Practice Post UTME VERITAS UNIVERSITY chemistry 2020 Past Questions

Question 1

A 2.50 g sample of a compound containing only carbon and hydrogen is found to have a mass of 1.25 g of carbon. What is the empirical formula of the compound?

Correct A. CH2

B. C2H4

C. C3H6

D. C4H8

Correct Answer: A

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Question 2

A solution of 0.100 M HCl is mixed with a solution of 0.100 M NaOH. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 3

A 25.0 mL sample of a 0.100 M solution of NaOH is mixed with a 25.0 mL sample of a 0.100 M solution of HCl. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 4

A 2.50 g sample of a compound containing only carbon and hydrogen is found to have a mass of 1.25 g of carbon. What is the empirical formula of the compound?

Correct A. CH2

B. C2H4

C. C3H6

D. C4H8

Correct Answer: A

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Question 5

A solution of 0.100 M HCl is mixed with a solution of 0.100 M NaOH. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 6

A 25.0 cm3 sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5 cm3

B. 25.0 cm3

Correct C. 37.5 cm3

D. 50.0 cm3

Correct Answer: C

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Question 7

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

Correct A. A burette

B. A beaker

C. A pipette

D. A measuring cylinder

Correct Answer: A

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Question 8

A sample of a non-metallic oxide is heated strongly. The resulting gas is collected over water and found to have a volume of 2.50 dm3 at 20°C and 1.00 atm. Calculate the number of moles of the gas produced.

A. 0.010 mol

Correct B. 0.020 mol

C. 0.030 mol

D. 0.040 mol

Correct Answer: B

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Question 9

The diagram below shows a gas collection apparatus. Identify the part labeled B.

A. A thermometer

Correct B. A gas collection apparatus

C. A condenser

D. A drying tube

Correct Answer: B

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Question 10

A solution of NaCl is electrolyzed u\sing a current of 2.00 A for 5.00 hours. Calculate the mass of chlorine gas produced at the anode.

A. 0.050 g

B. 0.100 g

Correct C. 0.150 g

D. 0.200 g

Correct Answer: C

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Question 11

Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of potassium chlorate (KClO3) decompose according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).

A. 1.5 moles

B. 2.5 moles

Correct C. 3.75 moles

D. 4.5 moles

Correct Answer: C

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Question 12

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 13

A diagram of a titration setup is shown below. If the burette contains 0.100 M NaOH and the flask contains 25.0 mL of 0.100 M HCl, what is the pH of the solution after the addition of 20.0 mL of NaOH?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 14

A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.0050 mol

Correct B. 0.0100 mol

C. 0.0150 mol

D. 0.0200 mol

Correct Answer: B

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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 flask contains 50.0 mL of 0.100 M HCl, what is the pH of the solution after the addition of 30.0 mL of NaOH?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 16

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to a total volume of 100 mL. If the polymer has a molar mass of 50000 g/mol, what is the concentration of the polymer in the solution in units of g/L?

A. 25 g/L

Correct B. 50 g/L

C. 100 g/L

D. 200 g/L

Correct Answer: B

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Question 17

A 1.0 M solution of a strong acid is mixed with a 1.0 M solution of a strong base. If 50 mL of each solution are mixed, what is the pH of the resulting solution?

A. 0

B. 1

Correct C. 7

D. 14

Correct Answer: C

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Question 18

A 2.0 g sample of a metal is heated in a crucible until it is completely melted. The resulting liquid metal is then cooled slowly over a period of several hours. If the metal has a melting point of 800°C, what is the temperature of the metal at the \end of the cooling process?

A. 600°C

B. 700°C

Correct C. 800°C

D. 900°C

Correct Answer: C

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Question 19

A 1.0 M solution of a weak acid is mixed with a 1.0 M solution of a strong base. If 50 mL of each solution are mixed, what is the pH of the resulting solution?

A. 0

B. 1

Correct C. 7

D. 14

Correct Answer: C

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Question 20

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to a total volume of 100 mL. If the polymer has a molar mass of 50000 g/mol, what is the concentration of the polymer in the solution in units of g/L?

A. 25 g/L

Correct B. 50 g/L

C. 100 g/L

D. 200 g/L

Correct Answer: B

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Question 21

A 1.0 M solution of a strong acid is mixed with a 1.0 M solution of a strong base. If 50 mL of each solution are mixed, what is the pH of the resulting solution?

A. 0

B. 1

Correct C. 7

D. 14

Correct Answer: C

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Question 22

A 2.0 g sample of a metal is heated in a crucible until it is completely melted. The resulting liquid metal is then cooled slowly over a period of several hours. If the metal has a melting point of 800°C, what is the temperature of the metal at the \end of the cooling process?

A. 600°C

B. 700°C

Correct C. 800°C

D. 900°C

Correct Answer: C

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Question 23

A 1.0 M solution of a weak acid is mixed with a 1.0 M solution of a strong base. If 50 mL of each solution are mixed, what is the pH of the resulting solution?

A. 0

B. 1

Correct C. 7

D. 14

Correct Answer: C

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Question 24

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to a total volume of 100 mL. If the polymer has a molar mass of 50000 g/mol, what is the concentration of the polymer in the solution in units of g/L?

A. 25 g/L

Correct B. 50 g/L

C. 100 g/L

D. 200 g/L

Correct Answer: B

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Question 25

The polymerization of styrene to polystyrene is an example of a step-growth polymerization. What is the monomer unit of polystyrene?

Correct A. styrene

B. ethylene

C. propylene

D. butadiene

Correct Answer: A

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