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POST UTME UI 2025 Chemistry | Objective

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Question 1

A 0.5 M solution of AgNO3 is mixed with a 0.5 M solution of NaCl. If the reaction is allowed to proceed to equilibrium, what is the concentration of Ag+ ions in the solution?

Correct A. 0.25 M

B. 0.5 M

C. 1.0 M

D. 1.5 M

Correct Answer: A

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Question 2

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 3

A 2.0 M solution of HCl is mixed with a 2.0 M solution of NaOH. If the reaction is allowed to proceed to equilibrium, what is the pH of the solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 4

A 0.5 M solution of FeCl3 is mixed with a 0.5 M solution of NaOH. If the reaction is allowed to proceed to equilibrium, what is the concentration of Fe(OH)3 in the solution?

A. 0.25 M

Correct B. 0.5 M

C. 1.0 M

D. 1.5 M

Correct Answer: B

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Question 5

A sample of a gas has a volume of 2.0 L at a pressure of 1.0 atm and a temperature of 273 K. If the pressure is increased to 2.0 atm and the temperature is increased to 373 K, what is the new volume of the gas?

A. 4.0 L

Correct B. 6.0 L

C. 8.0 L

D. 10.0 L

Correct Answer: B

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Question 6

A sample of an ideal gas at 25°C and 1 atm is heated to 100°C at cons\tant pressure. Calculate the final volume of the gas, given that the initial volume is 2.5 L.

A. 5.0 L

Correct B. 6.25 L

C. 7.5 L

D. 8.0 L

Correct Answer: B

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Question 7

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. The burette

B. The pipette

C. The Erlenmeyer flask

D. The thermometer

Correct Answer: A

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Question 8

A non-metal 'X' reacts with oxygen to form a compound 'Y'. The compound 'Y' has a molecular formula of X2O5. Identify the non-metal 'X' and the compound 'Y'.

A. X = S, Y = SO2

Correct B. X = P, Y = P2O5

C. X = Cl, Y = Cl2O5

D. X = Br, Y = Br2O5

Correct Answer: B

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Question 9

A solution of NaCl is electrolyzed u\sing a platinum electrode. The diagram below shows the setup. Identify the type of reaction that occurs at the anode.

Correct A. Oxidation reaction

B. Reduction reaction

C. Neutralization reaction

D. Combustion reaction

Correct Answer: A

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Question 10

The diagram below shows a periodic table. Identify the group to which the element 'X' belongs.

A. Group 1

B. Group 2

Correct C. Group 17

D. Group 18

Correct Answer: C

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Question 11

The element with atomic number 36 is _______.

Correct A. Krypton

B. Strontium

C. Barium

D. Radium

Correct Answer: A

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Question 12

The reaction between sodium hydroxide and hydrochloric acid is _______.

Correct A. 2NaOH + HCl -> NaCl + H2O

B. 2HCl + NaOH -> NaCl + H2O

C. 2NaOH + HCl -> NaCl + H2O2

D. 2HCl + NaOH -> NaCl + H2O2

Correct Answer: A

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Question 13

The diagram below shows the titration of a strong acid with a strong base. What is the pH of the resulting solution?

Correct A. 7

B. 10

C. 14

D. 12

Correct Answer: A

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Question 14

The compound with the molecular formula C2H6O is _______.

Correct A. Ethanol

B. Methanol

C. Acetaldehyde

D. Acetone

Correct Answer: A

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Question 15

The reaction between sodium carbonate and hydrochloric acid is _______.

Correct A. Na2CO3 + 2HCl -> NaCl + H2O + CO2

B. Na2CO3 + 2HCl -> NaCl + H2O + CO

C. Na2CO3 + 2HCl -> NaCl + H2O + CH4

D. Na2CO3 + 2HCl -> NaCl + H2O + C2H6

Correct Answer: A

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Question 16

Determine the s\tandard enthalpy of formation of the compound C2H6O (ethanol) from the following data: ΔHf(C2H6O) = -234.7 kJ/mol, ΔHf(C2H6) = -84.7 kJ/mol, ΔHf(O2) = 0 kJ/mol. Assume that the reaction is carried out at 298 K.

Correct A. -150.0 kJ/mol

B. -200.0 kJ/mol

C. -250.0 kJ/mol

D. -300.0 kJ/mol

Correct Answer: A

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Question 17

A sample of polystyrene \( average molecular weight = 200,000 g/mol \) is dissolved in 100 mL of toluene. If the concentration of the solution is 0.5 g/mL, what is the number of polymer chains per unit volume?

A. 1.0 x 10^17 chains/mL

B. 1.0 x 10^18 chains/mL

Correct C. 1.0 x 10^19 chains/mL

D. 1.0 x 10^20 chains/mL

Correct Answer: C

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Question 18

A 1.0 M solution of H2SO4 is prepared by dissolving 98.0 g of H2SO4 in 1.0 L of water. What is the concentration of H+ ions in the solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 19

A 2.0 g sample of a non-metallic element is found to have a mass of 2.5 g after being heated in a Bunsen burner flame. What is the percentage increase in mass?

A. 10%

B. 20%

Correct C. 30%

D. 40%

Correct Answer: C

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Question 20

A solution of 0.1 M NaOH is prepared by dissolving 3.0 g of NaOH in 1.0 L of water. What is the concentration of OH- ions in the solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 21

The reaction of cyclohexane with bromine in the presence of light yields a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?

A. 1,2-dibromocyclohexane

Correct B. 1,4-dibromocyclohexane

C. cis-1,2-dibromocyclohexane

D. trans-1,2-dibromocyclohexane

Correct Answer: B

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Question 22

The atomic radius of an element is 100 pm. If the element is in the 4th period, what is the value of its atomic number?

A. 18

B. 20

Correct C. 22

D. 24

Correct Answer: C

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Question 23

A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.031 atm, what is the mole \fraction of nitrogen in the sample?

A. 0.95

Correct B. 0.96

C. 0.97

D. 0.98

Correct Answer: B

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Question 24

The reaction of sodium hydroxide with sulfuric acid yields sodium sulfate and water. What is the balanced chemical equation for this reaction?

Correct A. NaOH + H2SO4 → Na2SO4 + H2O

B. NaOH + H2SO4 → NaHSO4 + H2O

C. NaOH + H2SO4 → Na2SO4 + 2H2O

D. NaOH + H2SO4 → NaHSO4 + 2H2O

Correct Answer: A

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Question 25

A solution of 0.1 M sodium chloride is prepared by dissolving 6.0 g of sodium chloride in 100 mL of water. What is the concentration of the solution in g/L?

A. 0.6 g/L

Correct B. 0.7 g/L

C. 0.8 g/L

D. 0.9 g/L

Correct Answer: B

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