POST UTME WELLSPRING UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution containing 2.5 g of glu\cose (C6H12O6) is mixed with 250 mL of water. What is the concentration of the solution in g/L?
A. 0.01 g/L
B. 0.1 g/L
C. 1 g/L
D. 10 g/L
Question 2
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 3
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 4
A 1.0 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1 L of water. What is the pOH of the solution?
A. 1.4
B. 1.5
C. 1.6
D. 1.7
Question 5
The diagram below shows the structure of a biomolecule. What type of biomolecule is it?
A. Protein
B. Carbohydrate
C. Lipid
D. Nucleic acid
Question 6
A solution of NaOH is prepared by dissolving 10 g of NaOH in 100 mL of water. What is the concentration of the solution in M?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 7
A sample of a metal (M) has a density of 11.5 g/cm^3. If the volume of the sample is 2.5 cm^3, calculate the mass of the sample.
A. 28.75 g
B. 28.75 g
C. 28.75 g
D. 28.75 g
Question 8
The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much will remain after 15 days?
A. 12.5 mg
B. 25 mg
C. 50 mg
D. 100 mg
Question 9
A sample of a polymer is found to have a molecular weight of 50,000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.5 g/L
C. 5 g/L
D. 50 g/L
Question 10
A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
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 12
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 13
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 14
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH, assuming complete neutralization.
A. 1
B. 7
C. 10
D. 14
Question 15
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2 in the gas mixture?
A. 0.9 atm
B. 0.8 atm
C. 0.7 atm
D. 0.6 atm

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