POST UTME NOUN 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between chlorine gas and potassium iodide is a classic example of a redox reaction. What is the oxidation state of iodine in KI?
A. 0
B. -1
C. +1
D. +2
Question 2
A sample of copper metal is electrolyzed in a solution of CuSO4. Calculate the mass of copper deposited after 2 hours if the current is 5 A and the density of copper is 8.96 g/cm^3.
A. 10 g
B. 20 g
C. 30 g
D. 40 g
Question 3
A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH after 10 mL of NaOH has been added.
A. 2
B. 3
C. 4
D. 5
Question 4
A 1 M solution of NaOH is titrated with 1 M HCl. Calculate the pH after 20 mL of HCl has been added.
A. 2
B. 3
C. 4
D. 5
Question 5
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 1-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
C. 1-chloro-2-methylbu\tane
D. 2-chloro-2-methylbu\tane
Question 6
A 1.0 L flask contains 0.5 mol of a gas at 50°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 2.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 2.01 × 10^5 Pa
D. 2.01 × 10^5 Pa
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) from the following reaction: CO2(g) → CO(g) + 1/2O2(g).
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 8
A metal M has a s\tandard electrode potential of +0.5 V. Calculate the s\tandard Gibbs free energy change for the reaction M → M^2+ + 2e^-.
A. -0.5 kJ/mol
B. -1 kJ/mol
C. -2 kJ/mol
D. -3 kJ/mol
Question 9
A sample of a metal oxide is heated in a crucible to produce a gas. The gas is collected over water and found to have a volume of 2.5 L at 25°C and 1 atm. Calculate the molar mass of the gas.
A. 20 g/mol
B. 30 g/mol
C. 40 g/mol
D. 50 g/mol
Question 10
The diagram below shows a molecular structure. What is the shape of this molecule?
A. Linear
B. Trigonal Planar
C. Tetrahedral
D. Bent
Question 11
The half-life of a radioactive subs\tance is 10 years. If the initial activity is 1000 Bq, what is the activity after 20 years?
A. 500 Bq
B. 1000 Bq
C. 2000 Bq
D. 5000 Bq
Question 12
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. The resulting solution is then titrated with 0.1 M H2SO4. Calculate the pH of the resulting solution at the equivalence point.
A. 7
B. 8
C. 9
D. 10
Question 13
The reaction between potassium permanganate and oxalic acid is a classic example of an oxidation-reduction reaction. What is the products of this reaction?
A. KMnO4 and H2C2O4
B. K2C2O4 and MnO2
C. K2C2O4 and MnSO4
D. KMnO4 and MnSO4
Question 14
A sample of a metal oxide is heated in a crucible to produce a gas. The gas is collected over water and found to have a volume of 2.5 L at 25°C and 1 atm. Calculate the number of moles of the gas produced.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1.0 mol
Question 15
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4

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