POST UTME BABCOCK UNIVERSITY 2024 Chemistry | Objective

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Question 1
Determine the molar solubility of BaSO4 in 0.1 M Na2SO4 solution, given that the solubility product cons\tant (Ksp) for BaSO4 is 1.1 × 10^\( -10 \).
A. 1.0 × 10^\( -5 \) M
Correct B. 1.1 × 10^\( -5 \) M
C. 1.2 × 10^\( -5 \) M
D. 1.3 × 10^\( -5 \) M

Correct Answer: B

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Question 2
A 2.50 g sample of a hydrocarbon is burned in a bomb calorimeter, producing 12.5 kJ of heat. If the heat of combustion of the hydrocarbon is 44.0 kJ/g, what is the empirical formula of the hydrocarbon?
Correct A. C2H6
B. C3H8
C. C4H10
D. C5H12

Correct Answer: A

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Question 3
A diagram of a titration setup is shown below.
Correct A. NaOH
B. HCl
C. H2SO4
D. CH3COOH

Correct Answer: A

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Question 4
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in 1.00 L of water. What is the concentration of OH- ions in the solution?
A. 0.250 M
Correct B. 0.500 M
C. 0.750 M
D. 1.00 M

Correct Answer: B

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Question 5
A diagram of a gas collection apparatus is shown below.
Correct A. CH4
B. CO2
C. H2O
D. O2

Correct Answer: A

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Question 6
A 0.1 M solution of a weak acid HA is mixed with 0.1 M NaOH. If the initial pH of the acid is 3.5, what is the pH of the solution after the reaction is complete?
A. 4.5
Correct B. 5.5
C. 6.5
D. 7.5

Correct Answer: B

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Question 7
A metal M has a s\tandard electrode potential of +0.5 V. If a cell is constructed with M as the anode and Zn as the cathode, what is the s\tandard cell potential?
A. +0.5 V
Correct B. +1.0 V
C. +1.5 V
D. +2.0 V

Correct Answer: B

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Question 8
A polymer P has a molecular weight of 100,000 g/mol. If 10 g of P is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 1 g/L
B. 10 g/L
Correct C. 100 g/L
D. 1000 g/L

Correct Answer: C

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Question 9
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. If the initial concentration of Fe2+ is 0.1 M and the initial concentration of MnO4- is 0.01 M, what is the ratio of the concentrations of Fe3+ to Mn2+ after the reaction is complete?
A. 1:1
B. 1:10
Correct C. 10:1
D. 100:1

Correct Answer: C

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Question 10
A catalyst is added to a reaction mixture containing 1.0 M A and 1.0 M B. If the reaction is first-order with respect to A and second-order with respect to B, and the rate cons\tant is 0.01 s-1, what is the rate of reaction after 10 minutes?
A. 0.01 M/s
B. 0.1 M/s
Correct C. 1.0 M/s
D. 10 M/s

Correct Answer: C

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Question 11
The reaction between zinc metal and copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 25.0 mL of 0.100 M CuSO4(aq) is mixed with 25.0 mL of 0.100 M Zn(NO3)2(aq), what is the limiting reac\tant?
A. Zn(s)
B. CuSO4(aq)
C. Zn(NO3)2(aq)
Correct D. Neither Zn(s) nor CuSO4(aq) is the limiting reac\tant.

Correct Answer: D

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Question 12
A 2.50 g sample of a metal carbonate is heated to produce 1.25 g of the metal oxide. What is the molar mass of the metal carbonate?
A. 100 g/mol
B. 150 g/mol
Correct C. 200 g/mol
D. 250 g/mol

Correct Answer: C

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Question 13
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
Correct A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol

Correct Answer: A

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Question 14
A 2.00 M solution of HCl(aq) is mixed with a 2.00 M solution of NaOH(aq) in a 1:1 ratio. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 15
A 1.00 L sample of a 0.100 M solution of NaCl(aq) is mixed with a 1.00 L sample of a 0.100 M solution of AgNO3(aq). What is the concentration of the resulting solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.150 M
D. 0.200 M

Correct Answer: B

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Question 16
A 2.00 g sample of a metal is heated to produce 1.00 g of the metal oxide. What is the molar mass of the metal?
A. 50.0 g/mol
B. 75.0 g/mol
Correct C. 100 g/mol
D. 125 g/mol

Correct Answer: C

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Question 17
A 1.00 L sample of a 0.100 M solution of HCl(aq) is mixed with a 1.00 L sample of a 0.100 M solution of NaOH(aq). What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 18
A 2.00 g sample of a metal carbonate is heated to produce 1.00 g of the metal oxide. What is the molar mass of the metal carbonate?
A. 100 g/mol
B. 150 g/mol
Correct C. 200 g/mol
D. 250 g/mol

Correct Answer: C

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Question 19
A 1.00 L sample of a 0.100 M solution of NaCl(aq) is mixed with a 1.00 L sample of a 0.100 M solution of AgNO3(aq). What is the concentration of the resulting solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.150 M
D. 0.200 M

Correct Answer: B

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Question 20
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 21
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 22
A mixture of 2.0 g of C6H12O6 and 3.0 g of C2H5OH is heated to produce a product. What is the empirical formula of the product?
A. C2H6O
Correct B. C3H6O
C. C4H8O
D. C5H10O

Correct Answer: B

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Question 23
A 10.0 mL sample of 0.500 M H2SO4 is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 10.0 mL of NaOH?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 24
A 25.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of NaOH?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 25
A 2.5 g sample of nitrogen gas (N2) is collected over water at 25°C and 1 atm. Calculate the volume of the gas collected, assuming that the partial pressure of water vapor is 0.025 atm.
A. 0.5 L
Correct B. 1.0 L
C. 1.5 L
D. 2.0 L

Correct Answer: B

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