POST UTME NOUN 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a gas is collected over water at 25°C and 1 atm. The volume of the gas is 2.5 L. Calculate the partial pressure of the gas.
A. 0.5 atm
B. 0.75 atm
C. 1.0 atm
D. 1.25 atm
Question 2
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 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
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 6
The diagram below shows a molecular structure. What is the shape of this molecule?
A. Linear
B. Trigonal Planar
C. Tetrahedral
D. Bent
Question 7
A diagram of a titration setup is shown below. If 25.0 mL of 0.1 M HCl is added to 25.0 mL of 0.1 M NaOH, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 8
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -826.4 kJ/mol.
A. -1431.1 kJ/mol
B. -1431.2 kJ/mol
C. -1431.3 kJ/mol
D. -1431.4 kJ/mol
Question 9
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 10
A solution contains 0.1 M NaCl. Calculate the concentration of Cl- ions in the solution.
A. 0.1 M
B. 0.1 M
C. 0.1 M
D. 0.1 M
Question 11
The rate cons\tant (k) for a first-order reaction is given by the equation: k = 2.303/t \log[A]0/[A]t. If the initial concentration of the reac\tant is 0.1 M and the concentration at time t is 0.01 M, what is the value of k?
A. 0.1
B. 0.5
C. 1.0
D. 2.0
Question 12
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 13
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 14
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 15
A diagram of a metal extraction process is shown below. Identify the type of metal being extracted.
A. Aluminum
B. Copper
C. Iron
D. Zinc

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