POST UTME IGBINEDION UNIVERSITY 2023 Chemistry | Objective

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Question 1
A metal 'M' reacts with dilute hydrochloric acid to produce a gas 'G'. The reaction is as follows: M + 2HCl → MG + H2↑. If 2.5 g of M reacts with 10 mL of 2 M HCl, calculate the volume of H2 gas produced at STP.
A. 0.5 L
Correct B. 1.0 L
C. 1.5 L
D. 2.0 L

Correct Answer: B

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Question 2
The diagram below shows a titration setup. Identify the part labeled 'A'.
Correct A. Burette
B. Beaker
C. Conical Flask
D. Pipette

Correct Answer: A

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Question 3
A solution of glu\cose (C6H12O6) is prepared by dissolving 10 g of glu\cose in 100 mL of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 4
The diagram below shows a circuit setup. Identify the part labeled 'B'.
A. Cell
Correct B. Circuit
C. Switch
D. Resistor

Correct Answer: B

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Question 5
A polymer 'P' is prepared by polymerizing 100 g of monomer 'M'. If the molecular weight of 'M' is 50 g/mol, calculate the number of moles of 'M' used.
A. 2 mol
Correct B. 4 mol
C. 6 mol
D. 8 mol

Correct Answer: B

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Question 6
The reaction of cyclohexane with bromine in the presence of light is an example of a
A. substitution reaction
B. elimination reaction
Correct C. addition reaction
D. substitution-elimination reaction

Correct Answer: C

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Question 7
The rate of a reaction is affected by the concentration of the reac\tants. Which of the following best describes the relationship between the rate of reaction and the concentration of the reac\tants?
Correct A. The rate of reaction is directly proportional to the concentration of the reac\tants.
B. The rate of reaction is inversely proportional to the concentration of the reac\tants.
C. The rate of reaction is indep\endent of the concentration of the reac\tants.
D. The rate of reaction is proportional to the square of the concentration of the reac\tants.

Correct Answer: A

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Question 8
The diagram below shows the structure of a polymer.
Correct A. A linear polymer
B. A branched polymer
C. A cross-linked polymer
D. A cyclic polymer

Correct Answer: A

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Question 9
The reaction of sodium with water is an example of a
Correct A. \single displacement reaction
B. double displacement reaction
C. synthesis reaction
D. decomposition reaction

Correct Answer: A

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Question 10
The diagram below shows the structure of a biomolecule.
Correct A. A protein
B. A carbohydrate
C. A lipid
D. A nucleic acid

Correct Answer: A

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Question 11
Determine the rate cons\tant (k) for the first-order reaction: A → B, given that the initial concentration of A is 0.1 M and the concentration of A after 2 hours is 0.05 M.
Correct A. \( k = \frac{2.303}{t} \log \frac{[A]_0}{[A]_t} \)
B. \( k = \frac{[A]_t}{[A]_0} \)
C. \( k = \frac{2.303}{t} \log \frac{[A]_t}{[A]_0} \)
D. \( k = \frac{[A]_0 - [A]_t}{t} \)

Correct Answer: A

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Question 12
A 25.0 mL sample of 0.500 M HCl is titrated with 1.00 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
Correct A. \( V_{NaOH} = \frac{M_{HCl} \times V_{HCl}}{M_{NaOH}} \)
B. \( V_{NaOH} = \frac{M_{NaOH} \times V_{HCl}}{M_{HCl}} \)
C. \( V_{NaOH} = \frac{M_{HCl} \times V_{HCl}}{M_{NaOH} - M_{HCl}} \)
D. \( V_{NaOH} = \frac{M_{NaOH} \times V_{HCl}}{M_{HCl} + M_{NaOH}} \)

Correct Answer: A

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Question 13
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) given that the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. \( Delta H_f^{circ} \( H_2O \ \) = Delta H_f^{circ} \( CO_2 \) + Delta H_f^{circ} \( H_2 \) + Delta H_f^{circ} \( O_2 \) )
Correct B. \( Delta H_f^{circ} \( H_2O \ \) = Delta H_f^{circ} \( CO_2 \) - Delta H_f^{circ} \( H_2 \) - Delta H_f^{circ} \( O_2 \) )
C. \( Delta H_f^{circ} \( H_2O \ \) = Delta H_f^{circ} \( CO_2 \) + Delta H_f^{circ} \( H_2 \) - Delta H_f^{circ} \( O_2 \) )
D. \( Delta H_f^{circ} \( H_2O \ \) = Delta H_f^{circ} \( CO_2 \) - Delta H_f^{circ} \( H_2 \) + Delta H_f^{circ} \( O_2 \) )

Correct Answer: B

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Question 14
A 2.00 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. If the specific heat capacity of the metal is 0.100 J/g°C, calculate the energy required to heat the metal.
Correct A. \( Q = mcDelta T \)
B. \( Q = mc^2 Delta T \)
C. \( Q = \frac{mcDelta T}{t} \)
D. \( Q = \frac{mcDelta T}{Delta t} \)

Correct Answer: A

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Question 15
A 10.0 mL sample of 0.500 M NaOH is titrated with 1.00 M HCl. Calculate the pH of the solution after the equivalence point.
Correct A. \( pH = -\log[H^+] \)
B. \( pH = \log[H^+] \)
C. \( pH = -\log[OH^-] \)
D. \( pH = \log[OH^-] \)

Correct Answer: A

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Question 16
The pH of a 0.1 M solution of a weak acid HA is 4.3. If 10 mL of 1 M NaOH is added to 90 mL of the acid solution, what is the new pH?
A. 4.5
Correct B. 4.8
C. 5.1
D. 5.5

Correct Answer: B

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Question 17
A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. If the density of the solution is 1.2 g/mL, what is the molar mass of the polymer?
A. 500 g/mol
B. 750 g/mol
Correct C. 1000 g/mol
D. 1500 g/mol

Correct Answer: C

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Question 18
A 25 mL sample of a 0.1 M solution of a strong acid HCl is titrated with 1 M NaOH. If the pH of the solution after the addition of 15 mL of NaOH is 7.5, what is the concentration of the acid?
A. 0.05 M
Correct B. 0.075 M
C. 0.1 M
D. 0.125 M

Correct Answer: B

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Question 19
A 2.5 g sample of a metal is heated in a crucible until it is completely oxidized. If the mass of the oxide formed is 3.2 g, what is the percentage yield of the oxide?
A. 80%
B. 85%
Correct C. 90%
D. 95%

Correct Answer: C

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Question 20
A 50 mL sample of a 0.1 M solution of a weak base B is titrated with 1 M HCl. If the pH of the solution after the addition of 20 mL of HCl is 4.5, what is the concentration of the base?
A. 0.05 M
Correct B. 0.075 M
C. 0.1 M
D. 0.125 M

Correct Answer: B

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