POST UTME SUMMIT UNIVERSITY 2024 Chemistry | Objective
Practice these randomly selected questions to test your readiness.
Question 1
A 0.500 L sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the titration?
Question 2
A gas at 25°C and 1 atm is compressed to 2 atm. Calculate the new temperature of the gas.
Question 3
Identify the type of hydrocarbon represented by the molecular formula C5H12.
Question 4
The atomic radius of an element is 100 pm. If the element is in its ground state, what is the expected value of its atomic radius in the excited state?
Question 5
Calculate the molar mass of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. The atomic masses of carbon, hydrogen, and oxygen are 12.01 g/mol, 1.008 g/mol, and 16.00 g/mol, respectively.
Question 6
A 0.1 M solution of a weak electrolyte is prepared by dissolving 0.2 g of the electrolyte in 100 mL of water. If the density of the solution is 1.05 g/mL, what is the volume of the solution in liters?
Question 7
A redox reaction involves the oxidation of iron (Fe) to iron(III) oxide (Fe2O3). The reaction is represented by the equation: \( 4Fe + 3O_2 \rightarrow 2Fe_2O_3 \). What is the oxidation number of iron in the product?
Question 8
A 0.2 M solution of a weak electrolyte is prepared by dissolving 0.4 g of the electrolyte in 100 mL of water. If the density of the solution is 1.05 g/mL, what is the volume of the solution in liters?
Question 9
A sample of a gas occupies 2.5 L at a pressure of 1.5 atm. What is the volume of the gas at a pressure of 3.0 atm, assuming the temperature remains cons\tant?
Question 10
A metal 'X' reacts with dilute sulfuric acid to produce a gas 'Y'. The gas 'Y' is passed through a solution of barium chloride to form a white precipitate. Identify the metal 'X' and the gas 'Y'.
Question 11
A metal 'X' reacts with chlorine gas to produce a white solid 'Y'. The solid 'Y' is soluble in water to produce a solution that turns a red litmus paper blue. Identify the metal 'X' and the solid 'Y'.
Question 12
A 1.00 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 50.0 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
Question 13
The atomic radius of an element decreases as you move from left to right across a period in the periodic table. Which of the following elements has the largest atomic radius?
Question 14
Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
Question 15
A solution contains 0.250 M NaOH and 0.100 M HCl. What is the pH of the resulting solution?
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