POST UTME ELIZADE UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
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 4
A sample of sulfur (S8) has a mass of 12.5 g. Calculate the number of moles of sulfur in the sample, given that the molar mass of sulfur is 32.07 g/mol.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1 mol
Question 5
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 6
The solubility of a subs\tance in water is measured in terms of the amount of subs\tance that can dissolve in a given volume of water at a particular temperature. What is the term for the maximum amount of a subs\tance that can dissolve in a given volume of water at a particular temperature?
A. Solubility Limit
B. Saturated Solution
C. Solubility Product Cons\tant
D. Solubility Equilibrium
Question 7
A 0.100 M solution of HCl is mixed with a 0.100 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) 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. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -285.8 kJ/mol
Question 9
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 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
The reaction between chlorine gas (Cl2) and sodium hydroxide (NaOH) produces sodium chloride (NaCl) and sodium hypochlorite (NaOCl). Write the balanced chemical equation for this reaction.
A. Cl2 + 2NaOH → NaCl + NaOCl + H2O
B. Cl2 + NaOH → NaCl + NaOCl
C. Cl2 + 2NaOH → 2NaCl + NaOCl + H2O
D. Cl2 + NaOH → NaCl + H2O
Question 12
A 2.5 M solution of sulfuric acid (H2SO4) is mixed with a 1.5 M solution of sodium hydroxide (NaOH). If 50 mL of each solution is used, what is the resulting pH?
A. 1
B. 2
C. 3
D. 4
Question 13
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 14
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 15
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

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