POST UTME SKYLINE UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. What is the ratio of the final pressure to the initial pressure?
A. 1:1
B. 1:2
C. 2:1
D. 3:1
Question 2
A solution of HCl is titrated with a solution of NaOH. If 25 mL of 0.1 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 3
The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 4
A solution of hydrochloric acid (HCl) is prepared by dissolving 10.0 g of HCl in 100.0 mL of water. Calculate the molarity of the solution.
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 3.0 M
Question 5
A solution of sodium hydroxide (NaOH) is prepared by dissolving 25.0 g of NaOH in 100.0 mL of water. Calculate the molarity of the solution.
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 3.0 M
Question 6
A 1.5 L flask contains 0.3 mol of H2(g) at 25°C. Calculate the pressure of the gas.
A. 0.75 atm
B. 0.75 atm
C. 0.75 atm
D. 0.75 atm
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. -74.8 kJ/mol
D. -283.5 kJ/mol
Question 8
A solution contains 0.1 M NaOH and 0.2 M HCl. What is the pH of the solution after mixing?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 9
A sample of a solid salt, MX2, has a molar mass of 250 g/mol. If 3.75 g of the salt is dissolved in 150 mL of water, what is the concentration of the salt in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.5 M
Question 10
A 2.00 g sample of a metal is heated in a crucible to produce a metal oxide. If the mass of the metal oxide produced is 2.50 g, calculate the percentage increase in mass.
A. 25%
B. 50%
C. 75%
D. 100%
Question 11
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. Calculate the pressure of the gas, given that the ideal gas cons\tant is 0.0821 L atm/mol K.
A. 1.0 atm
B. 1.5 atm
C. 2.0 atm
D. 2.5 atm
Question 12
The atomic radius of an element decreases across a period in the periodic table. Which of the following is a possible reason for this tr\end?
A. Increa\sing electronegativity across a period
B. Decrea\sing atomic number across a period
C. Increa\sing nuclear charge across a period
D. Decrea\sing atomic mass across a period
Question 13
The reaction between sodium hydroxide and hydrochloric acid is a neutralization reaction. What is the products of this reaction?
A. NaCl + H2O
B. NaOH + HCl
C. NaCl + H2O + CO2
D. NaOH + HCl + CO2
Question 14
A 1.5 g sample of a gas is collected over water at a temperature of 20°C and a pressure of 1 atm. If the vapor pressure of water at 20°C is 0.02 atm, what is the partial pressure of the gas?
A. 0.98 atm
B. 0.99 atm
C. 1.00 atm
D. 1.01 atm
Question 15
The rate cons\tant (k) of a reaction is related to the activation energy (Ea) by the equation: k = Ae^\( -Ea/RT \). What is the unit of the rate cons\tant (k) in this equation?
A. mol/Ls
B. mol/Ls^2
C. s^\( -1 \)
D. L/mol/s

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