POST UTME GREENFIELD UNIVERSITY 2019 Chemistry | Objective

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Question 1
A 2.0 M solution of NaOH is prepared by dissolving 40 g of NaOH in water to make 1 L of solution. What is the molarity of the solution?
A. 1.0 M
B. 2.0 M
C. 3.0 M
D. 4.0 M
Question 2
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the resulting concentration of HCl after the reaction is complete?
A. 0 M
B. 1.0 M
C. 0.5 M
D. 2.0 M
Question 3
A 1.0 M solution of HCl is titrated with 1.0 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 4
Determine the number of moles of oxygen gas (O2) required to completely combust 2.5 moles of propane (C3H8) according to the balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O.
A. 1.25
B. 2.5
C. 5
D. 10
Question 5
A solution contains 0.1 M NaCl and 0.2 M CaCl2. What is the total concentration of chloride ions in the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 6
A sample of a non-metallic solid is heated in a crucible until it melts. The resulting liquid has a boiling point of 100°C. What is the identity of the non-metallic solid?
A. Sulfur
B. Phosphorus
C. Arsenic
D. Antimony
Question 7
The atomic radius of an element is 100 pm. If the element is in the 4th period of the periodic table, what is the value of the principal quantum number (n) for this element?
A. 3
B. 4
C. 5
D. 6
Question 8
A mixture of 0.1 mol of NaCl and 0.1 mol of CaCl2 is dissolved in 1 L of water. Calculate the molar conductivity of the solution at 25°C.
A. 0.05 S m^2 mol^-1
B. 0.1 S m^2 mol^-1
C. 0.2 S m^2 mol^-1
D. 0.05 S m^2 mol^-1
Question 9
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of the HCl solution?
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 10
A metal is extracted from its ore u\sing a reduction reaction. The ore is first roasted to convert it into a more reactive form. What is the purpose of roasting the ore?
A. To increase the reactivity of the ore
B. To decrease the reactivity of the ore
C. To convert the ore into a more stable form
D. To remove impurities from the ore
Question 11
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 300 K. If the gas is heated to 400 K at cons\tant volume, what is the new pressure of the gas?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 12
A 2.5 g sample of a metal carbonate is heated to produce 0.75 g of metal oxide. Calculate the molar mass of the metal.
A. 40
B. 60
C. 80
D. 100
Question 13
A 2.0 L flask contains 1.0 mol of an ideal gas at a temperature of 400 K. If the gas is heated to 500 K at cons\tant pressure, what is the new volume of the gas?
A. 2.5 L
B. 3.0 L
C. 3.5 L
D. 4.0 L
Question 14
A solution contains 0.1 mol of a weak electrolyte, X, in 1 L of solution. The conductivity of the solution is 0.005 S/m. Calculate the molar conductivity of X at 25°C.
A. 0.05 S m^2 mol^-1
B. 0.1 S m^2 mol^-1
C. 0.2 S m^2 mol^-1
D. 0.05 S m^2 mol^-1
Question 15
A metal (X) has a density of 8.5 g/cm3 and a mass of 25 g. What is the volume of the metal in cubic centimeters?
A. 2.94 cm3
B. 3.94 cm3
C. 4.94 cm3
D. 5.94 cm3

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