POST UTME COAL CITY UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 mL sample of a 0.1 M solution of NaOH is titrated with 0.1 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 50 mL
B. 100 mL
C. 150 mL
D. 200 mL
Question 2
A 2.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 0.976 atm
B. 0.986 atm
C. 0.996 atm
D. 1.00 atm
Question 3
A diagram of a simple electrolytic cell is shown below. What is the purpose of the salt bridge in the cell?
A. To complete the circuit
B. To prevent the buildup of charge
C. To allow ions to flow between the two half-cells
D. To increase the voltage of the cell
Question 4
A 50 mL sample of a 0.2 M solution of HCl is titrated with 0.2 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 1
B. 2
C. 7
D. 14
Question 5
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 6
A 0.250 M solution of NaCl is prepared by dissolving 0.250 g of NaCl in 100.0 mL of water. Calculate the concentration of Na+ ions in the solution.
A. 0.125 M
B. 0.250 M
C. 0.500 M
D. 1.00 M
Question 7
A 50 mL sample of a 0.2 M solution of H2SO4 is titrated with 0.2 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 1
B. 2
C. 7
D. 14
Question 8
A solution contains 0.1 M Na2CO3. What is the concentration of H+ ions in the solution?
A. 0.01 M
B. 0.1 M
C. 0.5 M
D. 1 M
Question 9
A sample of a gas at 25°C and 1 atm is compressed to 4 atm. What is the new volume of the gas?
A. 1/4 V
B. 1/2 V
C. 3/4 V
D. V
Question 10
A 2.00 M solution of H2SO4 is prepared by dissolving 2.00 g of H2SO4 in 100.0 mL of water. Calculate the concentration of H+ ions in the solution.
A. 0.500 M
B. 1.00 M
C. 2.00 M
D. 4.00 M
Question 11
A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 1.0 M solution of hydrochloric acid (HCl). What is the resulting concentration of the solution?
A. 1.5 M
B. 2.0 M
C. 2.5 M
D. 3.0 M
Question 12
A 25 mL sample of a 0.5 M solution of NaOH is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 13
At 298 K, the s\tandard enthalpy change \( ΔH^circ \) for the reaction 2NO(g) + O2(g) → 2NO2(g) is -114.2 kJ/mol. Calculate the s\tandard entropy change \( ΔS^circ \) for the reaction.
A. -143.8 J/mol*K
B. -143.8 J/mol*K
C. -143.8 J/mol*K
D. -143.8 J/mol*K
Question 14
Determine the pH of a 0.1 M solution of HCl after 10 mL of 0.1 M NaOH has been added to 20 mL of the HCl solution. Assume that the volume of the solution remains cons\tant.
A. 1
B. 2
C. 3
D. 4
Question 15
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.00250 mol
B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol

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