 8
A metal (X) reacts with chlorine gas to form a white solid. The reaction is highly exothermic and releases 35.5 kJ of heat per mole of X. If 2.5 moles of X are reacted, how much heat is released?
A. 87.5 kJ
B. 87.8 kJ
C. 88.0 kJ
D. 88.5 kJ
Question 9
A solution contains 2.5 g of NaCl in 100 mL of water. What is the molality of the solution?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 10
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 11
A 2.5 M solution of HCl is mixed with a 1.0 M solution of NaOH. Calculate the concentration of the resulting solution after the reaction is complete.
A. 1.75 M
B. 2.25 M
C. 2.5 M
D. 3.0 M
Question 12
A solution contains 1.0 g of glu\cose in 100 mL of water. What is the concentration of the solution in g/L?
A. 10 g/L
B. 20 g/L
C. 30 g/L
D. 40 g/L
Question 13
A mixture of 20 mL of 0.2 M HCl and 10 mL of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 14
A solution contains 2.5 g of NaCl in 100 mL of water. What is the molar concentration of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 15
A 25 mL sample of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 10 mL of HCl has been added.
A. 1
B. 2
C. 3
D. 4

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