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POST UTME ELIZADE UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME ELIZADE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

Determine the number of stereoisomers for the compound 2,3-dimethylpen\tane.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 2

Calculate the pH of a 0.1 M solution of HCl.

Correct A. 0.1

B. 1

C. 2

D. 3

Correct Answer: A

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Question 3

A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.

A. 0.0125

Correct B. 0.025

C. 0.0375

D. 0.05

Correct Answer: B

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Question 4

A diagram of a titration setup is shown below. If 25 mL of 0.5 M NaOH is added to 25 mL of 0.5 M HCl, what is the pH of the resulting solution?

Correct A. 0.1

B. 1

C. 2

D. 3

Correct Answer: A

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Question 5

A diagram of a titration setup is shown below. If 25 mL of 0.5 M NaOH is added to 25 mL of 0.5 M HCl, what is the pH of the resulting solution?

Correct A. 0.1

B. 1

C. 2

D. 3

Correct Answer: A

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Question 6

A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the pKa of the acid.

A. 3.5

Correct B. 4.5

C. 5.5

D. 6.5

Correct Answer: B

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Question 7

A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: X + Cl2 → XCl2. If 2.5 g of X reacts with 1.5 g of Cl2, what is the mass of XCl2 formed?

A. 3.5 g

Correct B. 4.5 g

C. 5.5 g

D. 6.5 g

Correct Answer: B

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Question 8

A sample of a gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased to 300 K, what is the new volume of the gas?

A. 3.5 L

Correct B. 4.5 L

C. 5.5 L

D. 6.5 L

Correct Answer: B

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Question 9

A 2 M solution of a salt (Na2SO4) is prepared by dissolving 2 g of the salt in 100 mL of water. What is the molarity of the solution?

A. 1 M

Correct B. 2 M

C. 3 M

D. 4 M

Correct Answer: B

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Question 10

A metal (X) reacts with oxygen to form a white solid. The reaction is as follows: 4X + 3O2 → 2X2O3. If 2 g of X reacts with 1 g of O2, what is the mass of X2O3 formed?

A. 3.5 g

Correct B. 4.5 g

C. 5.5 g

D. 6.5 g

Correct Answer: B

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Question 11

A sample of a metal alloy contains 85% copper and 15% zinc. If 250g of the alloy is dissolved in 500g of nitric acid, what is the mass of copper dissolved?

A. 150g

B. 175g

Correct C. 200g

D. 225g

Correct Answer: C

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Question 12

A solution of 0.5M HCl is titrated with 0.5M NaOH. What is the pH of the solution after 25mL of NaOH has been added?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 13

A gas at 300K and 1 atm is compressed to 2 atm. What is the new volume of the gas?

A. 0.5L

B. 1L

Correct C. 2L

D. 4L

Correct Answer: C

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Question 14

A solution of 0.1M NaCl is mixed with a solution of 0.1M AgNO3. What is the concentration of the resulting solution?

A. 0.1M

Correct B. 0.2M

C. 0.3M

D. 0.4M

Correct Answer: B

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Question 15

A sample of a gas at 300K and 1 atm is heated to 400K. What is the new pressure of the gas?

A. 1.5atm

B. 2atm

Correct C. 2.5atm

D. 3atm

Correct Answer: C

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Question 16

Determine the number of moles of CO2 produced when 2.50 g of calcium carbonate (CaCO3) is heated in a stream of oxygen gas.

A. 0.0250 mol

Correct B. 0.0500 mol

C. 0.0750 mol

D. 0.100 mol

Correct Answer: B

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Question 17

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 15.0 mL of NaOH?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 18

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CaCO3(s)?

A. -120.3 kJ/mol

B. -180.3 kJ/mol

Correct C. -240.3 kJ/mol

D. -300.3 kJ/mol

Correct Answer: C

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Question 19

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

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 20

A 2.00 L sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 20.0 mL of NaOH?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 21

Determine the oxidation state of the underlined atom in the compound [Cr(H2O)6]Cl3.

Correct A. +3

B. +2

C. +1

D. +6

Correct Answer: A

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Question 22

What is the major product of the reaction between 2-methylpropene and HCl?

Correct A. 2-chloro-2-methylpropane

B. 2-chloro-2-methylbu\tane

C. 2-chloro-2-methylpen\tane

D. 2-chloro-2-methylhexane

Correct Answer: A

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Question 23

A 2.5 L flask contains 0.50 mol of an ideal gas at 27°C. Calculate the pressure of the gas.

A. 1.0 atm

B. 1.5 atm

Correct C. 2.0 atm

D. 2.5 atm

Correct Answer: C

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Question 24

What is the pH of a 0.10 M solution of HCl?

Correct A. 0.00

B. 1.00

C. 2.00

D. 3.00

Correct Answer: A

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Question 25

A sample of CO2 is collected over water at 25°C and 1 atm. If the partial pressure of CO2 is 0.75 atm, what is the mole \fraction of CO2 in the gas mixture?

A. 0.60

B. 0.65

C. 0.70

Correct D. 0.75

Correct Answer: D

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