POST UTME ESUT 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A $0.50 \text{M}$ solution of $\text{NaOH}$ is mixed with a $0.50 \text{M}$ solution of $\text{HCl}$. 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 gas has a pressure of 2 atm and a volume of 10 L. If the temperature is increased to 300 K, what is the new pressure of the gas if the volume remains cons\tant?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 3
A solution containing 2.5 g of NaCl is mixed with 50 mL of water. If the density of the solution is 1.0 g/mL, calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1.0 M
Question 4
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 5
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 6
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 7
A 100 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. If 50 mL of HCl is required to reach the equivalence point, what is the concentration of NaOH in the solution?
A. 0.05 M
B. 0.05 M
C. 0.06 M
D. 0.07 M
Question 8
A metal oxide, M2O3, has a molar mass of 228 g/mol. What is the identity of the metal?
A. Al
B. Cr
C. Mn
D. Fe
Question 9
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 10
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 11
A polymer, P, has a molecular weight of 100,000 g/mol. If 1 g of P is dissolved in 100 mL of water, what is the concentration of the solution?
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1.0 M
Question 12
The half-life of a radioactive subs\tance is 10 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 20 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
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 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 14
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 9
C. 11
D. 13
Question 15
The reaction of 2-methyl-2-butene with HBr yields 2-bromo-2-methylbu\tane. What is the major product of this reaction?
A. 2-bromo-2-methylbu\tane
B. 2-methyl-2-butene
C. HBr
D. H2O

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