POST UTME BSU 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.0 M solution of hydrochloric acid is prepared by dissolving 36.5 g of HCl 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
The molar mass of a polymer is 200 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 2.00 g/L
B. 2.00 g/L
C. 2.00 g/L
D. 2.00 g/L
Question 3
A 0.500 M solution of NaCl is electrolyzed u\sing a platinum electrode. If the cell potential is 2.71 V, calculate the number of moles of Cl2 produced at the anode.
A. 0.0025 mol
B. 0.0025 mol
C. 0.0025 mol
D. 0.0025 mol
Question 4
A 0.1 M solution of a weak acid HA has a pH of 4.5. Calculate the concentration of the conjugate base A^- in the solution.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-3 M
D. 1.0 x 10^-2 M
Question 5
A 25 mL sample of a 0.5 M solution of NaOH is mixed with 50 mL of a 0.1 M solution of HCl. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 6
Determine the pH of a 0.1 M solution of HCl in water at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 7
A solution contains 10 g of glu\cose (C6H12O6) dissolved in 100 mL of water. What is the concentration of the solution in g/L?
A. 100 g/L
B. 200 g/L
C. 500 g/L
D. 1000 g/L
Question 8
A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?
A. 2
B. 1
C. 3
D. 4
Question 9
A 2.5 L flask contains 0.050 M H2SO4. Calculate the pH of the solution.
A. 1.3
B. 1.4
C. 1.5
D. 1.6
Question 10
A 2.0 M solution of a salt is prepared by mixing 2.0 g of the salt with 100 mL of water. Calculate the molarity of the solution.
A. 0.02 M
B. 0.2 M
C. 2.0 M
D. 20 M
Question 11
A sample of a gas at 25°C and 1 atm is compressed to 2 atm. Calculate the new volume of the gas.
A. 1/2 V
B. 1/3 V
C. 2/3 V
D. 1/4 V
Question 12
Determine the molar solubility of CaF2 in 0.1 M NaF solution u\sing the common ion effect.
A. 1.0 x 10^-3 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-5 M
D. 1.0 x 10^-6 M
Question 13
A solution of AgNO3 is mixed with a solution of NaCl. The resulting precipitate is AgCl. What is the molar ratio of AgNO3 to NaCl?
A. 1:1
B. 1:2
C. 2:1
D. 3:1
Question 14
The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. What is the oxidation state of chlorine in the product NaClO?
A. 0
B. +1
C. +2
D. +3
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 50 mL of a solvent, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.5 g/L
C. 5.0 g/L
D. 50 g/L

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