Practice post utme bsu chemistry 2017 Past Questions

Question 1

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.1 M and 0.05 M, respectively, and the rate of reaction is 0.02 M/s after 10 seconds. The reaction is first order with respect to NO and first order with respect to O2.

Correct A. 0.05 s^-1

B. 0.1 s^-1

C. 0.2 s^-1

D. 0.5 s^-1

Correct Answer: A

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Question 2

A 0.1 M solution of NaCl is prepared by dissolving 0.1 mol of NaCl in 1 L of water. What is the concentration of Na+ ions in the solution?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

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Question 3

A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 4

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 5

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 6

Determine the major product of the reaction between 2-methylpropene and HBr.

Correct A. 2-bromo-2-methylpropane

B. 2-bromo-2-methylbu\tane

C. 2-bromo-3-methylbu\tane

D. 2-bromo-2-methylpen\tane

Correct Answer: A

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Question 7

Calculate the molar mass of a compound that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.

A. 60.0 g/mol

B. 80.0 g/mol

Correct C. 120.0 g/mol

D. 180.0 g/mol

Correct Answer: C

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Question 8

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

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 9

A solution contains 0.0500 M HCl and 0.0500 M NaOH. What is the pH of the solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 10

A 10.0 mL sample of 0.100 M NaOH is mixed with 10.0 mL of 0.100 M HCl. What is the pH of the resulting solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 11

A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the metal oxide has a molar mass of 120 g/mol and the carbonate has a molar mass of 100 g/mol, calculate the number of moles of carbon dioxide gas produced.

A. 0.02 mol

B. 0.03 mol

Correct C. 0.04 mol

D. 0.05 mol

Correct Answer: C

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Question 12

A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25 mL of NaOH solution is required to neutralize 20 mL of HCl solution, what is the concentration of the NaOH solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 13

A metal (X) has an atomic number of 20 and an atomic mass of 40 g/mol. If the metal is heated in air, it forms a white solid and a gas. What is the identity of the metal and the gas formed?

Correct A. CaO and CO2

B. MgO and H2

C. K2O and CO2

D. Na2O and H2

Correct Answer: A

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Question 14

A solution of copper(II) sulfate (CuSO4) is electrolyzed u\sing a copper electrode. If the anode is made of copper, what is the reaction at the anode?

A. Cu2+ + 2e- → Cu

Correct B. Cu → Cu2+ + 2e-

C. Cu2+ + 2e- → Cu2O

D. Cu → Cu2O + 2e-

Correct Answer: B

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Question 15

A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25 mL of NaOH solution is required to neutralize 20 mL of HCl solution, what is the concentration of the NaOH solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 16

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.

Correct A. -1206.60 kJ/mol

B. -1206.60 kJ/mol

C. -1206.60 kJ/mol

D. -1206.60 kJ/mol

Correct Answer: A

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Question 17

A 2.50-g sample of a non-metallic oxide, X2O3, is heated in a stream of CO2 gas. The resulting reaction is: X2O3(s) + 3CO2(g) → 2X2(g) + 3CO(g). If the initial pressure of CO2 is 1.00 atm, and the final pressure of CO is 0.500 atm, what is the partial pressure of X2(g)?

Correct A. 0.750 atm

B. 0.750 atm

C. 0.750 atm

D. 0.750 atm

Correct Answer: A

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Question 18

A 25.0-mL sample of a 0.100 M solution of NaCl is mixed with 50.0 mL of a 0.200 M solution of AgNO3. What is the concentration of the resulting solution?

Correct A. 0.0500 M

B. 0.0500 M

C. 0.0500 M

D. 0.0500 M

Correct Answer: A

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Question 19

A 2.00-g sample of a non-metallic oxide, X2O3, is heated in a stream of CO2 gas. The resulting reaction is: X2O3(s) + 3CO2(g) → 2X2(g) + 3CO(g). If the initial pressure of CO2 is 1.00 atm, and the final pressure of CO is 0.500 atm, what is the partial pressure of X2(g)?

Correct A. 0.750 atm

B. 0.750 atm

C. 0.750 atm

D. 0.750 atm

Correct Answer: A

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Question 20

A 25.0-mL sample of a 0.100 M solution of NaCl is mixed with 50.0 mL of a 0.200 M solution of AgNO3. What is the concentration of the resulting solution?

Correct A. 0.0500 M

B. 0.0500 M

C. 0.0500 M

D. 0.0500 M

Correct Answer: A

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Question 21

The polymerization of styrene to polystyrene is an example of a ______________ reaction.

A. chain reaction

B. step-growth reaction

C. condensation reaction

Correct D. addition reaction

Correct Answer: D

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Question 22

The reaction of an aldehyde with a Grignard reagent is an example of a ______________ reaction.

Correct A. aldol reaction

B. Claisen condensation

C. Wittig reaction

D. Grignard reaction

Correct Answer: A

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Question 23

The reaction of a metal with a non-metal to form an ionic compound is an example of a ______________ reaction.

A. synthesis reaction

B. decomposition reaction

Correct C. \single displacement reaction

D. double displacement reaction

Correct Answer: C

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Question 24

The reaction of a strong acid with a weak base is an example of a ______________ reaction.

Correct A. neutralization reaction

B. oxidation-reduction reaction

C. precipitation reaction

D. exchange reaction

Correct Answer: A

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Question 25

The reaction of a metal with oxygen to form a metal oxide is an example of a ______________ reaction.

A. combustion reaction

B. decomposition reaction

Correct C. oxidation-reduction reaction

D. synthesis reaction

Correct Answer: C

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