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POST UTME IGBINEDION UNIVERSITY 2025 Chemistry | Objective

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Question 1

Determine the number of moles of oxygen gas (O2) required to completely combust 2.5 moles of methane gas (CH4) according to the balanced equation: CH4 + 2O2 → CO2 + 2H2O.

Correct A. 1.25 moles

B. 2.5 moles

C. 5 moles

D. 10 moles

Correct Answer: A

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Question 2

A 10% solution of sodium chloride (NaCl) is prepared by dissolving 10 grams of NaCl in 90 grams of water. What is the mass of the solution in grams?

Correct A. 100 grams

B. 90 grams

C. 10 grams

D. 1000 grams

Correct Answer: A

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Question 3

A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.5 grams of the polymer are dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?

A. 0.05 g/L

B. 0.5 g/L

C. 5 g/L

Correct D. 50 g/L

Correct Answer: D

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Question 4

A 2.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 40 grams of HCl in 1 liter of water. What is the concentration of the solution in g/L?

A. 20 g/L

Correct B. 40 g/L

C. 60 g/L

D. 80 g/L

Correct Answer: B

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Question 5

A sample of a non-metallic element has a density of 5.5 g/cm^3. If the volume of the sample is 2.5 cm^3, what is the mass of the sample in grams?

Correct A. 13.75 grams

B. 17.5 grams

C. 20 grams

D. 25 grams

Correct Answer: A

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Question 6

The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 25.0 g of zinc metal is reacted with 50.0 mL of 0.100 M copper(II) sulfate solution, what is the limiting reac\tant?

Correct A. Zinc metal

B. Copper(II) sulfate solution

C. Neither zinc metal nor copper(II) sulfate solution is the limiting reac\tant

D. Both zinc metal and copper(II) sulfate solution are the limiting reac\tants

Correct Answer: A

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Question 7

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)?

Correct A. -110.5 kJ/mol

B. -110.5 kJ/mol

C. -110.5 kJ/mol

D. -110.5 kJ/mol

Correct Answer: A

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Question 8

The half-life of a radioactive subs\tance is 5.0 years. If 100.0 g of the subs\tance is initially present, what is the mass of the subs\tance remaining after 10.0 years?

Correct A. 12.5 g

B. 25.0 g

C. 50.0 g

D. 100.0 g

Correct Answer: A

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Question 9

A 2.00 L flask contains 0.100 M NH3(g) at 25.0°C. What is the partial pressure of NH3(g) in the flask?

Correct A. 0.100 atm

B. 0.500 atm

C. 1.00 atm

D. 2.00 atm

Correct Answer: A

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Question 10

The s\tandard reduction potential of the Cu2+/Cu couple is +0.34 V. What is the s\tandard reduction potential of the Ag+/Ag couple?

Correct A. +0.80 V

B. +0.90 V

C. +1.00 V

D. +1.10 V

Correct Answer: A

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Question 11

A metal oxide, M2O3, reacts with a strong acid, HCl, to form a salt and water. If 2.50 g of M2O3 reacts with 2.00 M HCl to produce 1.50 g of salt, what is the molar mass of M2O3?

A. 150 g/mol

B. 200 g/mol

Correct C. 250 g/mol

D. 300 g/mol

Correct Answer: C

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Question 12

A solution of H2SO4 is 0.500 M. If 25.0 mL of this solution is diluted to 100.0 mL, what is the new concentration?

A. 0.250 M

Correct B. 0.500 M

C. 0.750 M

D. 1.00 M

Correct Answer: B

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Question 13

A catalyst is added to a reaction mixture and the rate of reaction increases by a factor of 5. If the initial rate of reaction is 2.00 mol/L·s, what is the new rate of reaction?

A. 1.00 mol/L·s

B. 2.00 mol/L·s

Correct C. 5.00 mol/L·s

D. 10.0 mol/L·s

Correct Answer: C

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Question 14

A sample of CO2 is collected over water and has a volume of 2.50 L at 25.0°C and 1.00 atm. What is the partial pressure of CO2?

A. 0.500 atm

B. 0.750 atm

Correct C. 1.00 atm

D. 1.25 atm

Correct Answer: C

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Question 15

A diagram of a titration setup is shown below. If the burette contains 0.100 M NaOH and the initial volume is 25.0 mL, what is the concentration of the HCl solution?

A. 0.0500 M

Correct B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: B

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Question 16

The reaction of cyclohexane with bromine in the presence of light produces 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 17

The compound with the molecular formula C4H8O2 is a derivative of which of the following alcohols?

A. ethanol

Correct B. propanol

C. bu\tanol

D. pen\tanol

Correct Answer: B

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Question 18

The compound with the molecular formula C2H6O is a derivative of which of the following alcohols?

Correct A. methanol

B. ethanol

C. propanol

D. bu\tanol

Correct Answer: A

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Question 19

The reaction of sulfur with oxygen produces sulfur dioxide. What is the balanced equation for this reaction?

Correct A. S + O2 → SO2

B. S + O2 → SO3

C. S + O2 → SO4

D. S + O2 → SO5

Correct Answer: A

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Question 20

The compound with the molecular formula C6H12O6 is a derivative of which of the following sugars?

Correct A. glu\cose

B. fructose

C. sucrose

D. lactose

Correct Answer: A

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Question 21

The reaction 2Ag+(aq) + Cr(s) → 2Ag(s) + Cr2+(aq) is an example of a redox reaction. What is the oxidation state of chromium in the reac\tant and product?

Correct A. 0 in reac\tant, +2 in product

B. +2 in reac\tant, 0 in product

C. +3 in reac\tant, +2 in product

D. -2 in reac\tant, +2 in product

Correct Answer: A

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Question 22

The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?

Correct A. 0.005 M

B. 0.01 M

C. 0.05 M

D. 0.1 M

Correct Answer: A

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Question 23

A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 15 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 24

The reaction 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant (k) of 0.05 s^-1. If the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, what is the rate of reaction after 10 seconds?

A. 0.001 M s^-1

B. 0.01 M s^-1

Correct C. 0.05 M s^-1

D. 0.1 M s^-1

Correct Answer: C

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Question 25

A 50 mL sample of 0.1 M H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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