POST UTME SKYLINE UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25cm^3 sample of 0.1M HCl is titrated with 0.1M NaOH. What is the pH of the solution after the addition of 25cm^3 of 0.1M NaOH?
A. 1
B. 2
C. 3
D. 4
Question 2
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M
Question 3
A 1.00 L sample of a solution containing $\text{Cu}^{2+}$ ions is treated with excess $\text{NaOH}$ to form a precipitate of $\text{Cu(OH)}_2$ according to the equation $\text{Cu}^{2+}(aq) + 2\text{NaOH}(aq) \rightarrow \text{Cu(OH)}_2(s) + 2\text{Na}^+(aq)$. If 2.50 g of $\text{Cu(OH)}_2$ is obtained, calculate the initial concentration of $\text{Cu}^{2+}$ ions in the solution.
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 4
A 2.0 M solution of hydrochloric acid (HCl) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the concentration of the resulting solution if the reaction is complete?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 3.0 M
Question 5
A 1 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the pH of the solution?
A. 0
B. 1
C. 2
D. 3
Question 6
A 0.1 M solution of a weak base BOH is titrated with a 0.1 M solution of a strong acid HCl. The pH of the solution after the addition of 20 mL of HCl is 4.5. What is the pKb of the base?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 7
A 5.0 g sample of an unknown hydrocarbon is burned in a bomb calorimeter, relea\sing 21.0 kJ of heat energy. What is the molar mass of the hydrocarbon if the heat of combustion is 42.0 kJ/g?
A. 200 g/mol
B. 300 g/mol
C. 400 g/mol
D. 500 g/mol
Question 8
A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution has a vis\cosity of 0.8 Pa·s. What is the molecular weight of the polymer?
A. 1000 g/mol
B. 2000 g/mol
C. 5000 g/mol
D. 10,000 g/mol
Question 9
Determine the number of moles of $\text{CO}_2$ produced when $2.50\,\text{g}$ of $\text{CaCO}_3$ is completely decomposed at $25\,\text{\textdegree C}$ and $1.00\,\text{atm}$.
A. 0.0500\,\text{mol}
B. 0.100\,\text{mol}
C. 0.200\,\text{mol}
D. 0.250\,\text{mol}
Question 10
A 0.500 L sample of a solution containing $\text{Fe}^{2+}$ ions is treated with excess $\text{AgNO}_3$ to form a precipitate of $\text{Ag}_2\text{S}$ according to the equation $\text{Fe}^{2+}(aq) + 2\text{AgNO}_3(aq) \rightarrow \text{Fe}\( \text{NO}_3 \)_2(aq) + 2\text{Ag}(s)$. If 2.50 g of $\text{Ag}_2\text{S}$ is obtained, calculate the initial concentration of $\text{Fe}^{2+}$ ions in the solution.
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 11
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a weak base B. The resulting solution is 0.1 M in both HA and B. If the dissociation cons\tant of HA is 1.0 x 10^-5 and the dissociation cons\tant of B is 1.0 x 10^-6, what is the pH of the resulting solution?
A. 3.0
B. 4.0
C. 5.0
D. 6.0
Question 12
Determine the number of moles of electrons transferred in the electrolysis of 2.5 L of 0.5 M H2SO4.
A. 1 mole
B. 2 moles
C. 3 moles
D. 4 moles
Question 13
A 1.0 M solution of a salt AB is mixed with a 1.0 M solution of a salt AC. If the dissociation cons\tant of AB is 1.0 x 10^-5 and the dissociation cons\tant of AC is 1.0 x 10^-6, what is the concentration of the common ion [A]?
A. 1.0 x 10^-5 M
B. 1.0 x 10^-6 M
C. 1.0 x 10^-7 M
D. 1.0 x 10^-8 M
Question 14
The reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is a classic example of a neutralization reaction. What is the pH of the resulting solution after the reaction is complete?
A. 7
B. 10
C. 14
D. 12
Question 15
A metal M has a s\tandard electrode potential of +0.5 V. If a cell is constructed with M as the anode and a s\tandard hydrogen electrode as the cathode, what is the cell potential?
A. -0.5 V
B. +0.5 V
C. +1.0 V
D. -1.0 V

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