POST UTME BOWEN UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the empirical formula of a compound containing 0.850 g of carbon and 1.35 g of hydrogen, assuming a 100.0 g sample.
A. CH2
B. CH4
C. C2H6
D. C3H8
Question 2
The solubility of a sparingly soluble salt, M2X (where M is a univalent cation and X is a divalent anion), in water is 1.2 × 10^\( -3 \) g/L at 25°C. If 100 mL of a 0.1 M MCl solution is mixed with 100 mL of a 0.2 M Na2X solution, what is the concentration of the resulting solution?
A. 0.15 M
B. 0.20 M
C. 0.25 M
D. 0.30 M
Question 3
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of the HCl solution is added to 100 mL of the NaOH solution, what is the concentration of the resulting solution?
A. 0.15 M
B. 0.20 M
C. 0.25 M
D. 0.30 M
Question 4
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. Calculate the pH of the resulting solution.
A. 7
B. 8
C. 9
D. 10
Question 5
A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. If 50 mL of the H2SO4 solution is added to 100 mL of the NaOH solution, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 6
The reaction of nitrogen dioxide with water is represented by the equation: \( 2NO_2\( g \ \) + H_2O(l) \rightarrow HNO_3(aq) + NO(g) ). What is the value of \( Delta H^{circ} \) for this reaction, given that \( Delta H^{circ}_{f}\( NO_2 \ \) = -111.3 , kJ/mol ), \( Delta H^{circ}_{f}\( H_2O \ \) = -285.8 , kJ/mol ), \( Delta H^{circ}_{f}\( HNO_3 \ \) = -205.0 , kJ/mol ), and \( Delta H^{circ}_{f}\( NO \ \) = 90.3 , kJ/mol )?
A. -217.8 kJ/mol
B. -217.3 kJ/mol
C. -217.9 kJ/mol
D. -217.2 kJ/mol
Question 7
The s\tandard electrode potential of the couple Mn2+/Mn is -1.18 V. Calculate the s\tandard electrode potential of the couple MnO42-/Mn2+.
A. -0.90 V
B. -1.18 V
C. -1.35 V
D. -1.50 V
Question 8
A 1.00-L sample of a gas at 25.0°C and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.500 L
B. 1.00 L
C. 2.00 L
D. 4.00 L
Question 9
The reaction between sulfuric acid (H2SO4) and sodium hydroxide (NaOH) is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 25.0 g of H2SO4 is added to 100.0 mL of 1.0 M NaOH, what is the limiting reac\tant?
A. H2SO4
B. NaOH
C. Neither
D. Both
Question 10
The rate cons\tant (k) for a first-order reaction is 0.05 min^\( -1 \). If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 11
A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 12
The reaction between sulfuric acid and sodium hydroxide is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 50.0 g of H2SO4 is added to 100.0 g of NaOH, what is the limiting reac\tant?
A. H2SO4
B. NaOH
C. Neither
D. Both
Question 13
What is the pH of a 0.100 M solution of HCl?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
A 50.0 mL sample of a solution containing 0.200 M NaOH is mixed with 50.0 mL of a solution containing 0.100 M HCl. What is the concentration of the resulting solution?
A. 0.050 M
B. 0.100 M
C. 0.150 M
D. 0.200 M
Question 15
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of the HCl solution is added to 100 mL of the NaOH solution, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0

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