POST UTME MOUNTAIN TOP UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.1 M NaOH and 0.2 M HCl. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 2
The rate cons\tant of a first-order reaction is given by \( k = Ae^{-E_a/RT} \). If the activation energy \( E_a \) is 100 kJ/mol, the gas cons\tant ( R ) is 8.314 J/\( mol*K \), and the temperature ( T ) is 300 K, calculate the rate cons\tant ( k ) if the pre-exponential factor ( A ) is 1.0 s\( ^{-1} \).
A. 0.001 s\( ^{-1} \)
B. 0.01 s\( ^{-1} \)
C. 0.1 s\( ^{-1} \)
D. 1.0 s\( ^{-1} \)
Question 3
The atomic radius of an element is 100 pm. If the element has an electron configuration of [Ar] 4s^2 3d^5, what is the expected oxidation state of the element?
A. 2
B. 3
C. 4
D. 5
Question 4
A 1.00 M solution of H2SO4 is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 5
A 2.5 M solution of HCl(aq) is mixed with a 1.5 M solution of NaOH(aq). What is the concentration of the resulting solution?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 6
A 2.00 g sample of a metal carbonate is heated to produce a metal oxide and CO2 gas. If the mass of the metal oxide is 1.50 g, what is the molar mass of the metal carbonate?
A. 100.0 g/mol
B. 120.0 g/mol
C. 140.0 g/mol
D. 160.0 g/mol
Question 7
A 2.50 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
A 2.50 M solution of HCl is mixed with a 1.25 M solution of NaOH. What is the concentration of the resulting solution?
A. 1.25 M
B. 1.50 M
C. 2.00 M
D. 2.50 M
Question 9
A 2.50 M solution of $\text{H}_2\text{SO}_4$ is mixed with 100.0 mL of 0.500 M $\text{NaOH}$. What is the concentration of the resulting solution?
A. 0.500 M
B. 1.00 M
C. 1.25 M
D. 2.00 M
Question 10
A 2.50 M solution of $\text{HCl}$ is mixed with 100.0 mL of 0.500 M $\text{NaOH}$. What is the concentration of the resulting solution?
A. 0.500 M
B. 1.00 M
C. 1.25 M
D. 2.00 M
Question 11
A 0.1 M solution of CaCl2 is mixed with a 0.1 M solution of NaOH. What is the resulting solution?
A. Ca(OH)2
B. CaCl2
C. NaOH
D. H2O
Question 12
A 10 M solution of HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 13
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 20 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 14
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1.5 mol of carbon at 298 K?
A. -165.75 kJ
B. -165.75 kJ/mol
C. -165.75 kJ/mol × 1.5 mol
D. -165.75 kJ/mol × 1.5
Question 15
A mixture of 0.5 mol of CO and 0.5 mol of H2 is heated to 500 K in a 1 L vessel. Assuming ideal behavior, calculate the partial pressure of CO at equilibrium.
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm

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