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POST UTME DELSU 2017 Chemistry | Objective

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Question 1 View Details

Determine the number of valence electrons in the molecule CH4.

Correct A. 4

B. 6

C. 8

D. 10

Correct Answer: A

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Question 2 View Details

What is the pH of a solution that is 0.1 M in HCl?

Correct A. 0

B. 1

C. 2

D. 3

Correct Answer: A

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Question 3 View Details

A sample of a polymer has a molecular weight of 100,000 g/mol. If 2.5 g of the polymer is dissolved in 25 mL of water, what is the concentration of the solution in g/L?

A. 0.1 g/L

B. 0.5 g/L

Correct C. 1.0 g/L

D. 2.0 g/L

Correct Answer: C

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Question 4 View Details

A solution of NaOH is 0.1 M. If 25 mL of this solution is titrated with 0.1 M HCl, what is the pH of the solution after the titration?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 5 View Details

A sample of a metal has a density of 8.0 g/cm^3. If the volume of the sample is 2.5 cm^3, what is the mass of the sample?

A. 20 g

Correct B. 25 g

C. 30 g

D. 35 g

Correct Answer: B

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Question 6 View Details

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 7 View Details

What is the pH of a 0.1 M solution of HCl?

Correct A. 0

B. 1

C. 2

D. 3

Correct Answer: A

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Question 8 View Details

The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O?

Correct A. -285.8 kJ/mol

B. -241.8 kJ/mol

C. -393.5 kJ/mol

D. -483.5 kJ/mol

Correct Answer: A

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Question 9 View Details

A 2.5 M solution of NaOH is titrated with a 1.0 M solution of HCl. What is the pH of the solution after 25 mL of HCl has been added?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 10 View Details

The diagram below shows a titration curve for the titration of a weak acid with a strong base. What is the pH of the solution at point A?

A. 4

B. 5

Correct C. 6

D. 7

Correct Answer: C

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Question 11 View Details

The atomic radius of an element is 100 pm. If the element is in the 4th period, what is the value of the principal quantum number (n)?

A. 3

Correct B. 4

C. 5

D. 6

Correct Answer: B

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Question 12 View Details

A solution contains 2.5 g of NaCl in 250 mL of water. What is the molarity of the solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 13 View Details

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+?

A. Fe2+ → Fe3+ + e-

Correct B. Fe2+ → Fe3+ + 2e-

C. Fe2+ → Fe3+ + e- + H+

D. Fe2+ → Fe3+ + 2e- + H+

Correct Answer: B

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Question 14 View Details

A colloid is a mixture in which the particles are 1-100 nm in diameter. What is the type of colloid that is formed when 1 g of gum arabic is added to 100 mL of water?

A. True solution

Correct B. Colloid

C. Suspension

D. Emulsion

Correct Answer: B

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Question 15 View Details

A polymer is a large molecule composed of many smaller molecules called monomers. What is the type of polymer that is formed when ethylene is polymerized?

Correct A. Thermoplastic

B. Thermosetting

C. Elastomer

D. Fibers

Correct Answer: A

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Question 16 View Details

Determine the type of reaction that occurs when 1-bromopropane reacts with sodium hydroxide in ethanol.

Correct A. Substitution reaction

B. Elimination reaction

C. Addition reaction

D. Condensation reaction

Correct Answer: A

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Question 17 View Details

Calculate the molar mass of a compound composed of 60.0% carbon, 8.0% hydrogen, and 32.0% oxygen by mass.

A. 120.0 g/mol

B. 150.0 g/mol

Correct C. 180.0 g/mol

D. 200.0 g/mol

Correct Answer: C

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Question 18 View Details

Identify the type of isomerism exhibited by the compound 1,2-dimethylcyclohexane.

A. Structural isomerism

Correct B. Stereoisomerism

C. Conformational isomerism

D. Tautomeric isomerism

Correct Answer: B

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Question 19 View Details

Determine the pH of a solution containing 0.10 M HCl and 0.10 M NaOH.

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 20 View Details

Calculate the concentration of a solution containing 25.0 g of NaCl in 250.0 mL of water.

A. 0.10 M

Correct B. 0.20 M

C. 0.30 M

D. 0.40 M

Correct Answer: B

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Question 21 View Details

Determine the number of unpaired electrons in the ground state of a neutral atom of the element with atomic number 15.

Correct A. 3

B. 5

C. 7

D. 9

Correct Answer: A

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Question 22 View Details

A solution contains 0.500 M NaCl. Calculate the concentration of Cl^- ions in the solution.

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 23 View Details

The molar solubility of Ag2CrO4 is 1.2 x 10^-3 M. Calculate the solubility product cons\tant (Ksp) for Ag2CrO4.

A. 1.4 x 10^-9

Correct B. 1.8 x 10^-9

C. 2.2 x 10^-9

D. 2.6 x 10^-9

Correct Answer: B

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Question 24 View Details

A 2.50-g sample of a non-metallic element is found to have a mass of 2.00 g after being heated in a stream of oxygen gas. Calculate the empirical formula of the element.

Correct A. P2O5

B. SO3

C. Cl2O7

D. Br2O7

Correct Answer: A

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Question 25 View Details

A 1.00-L sample of a gas at 25°C and 1.00 atm is found to have a volume of 0.500 L at 50°C and 2.00 atm. Calculate the number of moles of gas present.

A. 0.500 mol

Correct B. 1.00 mol

C. 1.50 mol

D. 2.00 mol

Correct Answer: B

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