POST UTME CALEB UNIVERSITY 2020 Chemistry | Objective
Practice these randomly selected questions to test your readiness.
Question 1
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1.0 mol of C(s) to form CO2(g)?
Question 2
The rate cons\tant for 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 after 10 minutes?
Question 3
The rate of diffusion of a gas in a liquid is given by ______ equation.
Question 4
A 2.50 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
Question 5
A 1.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 100 mL of water. What is the concentration of OH- ions in the solution?
Question 6
The atomic radius of an element is 100 pm. If the element has an atomic number of 20, what is the value of the electron configuration?
Question 7
A catalyst is added to a reaction mixture containing 1 M H2 and 1 M I2. The reaction is first-order with respect to H2 and second-order with respect to I2. If the initial rate of reaction is 0.1 M/s, what is the rate of reaction after 10 minutes?
Question 8
The diagram below shows a titration setup. Identify the part labeled A.
Question 9
A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in 1 L of water. What is the concentration of OH- ions in the solution?
Question 10
The polymerization of styrene to form polystyrene is an example of a ______ reaction.
Question 11
At 25°C, the equilibrium cons\tant (Kp) for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) is 0.036. Calculate the partial pressure of NH3(g) when the partial pressures of N2(g) and H2(g) are 0.15 atm and 0.45 atm, respectively.
Question 12
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 25 mL of HCl is required to reach the equivalence point, calculate the volume of NaOH required to reach the equivalence point.
Question 13
A metal (X) reacts with dilute HCl to produce a gas that gives a brown ring test with ammonia. Identify the metal.
Question 14
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.5 mol of C6H12O6(s) at 298 K.
Question 15
The s\tandard Gibbs free energy of formation of a compound is -50.5 kJ/mol at 298 K. What is the equilibrium cons\tant (K) for the reaction at the same temperature?
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