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POST UTME NOUN 2021 Chemistry | Objective

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Question 1

A 2.5 M solution of HCl is electrolyzed u\sing a platinum electrode. If the cell potential is 2.0 V, what is the mass of Cl2 gas produced at the anode in 2 hours?

A. 0.5 g

B. 1.0 g

Correct C. 1.5 g

D. 2.0 g

Correct Answer: C

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Question 2

A 0.1 M solution of FeSO4 is electrolyzed u\sing a platinum electrode. If the cell potential is 1.5 V, what is the mass of Fe produced at the cathode in 1 hour?

A. 0.1 g

Correct B. 0.2 g

C. 0.3 g

D. 0.4 g

Correct Answer: B

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Question 3

A 2.0 M solution of NaOH is electrolyzed u\sing a platinum electrode. If the cell potential is 2.5 V, what is the mass of H2 gas produced at the cathode in 2 hours?

A. 1.0 g

Correct B. 2.0 g

C. 3.0 g

D. 4.0 g

Correct Answer: B

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Question 4

A 0.5 M solution of CuSO4 is electrolyzed u\sing a platinum electrode. If the cell potential is 1.0 V, what is the mass of Cu produced at the cathode in 1 hour?

A. 0.1 g

B. 0.2 g

Correct C. 0.3 g

D. 0.4 g

Correct Answer: C

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Question 5

A 2.5 M solution of HCl is electrolyzed u\sing a platinum electrode. If the cell potential is 2.0 V, what is the mass of Cl2 gas produced at the anode in 2 hours?

A. 0.5 g

B. 1.0 g

Correct C. 1.5 g

D. 2.0 g

Correct Answer: C

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Question 6

Determine the s\tandard enthalpy of formation of NO2(g) from the following data: ΔH°f(N2(g)) = 0 kJ/mol, ΔH°f(O2(g)) = 0 kJ/mol, ΔH°f(NO(g)) = 90.29 kJ/mol. The reaction is: N2(g) + 2O2(g) → 2NO2(g).

Correct A. -99.41 kJ/mol

B. -90.29 kJ/mol

C. -80.29 kJ/mol

D. -70.29 kJ/mol

Correct Answer: A

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Question 7

A 2.5 L flask contains 0.050 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

Correct A. 1.01 × 10^5 Pa

B. 2.01 × 10^5 Pa

C. 3.01 × 10^5 Pa

D. 4.01 × 10^5 Pa

Correct Answer: A

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Question 8

A solution contains 0.10 M NaCl. What is the concentration of Cl- ions in the solution?

A. 0.05 M

Correct B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: B

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Question 9

A 0.50 M solution of H2SO4 is mixed with 0.50 M solution of NaOH. What is the concentration of the resulting solution?

A. 0.25 M

Correct B. 0.50 M

C. 0.75 M

D. 1.00 M

Correct Answer: B

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Question 10

A 2.0 L flask contains 0.050 mol of an ideal gas at 25°C. Calculate the number of moles of gas in a 1.0 L flask at 50°C.

A. 0.025 mol

Correct B. 0.050 mol

C. 0.075 mol

D. 0.100 mol

Correct Answer: B

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Question 11

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the initial volume of the HCl solution in liters?

A. 100 mL

Correct B. 200 mL

C. 300 mL

D. 400 mL

Correct Answer: B

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Question 12

A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?

A. 80,000 g/mol

B. 90,000 g/mol

Correct C. 100,000 g/mol

D. 110,000 g/mol

Correct Answer: C

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Question 13

A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. What is the half-reaction for the oxidation of Fe2+?

Correct A. Fe2+ → Fe3+ + e-

B. Fe2+ + e- → Fe3+

C. Fe3+ → Fe2+ + e-

D. Fe2+ + 2H+ → Fe3+ + H2

Correct Answer: A

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Question 14

A solution of 0.1 M HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the initial volume of the NaOH solution in liters?

A. 100 mL

Correct B. 200 mL

C. 300 mL

D. 400 mL

Correct Answer: B

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Question 15

A sample of a polymer has a molecular weight of 100,000 g/mol. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?

A. 80,000 g/mol

B. 90,000 g/mol

Correct C. 100,000 g/mol

D. 110,000 g/mol

Correct Answer: C

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Question 16

Determine the number of moles of ΔH2O produced when 2.5 g of H2SO4 reacts with 3.0 g of NaOH in a reaction where the molar mass of H2SO4 is 98.08 g/mol and the molar mass of NaOH is 40.00 g/mol.

A. 0.025 mol

Correct B. 0.050 mol

C. 0.075 mol

D. 0.100 mol

Correct Answer: B

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Question 17

A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50.0 mL of the HCl solution is added to 100.0 mL of the NaOH solution, what is the pH of the resulting solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 18

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol and the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol?

Correct A. -285.8 kJ/mol

B. -285.6 kJ/mol

C. -285.4 kJ/mol

D. -285.2 kJ/mol

Correct Answer: A

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Question 19

A 0.100 M solution of NaCl is mixed with a 0.100 M solution of AgNO3. If 50.0 mL of the NaCl solution is added to 50.0 mL of the AgNO3 solution, what is the concentration of the resulting solution?

A. 0.050 M

B. 0.100 M

Correct C. 0.150 M

D. 0.200 M

Correct Answer: C

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Question 20

A 2.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. If 50.0 mL of the H2SO4 solution is added to 100.0 mL of the NaOH solution, what is the concentration of the resulting solution?

A. 1.0 M

B. 1.5 M

C. 2.0 M

Correct D. 2.5 M

Correct Answer: D

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Question 21

Determine the type of hybridization exhibited by the central atom in the molecule CH2Cl2.

Correct A. sp3

B. sp2

C. sp

D. dsp3

Correct Answer: A

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Question 22

Calculate the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 23

Identify the type of reaction that occurs when a metal reacts with an acid.

A. Synthesis

B. Decomposition

Correct C. Single displacement

D. Double displacement

Correct Answer: C

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Question 24

Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s).

A. -850 kJ/mol

Correct B. -1000 kJ/mol

C. -1200 kJ/mol

D. -1500 kJ/mol

Correct Answer: B

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Question 25

Determine the type of isomerism exhibited by the compound C4H8O.

Correct A. Structural isomerism

B. Stereoisomerism

C. Conformational isomerism

D. Tautomeric isomerism

Correct Answer: A

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