POST UTME COAL CITY UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of nitrogen gas is collected over water at a temperature of 298 K and a pressure of 1.00 atm. What is the partial pressure of nitrogen gas in the sample?
A. 0.95 atm
B. 0.99 atm
C. 1.00 atm
D. 1.03 atm
Question 2
A sample of a polymer has a molecular weight of 50000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.1 g/L
B. 0.5 g/L
C. 1 g/L
D. 5 g/L
Question 3
The following diagram shows a titration setup. What is the purpose of the burette in this setup?
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 separate the titrant and analyte
Question 4
A 2.5 M solution of hydrochloric acid (HCl) is prepared by dissolving 2.5 moles of HCl in 1 liter of water. What is the concentration of the solution in terms of molarity?
A. 1 M
B. 2.5 M
C. 5 M
D. 10 M
Question 5
What is the molar mass of a compound that contains 40% carbon, 30% hydrogen, and 30% oxygen by mass?
A. 60 g/mol
B. 80 g/mol
C. 100 g/mol
D. 120 g/mol
Question 6
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 7
D. 14
Question 7
The following diagram shows a periodic table of elements. Which group of elements is characterized by the presence of unpaired electrons in their outermost energy level?
A. Group 1 (alkali metals)
B. Group 2 (alkaline earth metals)
C. Group 13 (boron group)
D. Group 17 \( ha\logens \)
Question 8
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of 0.5 M H2SO4.
A. 1 mole
B. 2 moles
C. 3 moles
D. 4 moles
Question 9
A metal M reacts with oxygen gas to form a white solid MO. The molar mass of M is 40 g/mol, and the molar mass of MO is 80 g/mol. What is the formula of MO?
A. MO
B. M2O
C. M3O2
D. M2O3
Question 10
In the electrolysis of molten sodium chloride, what is the primary product at the cathode?
A. Sodium metal
B. Chlorine gas
C. Hydrogen gas
D. Sodium chloride
Question 11
In the reaction 2NO(g) + O2(g) → 2NO2(g), what is the oxidation state of nitrogen in NO2?
A. +1
B. +2
C. +3
D. +4
Question 12
A mixture of 10 g of sodium chloride (NaCl) and 20 g of glu\cose (C6H12O6) is dissolved in 100 g of water. What is the mass percentage of glu\cose in the solution?
A. 10%
B. 20%
C. 30%
D. 40%
Question 13
A metal M reacts with chlorine gas to form a white solid MX. The molar mass of M is 55 g/mol, and the molar mass of MX is 120 g/mol. What is the formula of MX?
A. MCl
B. MCl2
C. MCl3
D. MCl4
Question 14
What is the s\tandard enthalpy of formation of CO2(g) at 298 K?
A. +393.5 kJ/mol
B. +393.5 kJ/mol
C. +393.5 kJ/mol
D. +393.5 kJ/mol
Question 15
During electrolysis of a solution of copper(II) sulfate, the anode is made of platinum. What is the most likely reaction occurring at the anode?
A. Oxidation of water to oxygen gas
B. Reduction of copper(II) ions to copper metal
C. Oxidation of copper metal to copper(II) ions
D. Reduction of sulfate ions to hydrogen gas

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