Practice Post UTME MADONNA UNIVERSITY chemistry 2022 Past Questions

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 metal (X) reacts with dilute HCl to produce a gas (Y). The gas (Y) is used in the manufacture of semiconductors. Identify the metal (X) and the gas (Y).

A. Zn, H2

Correct B. Fe, H2

C. Cu, O2

D. Ag, H2

Correct Answer: B

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Question 3

A solution of NaOH is added to a solution of HCl. The resulting solution is a salt of which of the following metals?

Correct A. Na

B. Ca

C. Mg

D. Al

Correct Answer: A

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Question 4

A sample of a metal (X) is heated in a stream of oxygen gas. The resulting product is a solid (Y). Identify the metal (X) and the solid (Y).

Correct A. Fe, Fe2O3

B. Cu, CuO

C. Zn, ZnO

D. Ag, Ag2O

Correct Answer: A

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Question 5

A solution of HCl is added to a solution of NaOH. The resulting solution is a salt of which of the following metals?

Correct A. Na

B. Ca

C. Mg

D. Al

Correct Answer: A

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Question 6

Determine 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. Assume the reaction is: CaO(s) + CO2(g) → CaCO3(s).

Correct A. -1207.6 kJ/mol

B. -1208.6 kJ/mol

C. -1209.6 kJ/mol

D. -1210.6 kJ/mol

Correct Answer: A

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Question 7

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 10.0 mL of NaOH has been added.

A. 2.00

B. 2.50

Correct C. 3.00

D. 3.50

Correct Answer: C

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Question 8

The polymer polyethylene has a repeating unit of CH2CH2. If the molar mass of the polymer is 100,000 g/mol, what is the degree of polymerization?

A. 500

Correct B. 1000

C. 2000

D. 5000

Correct Answer: B

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Question 9

A metal with an atomic number of 20 is heated in air to produce a compound with the formula M2O3. What is the identity of the metal?

A. Ca

B. Mg

Correct C. Ti

D. Zn

Correct Answer: C

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Question 10

The s\tandard enthalpy of formation of CO2(g) is -393.51 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C(s) to produce CO2(g).

Correct A. -393.51 kJ/mol

B. -393.51 kJ/mol + 1.00 kJ/mol

C. -393.51 kJ/mol - 1.00 kJ/mol

D. -393.51 kJ/mol + 2.00 kJ/mol

Correct Answer: A

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Question 11

The atomic number of an element is 26. What is the electronic configuration of this element?

Correct A. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^2

B. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^4

C. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^6

D. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^8

Correct Answer: A

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Question 12

A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in water to make 1 L of solution. What is the pH of the solution?

A. 13.5

Correct B. 14.5

C. 15.5

D. 16.5

Correct Answer: B

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Question 13

A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?

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 separate the titrant and analyte

Correct Answer: A

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Question 14

A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in water to make 1 L of solution. What is the concentration of H+ ions in the solution?

A. 0.01 M

B. 0.1 M

Correct C. 1.0 M

D. 10.0 M

Correct Answer: C

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Question 15

A diagram of a gas collection apparatus is shown below. What is the purpose of the gas collection bulb in this setup?

Correct A. To collect the gas produced

B. To measure the volume of the gas produced

C. To separate the gas from the liquid

D. To mix the gas and liquid

Correct Answer: A

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Question 16

A 1.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in water to make 1 L of solution. What is the concentration of OH- ions in the solution?

A. 0.01 M

B. 0.1 M

Correct C. 1.0 M

D. 10.0 M

Correct Answer: C

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Question 17

A diagram of a distillation setup is shown below. What is the purpose of the condenser in this setup?

A. To cool the vapor

B. To separate the vapor from the liquid

C. To mix the vapor and liquid

D. To measure the volume of the vapor

Correct Answer: VIEW ANSWER

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Question 18

A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?

A. MgO

B. CaO

Correct C. Al2O3

D. Fe2O3

Correct Answer: C

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Question 19

A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?

A. MgO

B. CaO

Correct C. Al2O3

D. Fe2O3

Correct Answer: C

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Question 20

A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?

A. MgO

B. CaO

Correct C. Al2O3

D. Fe2O3

Correct Answer: C

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Question 21

A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?

A. MgO

B. CaO

Correct C. Al2O3

D. Fe2O3

Correct Answer: C

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Question 22

A 2.5 g sample of a non-metallic oxide is heated in a crucible until it decomposes completely. The mass of the residue is 0.5 g. If the oxide is composed of 60% oxygen by mass, what is the empirical formula of the oxide?

A. MgO

B. CaO

Correct C. Al2O3

D. Fe2O3

Correct Answer: C

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Question 23

The reaction of cyclohexane with bromine in the presence of light is an example of a substitution reaction. What is the major product of this reaction?

A. 1-bromocyclohexane

Correct B. cis-1,2-dibromocyclohexane

C. trans-1,2-dibromocyclohexane

D. cyclohexene

Correct Answer: B

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Question 24

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

Correct A. -285.8 kJ/mol

B. -241.8 kJ/mol

C. -393.5 kJ/mol

D. -890.3 kJ/mol

Correct Answer: A

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Question 25

The pH of a solution containing 0.1 M HCl is 1.0. What is the pOH of the solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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