POST UTME GREENFIELD UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 2
Determine the number of moles of oxygen gas (O2) required to react with 2.5 moles of hydrogen gas (H2) in the following reaction: 2H2 + O2 → 2H2O.
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 3
A mixture of 2.5 g of sodium hydroxide (NaOH) and 2.5 g of hydrochloric acid (HCl) is prepared. What is the resulting solution?
A. NaCl(aq)
B. NaOH(aq)
C. HCl(aq)
D. NaOH(aq) + HCl(aq)
Question 4
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C6H12O6(s).
A. -2800
B. -2900
C. -3000
D. -3100
Question 5
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. 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 separate the titrant and analyte
Question 6
A certain element has an atomic number of 18 and an atomic radius of 150 pm. What is its electron configuration?
A. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰
B. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
C. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²
D. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰
Question 7
The diagram below shows the structure of a biomolecule. What is the function of the molecule?
A. Transport of molecules across the cell membrane
B. Synthesis of proteins
C. Storage of genetic information
D. Regulation of cell growth
Question 8
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the number of moles of H2SO4 used.
A. 0.025
B. 0.05
C. 0.075
D. 0.1
Question 9
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylpropene
C. 2-chloro-3-methylbu\tane
D. 2-chloro-3-methylpropane
Question 10
A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. If 20 mL of NaOH is added, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 11
A reaction is first-order with respect to A and second-order with respect to B. The rate cons\tant is 0.05 s^-1. If the initial concentrations of A and B are 0.1 M and 0.2 M, respectively, calculate the rate of reaction after 10 minutes.
A. 0.0001
B. 0.0005
C. 0.001
D. 0.005
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 CO(g)?
A. -110.5
B. -110.5
C. -110.5
D. -110.5
Question 13
A 25.0 mL sample of a solution containing 0.500 M NaOH is mixed with 25.0 mL of a solution containing 0.500 M HCl. What is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 14
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the reac\tant and product?
A. Cu: +2, Cu: +2
B. Cu: +1, Cu: +1
C. Cu: +2, Cu: 0
D. Cu: 0, Cu: +2
Question 15
Determine the pH of a 0.1 M solution of HCl at 25°C.
A. 1
B. 2
C. 3
D. 4

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