POST UTME ACHIEVERS UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 -824.2 kJ/mol.
A. -1851.9 kJ/mol
B. -1751.9 kJ/mol
C. -1859.9 kJ/mol
D. -1759.9 kJ/mol
Question 2
What is the major product of the reaction between ethene and bromine?
A. C2H4Br2
B. C2H5Br
C. C2H6
D. C2H4
Question 3
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 4
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 5
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 6
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution
Question 7
The reaction of an alkane with chlorine gas is represented by the equation: R-H + Cl2 → R-Cl + HCl. What is the type of reaction that occurs?
A. Substitution reaction
B. Addition reaction
C. Elimination reaction
D. Condensation reaction
Question 8
A 2.5 g sample of NaOH is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1 M
Question 9
In the extraction of copper from its ore, the following reaction occurs: 2Cu2O + C → 2Cu + 2CO. What is the oxidation state of copper in Cu2O?
A. +1
B. +2
C. +3
D. +4
Question 10
What is the molar mass of the compound C6H12O6?
A. 180.16 g/mol
B. 60.05 g/mol
C. 12.01 g/mol
D. 36.03 g/mol
Question 11
The diagram below shows a graph of the variation of pressure with volume for a gas. What is the shape of the graph?
A. Straight line
B. Curved line
C. Parabolic curve
D. Hyperbolic curve
Question 12
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the volume of the titrant
C. To mix the solution and titrant
D. To filter the solution
Question 13
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase?
A. To separate the components of a mixture
B. To identify the components of a mixture
C. To measure the concentration of a component
D. To purify a component
Question 14
Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in ethanol.
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Condensation reaction
Question 15
Calculate the enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s).
A. -852.6 kJ/mol
B. -1423.8 kJ/mol
C. +852.6 kJ/mol
D. +1423.8 kJ/mol

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