POST UTME MOUNTAIN TOP UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 5.00-g sample of $\text{Na}_2\text{O}_2$ is dissolved in 100.0 mL of water. What is the concentration of the resulting solution in $\text{mol}/\text{L}$?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 2
Determine the number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaC}_2$ is heated in the presence of excess $\text{O}_2$.
A. 0.0500 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 3
A 2.00-L sample of $\text{H}_2$ gas at 25°C and 1.00 atm is collected over water. What is the partial pressure of $\text{H}_2$ in the gas mixture?
A. 0.500 atm
B. 0.750 atm
C. 1.00 atm
D. 1.25 atm
Question 4
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the resulting concentration of the common ion after the reaction is complete?
A. 0.000 M
B. 0.250 M
C. 0.500 M
D. 1.00 M
Question 5
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of KOH. What is the resulting concentration of the common ion after the reaction is complete?
A. 0.000 M
B. 0.500 M
C. 1.00 M
D. 2.00 M
Question 6
A 2.0 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. What is the concentration of the solution in mol/L?
A. 2.0 M
B. 4.0 M
C. 6.0 M
D. 8.0 M
Question 7
A 1.00 L sample of a gas, X, is collected over water at a temperature of 25°C and a pressure of 1.00 atm. If the vapor pressure of water at this temperature is 0.0313 atm, what is the partial pressure of the gas?
A. 0.9687 atm
B. 0.9697 atm
C. 0.9707 atm
D. 0.9717 atm
Question 8
A sample of $\text{C}_6\text{H}_{12}\text{O}_6$ has a molar mass of 180 g/mol. What is the empirical formula of the compound?
A. $\text{C}_2\text{H}_4\text{O}_2$
B. $\text{C}_3\text{H}_6\text{O}_3$
C. $\text{C}_4\text{H}_8\text{O}_4$
D. $\text{C}_6\text{H}_{12}\text{O}_6$
Question 9
A 1.00 L sample of a gas, X, is collected over water at a temperature of 25°C and a pressure of 1.00 atm. If the vapor pressure of water at this temperature is 0.0313 atm, what is the partial pressure of the gas?
A. 0.9687 atm
B. 0.9697 atm
C. 0.9707 atm
D. 0.9717 atm
Question 10
A 2.00 g sample of a metal, M, is dissolved in 100.0 mL of a 1.00 M solution of HCl. The resulting solution has a pH of 1.5. What is the value of the metal's reduction potential E?
A. -0.50 V
B. -0.75 V
C. -1.00 V
D. -1.25 V
Question 11
A 1.0 M solution of NaOH is prepared by dissolving 20 g of NaOH in 100 mL of water. What is the concentration of the solution in mol/L?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 12
A 1.5 M solution of Na2CO3 is prepared by dissolving 30 g of Na2CO3 in 100 mL of water. What is the concentration of the solution in mol/L?
A. 1.5 M
B. 2.0 M
C. 2.5 M
D. 3.0 M
Question 13
A 2.00 g sample of a metal, M, is dissolved in 100.0 mL of a 1.00 M solution of HCl. The resulting solution has a pH of 1.5. What is the value of the metal's reduction potential E?
A. -0.50 V
B. -0.75 V
C. -1.00 V
D. -1.25 V
Question 14
A 1.0 M solution of NaOH is prepared by dissolving 20 g of NaOH in 100 mL of water. What is the concentration of the solution in mol/L?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 15
A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. What is the resulting concentration of the common ion after the reaction is complete?
A. 0.000 M
B. 0.250 M
C. 0.500 M
D. 1.00 M

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