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POST UTME LAUTECH 2021 Chemistry | Objective

Are you preparing for POST UTME LAUTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 2

A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 3

A metal (X) reacts with hydrochloric acid to produce hydrogen gas. The reaction is as follows: X + 2HCl → XCl2 + H2. If 2.50 g of X reacts with 10.0 mL of 1.00 M HCl, what is the molar mass of X?

A. 50.0 g/mol

B. 75.0 g/mol

Correct C. 100.0 g/mol

D. 125.0 g/mol

Correct Answer: C

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Question 4

A solution contains 0.100 M NaOH and 0.100 M HCl. What is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 5

A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 6

Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.

Correct A. -1785.6 kJ/mol

B. -1785.9 kJ/mol

C. -1786.1 kJ/mol

D. -1786.3 kJ/mol

Correct Answer: A

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Question 7

The s\tandard Gibbs free energy of formation of a metal oxide is -200 kJ/mol. What is the s\tandard Gibbs free energy of formation of the metal?

Correct A. -200 kJ/mol

B. -300 kJ/mol

C. -400 kJ/mol

D. -500 kJ/mol

Correct Answer: A

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Question 8

A metal (M) reacts with chlorine gas to form a metal chloride (MCl2). The s\tandard enthalpy of formation of MCl2(s) is -395.5 kJ/mol. Calculate the s\tandard enthalpy of formation of the metal (M).

Correct A. -395.5 kJ/mol

B. -395.9 kJ/mol

C. -396.1 kJ/mol

D. -396.3 kJ/mol

Correct Answer: A

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Question 9

The s\tandard Gibbs free energy of formation of a metal sulfide is -100 kJ/mol. What is the s\tandard Gibbs free energy of formation of the metal?

Correct A. -100 kJ/mol

B. -200 kJ/mol

C. -300 kJ/mol

D. -400 kJ/mol

Correct Answer: A

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Question 10

A metal (M) reacts with oxygen gas to form a metal oxide (MO). The s\tandard enthalpy of formation of MO(s) is -400 kJ/mol. Calculate the s\tandard enthalpy of formation of the metal (M).

Correct A. -400 kJ/mol

B. -400.5 kJ/mol

C. -401 kJ/mol

D. -401.5 kJ/mol

Correct Answer: A

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Question 11

Determine the number of unpaired electrons in the ground state of a neutral nitrogen atom (atomic number 7).

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 12

A 2.5 M solution of sodium hydroxide (NaOH) is electrolyzed u\sing a platinum electrode. What is the mass of oxygen gas (O2) collected at the anode after 2 hours of electrolysis?

A. 0.15 g

B. 0.30 g

Correct C. 0.45 g

D. 0.60 g

Correct Answer: C

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Question 13

A polymer is made up of repeating units of the following structure: CH2=CH-CH2-CH2-CH3. What is the type of polymerization reaction that occurred to form this polymer?

Correct A. Addition polymerization

B. Condensation polymerization

C. Ring-opening polymerization

D. Step-growth polymerization

Correct Answer: A

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Question 14

A 1.0 M solution of hydrochloric acid (HCl) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the solution after 25 mL of NaOH has been added?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 15

A sample of sulfur (S8) is heated in a stream of oxygen gas (O2). What is the product formed when the sulfur is completely oxidized?

A. SO2

Correct B. SO3

C. SO4^2-

D. S2O3^2-

Correct Answer: B

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Question 16

At 273 K, 1 mole of an ideal gas occupies a volume of 22.4 L. What is the molar volume of the gas at 300 K?

A. 22.4 L

Correct B. 24.5 L

C. 26.8 L

D. 28.9 L

Correct Answer: B

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Question 17

A 2.50 g sample of a metal is dissolved in 50.0 mL of 0.100 M HCl. If the reaction is complete, what is the number of moles of the metal?

A. 0.0100 mol

Correct B. 0.0200 mol

C. 0.0300 mol

D. 0.0400 mol

Correct Answer: B

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Question 18

The diagram below shows a setup for electrolysis of water. What is the purpose of the anode?

A. To produce hydrogen gas

B. To produce oxygen gas

Correct C. To prevent the buildup of hydrogen gas

D. To prevent the buildup of oxygen gas

Correct Answer: C

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Question 19

A 1.00 L sample of a solution contains 0.500 M NaCl. What is the concentration of the solution in g/L?

A. 0.500 g/L

Correct B. 1.00 g/L

C. 2.00 g/L

D. 4.00 g/L

Correct Answer: B

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Question 20

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

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To prevent the buildup of the titrant

D. To prevent the buildup of the analyte

Correct Answer: A

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Question 21

A 0.500 M solution of NaCl is prepared by dissolving 25.0 g of NaCl in 500 mL of water. What is 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 22

A sample of a metal oxide has a mass of 25.0 g and a volume of 5.00 mL. If the density of the metal oxide is 4.50 g/mL, what is the mass of the metal in the sample?

A. 10.0 g

Correct B. 12.5 g

C. 15.0 g

D. 17.5 g

Correct Answer: B

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Question 23

A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl in 1.00 L of water. What is the concentration of H+ ions in the solution?

A. 1.00 M

Correct B. 2.00 M

C. 3.00 M

D. 4.00 M

Correct Answer: B

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Question 24

A sample of a gas has a volume of 2.00 L at a pressure of 1.00 atm and a temperature of 20.0°C. What is the volume of the gas at a pressure of 2.00 atm and a temperature of 30.0°C?

A. 1.50 L

B. 2.00 L

Correct C. 2.50 L

D. 3.00 L

Correct Answer: C

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Question 25

A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in 500 mL of water. What is the concentration of OH- 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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