POST UTME ELIZADE UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?
A. -241.8 kJ/mol
B. -285.8 kJ/mol
C. -393.5 kJ/mol
D. -241.8 kJ/mol
Question 2
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Conical Flask
C. Pipette
D. Thermometer
Question 3
The periodic table is arranged in a way that elements with similar properties are placed in the same group. Which of the following elements is a member of the same group as carbon?
A. silicon
B. germanium
C. tin
D. lead
Question 4
The rate of a chemical reaction is influenced by several factors, including the concentration of reac\tants, temperature, and surface area. What is the term for the rate cons\tant of a chemical reaction?
A. Rate Cons\tant
B. Reaction Rate
C. Activation Energy
D. Catalyst
Question 5
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,2-dibromocyclohexane
Question 6
The atomic number of an element is 26. If the element is in its ground state, what is the number of electrons in a neutral atom of this element?
A. 25
B. 26
C. 27
D. 28
Question 7
Determine the number of moles of nitrogen gas (N2) produced when 2.5 moles of ammonia (NH3) are decomposed according to the equation: 2NH3(g) → N2(g) + 3H2(g).
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 8
A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 1.5 M solution of hydrochloric acid (HCl). If 50 mL of each solution is used, what is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 9
The diagram below shows a molecule of glu\cose. Identify the type of bond labeled A.
A. Single Bond
B. Double Bond
C. Triple Bond
D. Hydrogen Bond
Question 10
A 0.5 M solution of a weak acid HA is mixed with a 0.5 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 11
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 12
A redox reaction involves the transfer of electrons from one species to another. Which of the following reactions is an example of a redox reaction?
A. 2H_2 + O_2 \rightarrow 2H_2O
B. 2Na + Cl_2 \rightarrow 2NaCl
C. 2H_2O \rightarrow 2H_2 + O_2
D. 2NaCl \rightarrow 2Na + Cl_2
Question 13
A 1.0 M solution of a weak acid HA is mixed with a 1.0 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 14
A 0.5 M solution of a weak acid HA is mixed with a 0.5 M solution of a strong base NaOH. If the resulting solution is 0.5 M in both HA and NaOH, what is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 15
A 2.50 g sample of a polymer is dissolved in 25.0 mL of solvent. Calculate the molar mass of the polymer if the osmotic pressure is 1.50 atm at 25°C.
A. 1000 g/mol
B. 2000 g/mol
C. 5000 g/mol
D. 10000 g/mol

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