Practice Post UTME VERITAS UNIVERSITY chemistry 2018 Past Questions

Question 1

Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).

A. 0.0500 mol

Correct B. 0.100 mol

C. 0.150 mol

D. 0.200 mol

Correct Answer: B

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Question 2

A 2.00 L flask contains 0.500 mol of an ideal gas at 25°C. What is the pressure of the gas in the flask?

A. 1.00 atm

Correct B. 2.00 atm

C. 3.00 atm

D. 4.00 atm

Correct Answer: B

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Question 3

A solution of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 4

A 0.500 L flask contains 0.100 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?

A. 0.500 atm

Correct B. 1.00 atm

C. 1.50 atm

D. 2.00 atm

Correct Answer: B

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Question 5

A 2.00 L flask contains 0.500 mol of an ideal gas at 25°C. What is the number of moles of gas in the flask?

A. 0.250 mol

Correct B. 0.500 mol

C. 0.750 mol

D. 1.00 mol

Correct Answer: B

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Question 6

A 2.50 g sample of an unknown hydrocarbon is burned in a combustion calorimeter, producing 8.00 mL of CO2 gas at STP. If the molar mass of the hydrocarbon is 84.0 g/mol, what is its empirical formula?

Correct A. C2H4

B. C3H6

C. C4H8

D. C5H10

Correct Answer: A

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Question 7

A solution of HCl is added to a solution of NaOH. The reaction is as follows: 2NaOH + HCl → NaCl + 2H2O. If 25.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH, what is the concentration of the resulting solution?

A. 0.0500 M

B. 0.100 M

Correct C. 0.150 M

D. 0.200 M

Correct Answer: C

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Question 8

A 2.50 g sample of an unknown hydrocarbon is burned in a combustion calorimeter, producing 8.00 mL of CO2 gas at STP. If the molar mass of the hydrocarbon is 84.0 g/mol, what is its empirical formula?

Correct A. C2H4

B. C3H6

C. C4H8

D. C5H10

Correct Answer: A

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Question 9

A solution of HCl is added to a solution of NaOH. The reaction is as follows: 2NaOH + HCl → NaCl + 2H2O. If 25.0 mL of 0.100 M HCl is added to 25.0 mL of 0.100 M NaOH, what is the concentration of the resulting solution?

A. 0.0500 M

B. 0.100 M

Correct C. 0.150 M

D. 0.200 M

Correct Answer: C

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Question 10

A 2.50 g sample of an unknown hydrocarbon is burned in a combustion calorimeter, producing 8.00 mL of CO2 gas at STP. If the molar mass of the hydrocarbon is 84.0 g/mol, what is its empirical formula?

Correct A. C2H4

B. C3H6

C. C4H8

D. C5H10

Correct Answer: A

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Question 11

Determine the number of moles of oxygen gas (O2) that will react with 2.50 moles of hydrogen gas (H2) according to the balanced equation: 2H2 + O2 → 2H2O.

A. 1.25 moles

B. 2.50 moles

Correct C. 3.75 moles

D. 5.00 moles

Correct Answer: C

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Question 12

A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the resulting pH after the reaction is complete?

A. 7.00

Correct B. 8.00

C. 9.00

D. 10.0

Correct Answer: B

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Question 13

A sample of 1.00 L of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 2.00

B. 3.00

Correct C. 4.00

D. 5.00

Correct Answer: C

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Question 14

A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the resulting pH after the reaction is complete?

A. 1.00

B. 2.00

C. 3.00

Correct D. 4.00

Correct Answer: D

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Question 15

A 1.00 L of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?

A. 3.00

B. 4.00

C. 5.00

Correct D. 6.00

Correct Answer: D

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Question 16

The reaction of ozone (O3) with nitrogen dioxide (NO2) is a complex process involving multiple steps. What is the primary product formed when ozone reacts with nitrogen dioxide in the presence of light?

A. Nitrogen trioxide (NO3)

B. Nitrogen dioxide (NO2)

Correct C. Dinitrogen pentoxide (N2O5)

D. Nitrogen monoxide (NO)

Correct Answer: C

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Question 17

A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 1.0 M solution of hydrochloric acid (HCl). What is the resulting concentration of the sodium chloride (NaCl) solution?

A. 1.5 M

Correct B. 2.0 M

C. 2.5 M

D. 3.0 M

Correct Answer: B

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Question 18

The diagram below shows a titration setup. What is the purpose of the burette in this experiment?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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Question 19

A sample of carbon dioxide (CO2) is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the volume of the CO2 gas collected?

A. 22.4 L

Correct B. 44.8 L

C. 67.2 L

D. 89.6 L

Correct Answer: B

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Question 20

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. What is the purpose of the pipette in this experiment?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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Question 21

The energy of an electron in the nth orbit of a hydrogen atom is given by the equation \( E_n = -\frac{13.6}{n^2} \) eV. What is the energy of an electron in the 3rd orbit?

Correct A. -3.4

B. -1.5

C. 1.1

D. 13.6

Correct Answer: A

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Question 22

A sample of oxygen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 300 K. What is the new volume of the gas if the pressure is increased to 3.0 atm and the temperature is decreased to 200 K?

Correct A. 1.2 L

B. 2.0 L

C. 2.5 L

D. 3.0 L

Correct Answer: A

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Question 23

The reaction between sodium and chlorine produces a compound with the formula NaCl. What is the type of bond that exists between the sodium and chlorine atoms?

Correct A. ionic

B. covalent

C. metallic

D. hydrogen

Correct Answer: A

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Question 24

A solution contains 2.5 g of glu\cose (C6H12O6) dissolved in 100 mL of water. What is the molarity of the solution?

A. 0.25 M

Correct B. 0.50 M

C. 1.0 M

D. 2.0 M

Correct Answer: B

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Question 25

A sample of hydrogen gas occupies a volume of 5.0 L at a pressure of 2.0 atm and a temperature of 400 K. What is the new volume of the gas if the pressure is decreased to 1.0 atm and the temperature is increased to 500 K?

A. 6.7 L

Correct B. 7.0 L

C. 8.0 L

D. 9.0 L

Correct Answer: B

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