POST UTME COAL CITY UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of nitrogen gas (N2) is collected over water at a temperature of 298 K and a pressure of 1 atm. If the vapor pressure of water at this temperature is 0.0313 atm, calculate the partial pressure of N2 in the sample.
A. 0.9687 atm
B. 0.0313 atm
C. 1 atm
D. 0.9687 atm
Question 2
The element with atomic number 16 is placed in group 16 of the periodic table. What is the expected oxidation state of this element in its compounds?
A. 0
B. -2
C. +2
D. +4
Question 3
A 2.5 g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of carbon dioxide produced at STP is 2.5 L. What is the empirical formula of the compound?
A. CH4
B. C2H6
C. C3H8
D. C4H10
Question 4
The s\tandard electrode potential of the Mn2+/Mn couple is +1.18 V. What is the s\tandard electrode potential of the Mn3+/Mn2+ couple?
A. +0.55 V
B. +0.85 V
C. +1.18 V
D. +1.68 V
Question 5
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of each solution is used, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 6
A 3.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the metal oxide has a molar mass of 120 g/mol and the reaction is represented by the equation: M2CO3 → MO + CO2, where M is the metal, calculate the number of moles of metal oxide produced.
A. 0.025 mol
B. 0.05 mol
C. 0.075 mol
D. 0.1 mol
Question 7
The reaction of magnesium metal with hydrochloric acid produces magnesium chloride and hydrogen gas. Write the balanced chemical equation for this reaction.
A. \text{Mg}(s) + \text{HCl}(aq) \rightarrow \text{MgCl}(aq) + \text{H}_2(g)
B. \text{Mg}(s) + 2\text{HCl}(aq) \rightarrow \text{MgCl}_2(aq) + \text{H}_2(g)
C. \text{Mg}(s) + \text{HCl}(aq) \rightarrow \text{MgCl}_2(aq) + \text{H}_2(g)
D. \text{Mg}(s) + \text{H}_2\text{O}(l) \rightarrow \text{MgCl}_2(aq) + \text{H}_2(g)
Question 8
Determine the molar mass of nitrogen gas (N2) u\sing the following data: atomic mass of nitrogen = 14.01 g/mol. The molar volume of an ideal gas at STP is 22.4 L/mol.
A. 28.02 g/mol
B. 22.4 g/mol
C. 14.01 g/mol
D. 6.02 x 10^23 mol^-1
Question 9
A 2.0 M solution of H2SO4 is prepared by dissolving 98 g of H2SO4 in water to make 1.0 L of solution. What is the concentration of H+ ions in the solution?
A. 0.1
B. 0.2
C. 0.4
D. 0.8
Question 10
A catalyst is added to a reaction mixture. Which of the following statements is true?
A. The reaction rate increases.
B. The reaction rate decreases.
C. The reaction equilibrium shifts to the left.
D. The reaction equilibrium shifts to the right.
Question 11
The reaction of an alkene with bromine in the presence of light produces a dibromoalkane. What is the name of the reaction?
A. Addition reaction
B. Substitution reaction
C. Elimination reaction
D. Electrophilic addition reaction
Question 12
A diagram of a titration setup is shown below. 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 mix the titrant and analyte
D. To measure the pH of the solution
Question 13
A 2.5 L flask contains 0.5 g of CO2 at 298 K. If the flask is connected to a 1 atm pressure gauge, what is the partial pressure of CO2 in the flask?
A. 0.5 atm
B. 0.25 atm
C. 0.25 atm
D. 0.5 atm
Question 14
A mixture of 2.0 g of glu\cose and 1.0 g of fructose is dissolved in 100 mL of water. What is the osmotic pressure of the solution at 25°C?
A. 0.50 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 15
The reaction of sodium metal with water is represented by the equation: 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g). What is the oxidation state of sodium in this reaction?
A. 0
B. +1
C. -1
D. +2

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