POST UTME LAUTECH 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of sodium hydroxide (NaOH) is electrolyzed u\sing a platinum electrode. What is the mass of oxygen gas (O2) collected at the anode after 2 hours of electrolysis?
A. 0.15 g
B. 0.30 g
C. 0.45 g
D. 0.60 g
Question 2
The diagram below shows a setup for electrolysis of water. What is the purpose of the anode?
A. To produce hydrogen gas
B. To produce oxygen gas
C. To prevent the buildup of hydrogen gas
D. To prevent the buildup of oxygen gas
Question 3
The diagram below shows a setup for a titration experiment. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To prevent the buildup of the titrant
D. To prevent the buildup of the analyte
Question 4
A 50 mL sample of a 0.5 M solution of acetic acid (CH3COOH) is titrated with a 1 M solution of sodium hydroxide (NaOH). What is the volume of NaOH required to reach the equivalence point?
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 5
A 1.0 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. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 7
At 273 K, 1 mole of an ideal gas occupies a volume of 22.4 L. What is the molar volume of the gas at 300 K?
A. 22.4 L
B. 24.5 L
C. 26.8 L
D. 28.9 L
Question 8
Determine the number of unpaired electrons in the ground state of a neutral nitrogen atom (atomic number 7).
A. 1
B. 2
C. 3
D. 4
Question 9
A 2.5 g sample of a non-metallic element is heated in a stream of oxygen gas to produce 3.5 g of the oxide. What is the empirical formula of the oxide?
A. SO2
B. SO3
C. SO4
D. SO5
Question 10
A metal 'M' has a s\tandard electrode potential of +0.5 V. If a cell is constructed with 'M' as the anode and zinc (Zn) as the cathode, what is the s\tandard cell potential of the cell?
A. 0.5 V
B. -0.5 V
C. +1.0 V
D. -1.0 V
Question 11
A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl in 1.00 L of water. What is the concentration of H+ ions in the solution?
A. 1.00 M
B. 2.00 M
C. 3.00 M
D. 4.00 M
Question 12
A solution contains 0.1 M HCl and 0.2 M NaOH. What is the pH of the solution after the reaction between HCl and NaOH is complete?
A. 1
B. 2
C. 3
D. 4
Question 13
A 1.00 L sample of a solution contains 0.500 M NaCl. What is the concentration of the solution in g/L?
A. 0.500 g/L
B. 1.00 g/L
C. 2.00 g/L
D. 4.00 g/L
Question 14
A metal (M) reacts with chlorine gas to form a metal chloride (MCl2). The s\tandard enthalpy of formation of MCl2(s) is -395.5 kJ/mol. Calculate the s\tandard enthalpy of formation of the metal (M).
A. -395.5 kJ/mol
B. -395.9 kJ/mol
C. -396.1 kJ/mol
D. -396.3 kJ/mol
Question 15
A 1.0 M solution of hydrochloric acid (HCl) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.0
B. 2.0
C. 3.0
D. 4.0

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