POST UTME BSU 2025 Chemistry | Objective

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Question 1
A polymer is formed by the condensation reaction between a diol and a dicarboxylic acid. If the molecular weight of the diol is 180 g/mol and that of the dicarboxylic acid is 150 g/mol, what is the molecular weight of the polymer formed?
A. 240 g/mol
B. 180 g/mol
C. 150 g/mol
D. 120 g/mol
Question 2
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 3
The reaction between sodium and chlorine gas is a classic example of a synthesis reaction. What is the product of this reaction?
A. NaCl
B. Na2Cl2
C. NaCl2
D. Na2Cl
Question 4
A solution contains 0.1 M NaOH and 0.1 M HCl. Calculate the pH of the solution after 20 mL of 0.1 M HCl has been added to 20 mL of 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 5
A metal (X) reacts with oxygen gas to form a white solid. The reaction is as follows: $\text{X} + \text{O}_2 \rightarrow \text{X}_2\text{O}_3$. If 2.00 g of X reacts with 3.00 g of O$_2$, what is the mass of X$_2$O$_3$ formed?
A. 4.00 g
B. 5.00 g
C. 6.00 g
D. 7.00 g
Question 6
The diagram below shows a simple black and white chemistry apparatus showing a titration setup. What is the purpose of the pipette?
A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution
Question 7
A 25 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 10 mL of HCl has been added.
A. 1
B. 2
C. 3
D. 4
Question 8
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane
Question 9
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1206.0 kJ/mol
B. -1206.5 kJ/mol
C. -1207.0 kJ/mol
D. -1207.5 kJ/mol
Question 10
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.01 M
B. 0.1 M
C. 1 M
D. 10 M
Question 11
A gas occupies a volume of 2 L at a pressure of 1 atm and a temperature of 300 K. What is the volume of the gas at a pressure of 2 atm and a temperature of 400 K?
A. 1 L
B. 2 L
C. 4 L
D. 8 L
Question 12
Determine the pH of a 0.01 M solution of HCl, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 13
The following diagram shows a simple black and white chemistry apparatus showing titration setup. What is the purpose of the pipette?
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 14
A solution contains 0.1 M NaOH and 0.1 M HCl. Calculate the pH of the solution after 10 mL of 0.1 M HCl has been added to 20 mL of 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 15
A 1.0 M solution of H2SO4 is mixed with 1.0 M solution of Ba(OH)2. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

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