POST UTME WELLSPRING UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Calculate the molarity of a solution containing 0.5 g of NaOH in 250 mL of water.
A. 0.2 M
B. 0.5 M
C. 1 M
D. 2 M
Question 2
The atomic radius of an element is 100 pm. If the element is in the third period of the periodic table, what is the value of its atomic radius in the next period?
A. 120 pm
B. 110 pm
C. 130 pm
D. 140 pm
Question 3
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in 1 L of water. What is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1 g/L
C. 10 g/L
D. 100 g/L
Question 4
The diagram below shows the structure of a polymer. What type of polymer is it?
A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polystyrene
Question 5
The reaction of an acid with a base is an example of a neutralization reaction. Write the general equation for this reaction.
A. HCl + NaOH → NaCl + H2O
B. HCl + NaOH → NaCl + H2O + Na
C. HCl + NaOH → NaCl + H2O + O2
D. HCl + NaOH → NaCl + H2O + Cl2
Question 6
Calculate the molarity of a solution containing 0.5 g of NaOH in 250 mL of water.
A. 0.2 M
B. 0.5 M
C. 1 M
D. 2 M
Question 7
A solution containing 20% \( v/v \) ethanol is prepared by mixing 100 mL of ethanol with 400 mL of water. What is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1 g/L
C. 10 g/L
D. 100 g/L
Question 8
The reaction of potassium permanganate with hydrogen peroxide in acidic medium is a classic example of a redox reaction. Write the balanced chemical equation for this reaction.
A. 2KMnO4 + 3H2O2 + H2SO4 → K2SO4 + 2MnSO4 + 4H2O + 3O2
B. 2KMnO4 + 3H2O2 + H2SO4 → K2SO4 + 2MnSO4 + 4H2O
C. 2KMnO4 + 3H2O2 → K2SO4 + 2MnSO4 + 4H2O
D. 2KMnO4 + 3H2O2 → K2SO4 + 2MnSO4 + 4H2O + 3O2
Question 9
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 7
C. 10
D. 14
Question 10
A 2.5 M solution of HCl is prepared by dissolving 25 g of HCl in 1 L of water. What is the pH of the solution?
A. 1.3
B. 1.4
C. 1.5
D. 1.6
Question 11
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 7
C. 10
D. 14
Question 12
A solution containing 10% \( w/v \) glu\cose is prepared by dissolving 10 g of glu\cose in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1 g/L
C. 10 g/L
D. 100 g/L
Question 13
The diagram below shows the structure of a polymer. What type of polymer is it?
A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polystyrene
Question 14
The half-life of a radioactive subs\tance is the time required for half of the initial amount of the subs\tance to decay. Which of the following statements is true about the half-life of a radioactive subs\tance?
A. The half-life of a radioactive subs\tance is cons\tant and indep\endent of the initial amount of the subs\tance
B. The half-life of a radioactive subs\tance is dep\endent on the initial amount of the subs\tance
C. The half-life of a radioactive subs\tance is cons\tant and dep\endent on the initial amount of the subs\tance
D. The half-life of a radioactive subs\tance is indep\endent of the initial amount of the subs\tance
Question 15
The diagram below shows the structure of a biomolecule. What type of biomolecule is it?
A. Protein
B. Carbohydrate
C. Lipid
D. Nucleic acid

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