POST UTME COAL CITY UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M
Question 3
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 4
What is the pH of a 0.1 M solution of hydrochloric acid?
A. 1
B. 2
C. 3
D. 4
Question 5
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 6
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 7
A metal M has a density of 8.00 g/cm^3 and a molar mass of 120 g/mol. What is the volume of 2.50 g of this metal?
A. 0.250 cm^3
B. 0.500 cm^3
C. 1.00 cm^3
D. 2.00 cm^3
Question 8
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 9
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 10
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 11
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 2.5 moles of NaOH in 1 liter of water. What is the concentration of the solution in terms of normality?
A. 1 N
B. 2.5 N
C. 5 N
D. 10 N
Question 12
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 13
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 sodium chloride in the solution?
A. 10%
B. 20%
C. 30%
D. 40%
Question 14
A 2.5 g sample of a metal M is heated in a crucible until it melts. The mass of the crucible and the metal is 3.2 g. What is the molar mass of M?
A. 40 g/mol
B. 50 g/mol
C. 60 g/mol
D. 70 g/mol
Question 15
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

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