POST UTME ESUT 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A $0.50 \text{M}$ solution of $\text{HCl}$ is mixed with a $0.50 \text{M}$ solution of $\text{NaOH}$. What is the pH of the resulting solution?
A. $1.0$
B. $2.0$
C. $3.0$
D. $4.0$
Question 2
A sample of a polymer has a molecular weight of 100,000 g/mol. If the density of the polymer is 1.5 g/cm^3, what is the volume of 1 g of the polymer?
A. 0.67 cm^3
B. 1.00 cm^3
C. 1.33 cm^3
D. 2.00 cm^3
Question 3
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the resulting pH after the reaction is complete?
A. 1
B. 2
C. 3
D. 4
Question 4
A solution contains 0.1 M NaCl. If 10 mL of 0.1 M AgNO3 is added to 90 mL of the solution, what is the concentration of AgCl formed?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 5
A solution containing $0.10 \text{M}$ $\text{Na}_2\text{SO}_4$ is mixed with a solution containing $0.20 \text{M}$ $\text{BaCl}_2$. What is the concentration of $\text{BaSO}_4$ that precipitates out of solution?
A. $0.05 \text{M}$
B. $0.10 \text{M}$
C. $0.15 \text{M}$
D. $0.20 \text{M}$
Question 6
Determine the pH of a 0.1 M solution of HCl in water at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the ion product of water is 10^\( -14 \).
A. 1
B. 2
C. 3
D. 4
Question 7
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the s\tandard enthalpy of formation of N2(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol?
A. -45.9 kJ/mol
B. -92.0 kJ/mol
C. 0 kJ/mol
D. 45.9 kJ/mol
Question 8
The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. If 2.5 mol of CO2 is formed at cons\tant pressure, what is the change in enthalpy?
A. -987.5 kJ
B. -1,000 kJ
C. -1,012.5 kJ
D. -1,025 kJ
Question 9
The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 10
Determine the structure of the compound C4H9Cl, given that it is a secondary alkyl halide.
A. \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{Cl} \)
B. \( \text{CH}_3\text{CH}_2\text{CH}\( \text{Cl})\text{CH}_3 \ \)
C. \( \text{CH}_3\text{CH}\( \text{Cl})\text{CH}_2\text{CH}_3 \ \)
D. \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_2\text{Cl} \)
Question 11
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the resulting pH after the reaction is complete?
A. 1
B. 2
C. 3
D. 4
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if 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. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -572.8 kJ/mol
Question 13
A sample of $\text{N}_2$ gas at $25^\circ\text{C}$ and $1.0 \text{atm}$ is collected over water at $25^\circ\text{C}$. If the partial pressure of $\text{H}_2\text{O}$ is $0.031 \text{atm}$, what is the total pressure of the gas mixture?
A. $1.0 \text{atm}$
B. $1.03 \text{atm}$
C. $1.05 \text{atm}$
D. $1.07 \text{atm}$
Question 14
A 100 mL sample of a solution containing 0.1 M NaCl is electrolyzed u\sing a platinum electrode. If the current is 2 A and the time is 10 minutes, what is the mass of Cl2 gas produced?
A. 0.1 g
B. 0.2 g
C. 0.3 g
D. 0.4 g
Question 15
The rate cons\tant of a first-order reaction is given by the equation: k = 2.303/t \log[A]0/[A]t. If the initial concentration of a reac\tant is 0.1 M and the concentration after 10 minutes is 0.01 M, calculate the rate cons\tant (k) of the reaction.
A. 0.0002 min^-1
B. 0.002 min^-1
C. 0.02 min^-1
D. 0.2 min^-1

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