POST UTME IGBINEDION UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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.
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. \( V_{NaOH} = \frac{M_{NaOH} \times V_{HCl}}{M_{HCl} + M_{NaOH}} \)
Question 2
The diagram below shows a circuit setup. Identify the part labeled 'B'.
A. Cell
B. Circuit
C. Switch
D. Resistor
Question 3
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.
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. \( k = \frac{[A]_0 - [A]_t}{t} \)
Question 4
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} \( O_2 \) )
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} \( O_2 \) )
Question 5
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
B. 0.075 M
C. 0.1 M
D. 0.125 M
Question 6
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
B. 0.075 M
C. 0.1 M
D. 0.125 M
Question 7
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
C. 1000 g/mol
D. 1500 g/mol
Question 8
The reaction of cyclohexane with bromine in the presence of light is an example of a
A. substitution reaction
B. elimination reaction
C. addition reaction
D. substitution-elimination reaction
Question 9
The diagram below shows the structure of a polymer.
A. A linear polymer
B. A branched polymer
C. A cross-linked polymer
D. A cyclic polymer
Question 10
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.
A. \( pH = -\log[H^+] \)
B. \( pH = \log[H^+] \)
C. \( pH = -\log[OH^-] \)
D. \( pH = \log[OH^-] \)
Question 11
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?
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.
Question 12
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
B. 4.8
C. 5.1
D. 5.5
Question 13
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
C. 1.0 M
D. 2.0 M
Question 14
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
B. 1.0 L
C. 1.5 L
D. 2.0 L
Question 15
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.
A. \( Q = mcDelta T \)
B. \( Q = mc^2 Delta T \)
C. \( Q = \frac{mcDelta T}{t} \)
D. \( Q = \frac{mcDelta T}{Delta t} \)

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