POST UTME SKYLINE UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.1 M HCl is prepared by dissolving 3.0 g of HCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 3.0 g/L
B. 30 g/L
C. 300 g/L
D. 3000 g/L
Question 2
A solution of 0.1 M NaOH is prepared by dissolving 4.0 g of NaOH in 100 mL of water. What is the concentration of the solution in g/L?
A. 4.0 g/L
B. 40 g/L
C. 400 g/L
D. 4000 g/L
Question 3
A gas at 25°C and 1.00 atm is compressed to 2.00 atm. If the volume of the gas is 2.00 L, what is the new volume of the gas?
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 4
A solution of $NaOH$ is prepared by dissolving $NaOH$ in water. The resulting solution is basic in nature. Explain this phenomenon u\sing the $K_b$ expression for the dissociation of $OH^-$ ions.
A. The $NaOH$ ions act as a base and accept $OH^-$ ions from water.
B. The $NaOH$ ions donate $OH^-$ ions to water, increa\sing the $OH^-$ concentration.
C. The $NaOH$ ions form a complex with $OH^-$ ions, relea\sing $OH^-$ ions.
D. The $NaOH$ ions are a strong base and completely dissociate in water.
Question 5
A solution contains 0.1 M CaCl2 and 0.2 M NaOH. What is the concentration of Ca(OH)2 formed?
A. 0.02 M
B. 0.04 M
C. 0.06 M
D. 0.08 M
Question 6
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -120 kJ/mol. What is the equilibrium cons\tant (K) for this reaction?
A. 1.0 × 10^6
B. 1.0 × 10^5
C. 1.0 × 10^4
D. 1.0 × 10^3
Question 7
Determine the number of moles of ΔFe in 2.5 g of Fe2O3.
A. 0.25 mol
B. 0.5 mol
C. 1.0 mol
D. 1.25 mol
Question 8
A solution of 0.1 M HCl is prepared by dissolving 3.0 g of HCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 3.0 g/L
B. 30 g/L
C. 300 g/L
D. 3000 g/L
Question 9
The reaction of 2,4-dinitrophenylhydrazine \( 2,4-DNP \) with an aldehyde in ethanol is a classic example of a reaction that involves the formation of a hydrazone. What is the name of the reaction?
A. Benedict's reaction
B. Fehling's reaction
C. 2,4-DNP reaction
D. Biuret reaction
Question 10
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Test tube
D. Cylinder
Question 11
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 20 mL of the acid solution requires 15 mL of NaOH for neutralization, calculate the number of moles of the acid present in 100 mL of the solution.
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 12
A mixture of $H_2O$ and $C_6H_6$ is heated to produce a gas. The gas is collected over water and found to have a partial pressure of $760\,mmHg$. If the temperature is $30^\circ C$, calculate the mole \fraction of $H_2O$ in the gas phase.
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 13
The diagram below shows a redox reaction. Identify the oxidizing agent.
A. Oxidizing agent
B. Reducing agent
C. Electron acceptor
D. Electron donor
Question 14
A 0.1 M solution of a weak acid, HA, is titrated with 0.1 M NaOH. If 15 mL of NaOH is required to reach the equivalence point, what is the concentration of the conjugate base \( A- \)?
A. 0.015 M
B. 0.03 M
C. 0.05 M
D. 0.1 M
Question 15
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.6 g/L
B. 6.0 g/L
C. 60 g/L
D. 600 g/L

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