POST UTME DELSU 2022 Chemistry | Objective

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Question 1
Calculate the equilibrium cons\tant (Kc) for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g), given that at equilibrium, [N2] = 0.2 M, [H2] = 0.6 M, and [NH3] = 0.8 M.
A. 0.25
B. 0.50
C. 1.00
D. 2.00
Question 2
The periodic table is arranged in a way that elements with similar properties are placed in the same group. What is the name of the group in which elements such as carbon, silicon, and germanium are placed?
A. Group 1
B. Group 14
C. Group 15
D. Group 16
Question 3
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 1-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
C. 1-chloro-2-methylbu\tane
D. 2-chloro-2-methylbu\tane
Question 4
A 0.5 M solution of NaOH is prepared by dissolving 25 g of NaOH in 1 L of water. Calculate the number of moles of NaOH dissolved in the solution.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1 mol
Question 5
The diagram below represents a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To filter the solution
Question 6
A metal M (atomic number 25) reacts with chlorine gas to form a white solid. The solid is found to be soluble in water and has a characteristic smell. What is the identity of the metal M?
A. Mn
B. Fe
C. Co
D. Ni
Question 7
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7.5. What is the pKa of the acid?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 8
A solution contains 10.0 g of NaCl in 100.0 g of water. What is the molarity of the solution?
A. 0.10 M
B. 0.50 M
C. 1.00 M
D. 2.00 M
Question 9
A 2.5 M solution of HCl is prepared by dissolving 50 g of HCl in 1 L of water. Calculate the number of moles of HCl dissolved in the solution.
A. 1.25 mol
B. 2.5 mol
C. 3.75 mol
D. 5 mol
Question 10
A 1.5 M solution of NaOH is prepared by dissolving 37.5 g of NaOH in 1 L of water. Calculate the number of moles of NaOH dissolved in the solution.
A. 0.75 mol
B. 1.5 mol
C. 2.25 mol
D. 3 mol
Question 11
A metal M reacts with oxygen gas to form a compound with the formula MO. The molar mass of the compound is 80.0 g/mol. What is the identity of the metal M?
A. Ca
B. Mg
C. Al
D. Si
Question 12
The diagram below shows a titration setup.
A. Titration of a strong acid with a strong base
B. Titration of a weak acid with a strong base
C. Titration of a strong acid with a weak base
D. Titration of a weak acid with a weak base
Question 13
A 2.5 M solution of HCl is prepared by dissolving 12.5 g of HCl in water to make 1 L of solution. What is the molarity of the solution?
A. 2.5 M
B. 2.0 M
C. 1.0 M
D. 0.5 M
Question 14
The reaction of sodium hydroxide with hydrochloric acid produces a compound that is a major contributor to acid rain. The equation for this reaction is: \( NaOH + HCl \rightarrow NaCl + H_2O \). What is the type of reaction that occurs in this equation?
A. Synthesis reaction
B. Decomposition reaction
C. Single displacement reaction
D. Double displacement reaction
Question 15
The element with atomic number 12 is classified as a metalloid. Which of the following is a characteristic of metalloids?
A. They are typically brittle and have a high melting point.
B. They are typically malleable and have a low melting point.
C. They are typically conductors of electricity.
D. They are typically semiconductors.

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