POST UTME MOUNTAIN TOP UNIVERSITY 2018 Chemistry | Objective

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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
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
Question 3
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 4
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 5
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 6
A 0.5 M solution of H2SO4 is prepared by dissolving 10 g of H2SO4 in 100 mL of water. What is the concentration of the solution in mol/L?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 7
Determine the s\tandard enthalpy of formation of NO(g) from its elements at 298 K.
A. +90.29 kJ/mol
B. -90.29 kJ/mol
C. +120.29 kJ/mol
D. +130.29 kJ/mol
Question 8
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 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 solution of 0.1 M NaCl is prepared by dissolving 6.0 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 12
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 13
A sample of a non-metallic oxide, X2O3, has a mass of 25.0 g and a volume of 2.50 L. If the density of the oxide is 3.50 g/L, what is the molar mass of the oxide?
A. 150 g/mol
B. 200 g/mol
C. 250 g/mol
D. 300 g/mol
Question 14
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 15
A 2.00-L sample of $\text{CO}_2$ gas at 25°C and 1.00 atm is collected over water. What is the partial pressure of $\text{CO}_2$ in the gas mixture?
A. 0.500 atm
B. 0.750 atm
C. 1.00 atm
D. 1.25 atm

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