POST UTME ESUT 2020 Chemistry | Objective

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Question 1
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl?
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 2
A diagram of a gas molecule is shown below. What is the shape of the molecule?
A. Linear
B. Trigonal planar
C. Tetrahedral
D. Bent
Question 3
Determine the number of moles of electrons transferred during the electrolysis of a solution of copper(II) sulfate u\sing a current of 2.5 A for 2.0 hours. The s\tandard reduction potential of copper(II) ion is -0.34 V.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 4
A 2.5 M solution of H2SO4 is electrolyzed u\sing a platinum electrode. If the cell potential is 2.0 V, calculate the number of moles of H2 gas produced at the cathode.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 5
A solution contains 0.1 M AgNO3 and 0.1 M NaCl. What is the concentration of Ag+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 6
Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2NO(g) + O2(g) → 2NO2(g). Given that the s\tandard enthalpy of formation (ΔHf°) for NO(g) is -90.25 kJ/mol, for O2(g) is 0 kJ/mol, and for NO2(g) is -51.3 kJ/mol.
A. -181.15 kJ/mol
B. -181.25 kJ/mol
C. -181.35 kJ/mol
D. -181.45 kJ/mol
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1781.0 kJ/mol
B. -1781.5 kJ/mol
C. -1782.0 kJ/mol
D. -1782.5 kJ/mol
Question 8
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the number of moles of NaOH?
A. 0.0025 mol
B. 0.005 mol
C. 0.0075 mol
D. 0.01 mol
Question 9
A 2.5 L flask contains 0.15 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?
A. 0.50 atm
B. 0.75 atm
C. 1.00 atm
D. 1.25 atm
Question 10
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion of methane (CH4(g)) u\sing the following reaction: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l).
A. -890.3 kJ/mol
B. -890.8 kJ/mol
C. -891.3 kJ/mol
D. -891.8 kJ/mol
Question 11
Calculate the s\tandard enthalpy change for the reaction: 2Ag+(aq) + Cr2O72-(aq) → 2Ag(s) + 2Cr3+(aq) + 7H2O(l). Given that ΔH°\( Ag+\( aq \ \) → Ag(s)) = 105.9 kJ/mol and ΔH°\( Cr2O72-\( aq \ \) → Cr3+(aq)) = -1364.4 kJ/mol.
A. -1200 kJ/mol
B. -1500 kJ/mol
C. -1800 kJ/mol
D. -2000 kJ/mol
Question 12
A 2.5 L flask contains 0.5 M H2(g). What is the partial pressure of H2(g) in the flask?
A. 0.1 atm
B. 0.2 atm
C. 0.3 atm
D. 0.4 atm
Question 13
A gas at 300 K has a volume of 2.5 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 3.125 L
B. 3.5 L
C. 4 L
D. 4.5 L
Question 14
A solution of 0.250 M NaCl is prepared by dissolving 10.0 g of NaCl in 1.00 L of water. What is the concentration of Cl- ions in the solution?
A. 0.125 M
B. 0.250 M
C. 0.500 M
D. 1.00 M
Question 15
A solution contains 2.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M

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