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POST UTME AL-HIKMAH UNIVERSITY 2019 Chemistry | Objective

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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 0.500 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.

A. 0.0125

Correct B. 0.0250

C. 0.0375

D. 0.0500

Correct Answer: B

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Question 3

The s\tandard electrode potential of the Zn2+/Zn couple is -0.76 V. Calculate the s\tandard electrode potential of the Cu2+/Cu couple if the s\tandard electrode potential of the Cu2+/Cu couple is 0.34 V.

Correct A. 0.10

B. 0.34

C. 0.50

D. 0.76

Correct Answer: A

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Question 4

A 2.50 g sample of an unknown hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. Calculate the molar mass of the hydrocarbon.

A. 12.0

B. 20.0

Correct C. 30.0

D. 40.0

Correct Answer: C

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Question 5

A 0.500 M solution of H2SO4 is titrated with 0.500 M NaOH. Calculate the pH of the solution after 25.0 mL of NaOH has been added.

A. 1.00

B. 2.00

Correct C. 3.00

D. 4.00

Correct Answer: C

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Question 6

The rate cons\tant of a first-order reaction is given by the equation: k = 2.303/t \log[A]0/[A]t. If the half-life of the reaction is 20 minutes, what is the value of k?

Correct A. 0.035 min^-1

B. 0.035 s^-1

C. 0.035 h^-1

D. 0.035 min^-1

Correct Answer: A

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Question 7

A solution contains 0.1 M NaCl. If 10 mL of this solution is diluted to 100 mL, what is the concentration of the resulting solution?

Correct A. 0.01 M

B. 0.1 M

C. 0.01 M

D. 0.001 M

Correct Answer: A

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Question 8

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

Correct A. -110.5 kJ/mol

B. -110.5 kJ/mol

C. -110.5 kJ/mol

D. -110.5 kJ/mol

Correct Answer: A

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Question 9

A 2.0 g sample of a compound containing only C, H, and O is analyzed by combustion. The amount of CO2 produced is 1.2 g, and the amount of H2O produced is 0.8 g. What is the empirical formula of the compound?

Correct A. C2H4O

B. C2H4O2

C. C3H6O

D. C3H6O2

Correct Answer: A

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Question 10

A solution contains 0.1 M HCl. If 10 mL of this solution is added to 100 mL of 0.1 M NaOH, what is the concentration of the resulting solution?

Correct A. 0.01 M

B. 0.1 M

C. 0.01 M

D. 0.001 M

Correct Answer: A

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Question 11

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.

A. -1234.60 kJ/mol

B. -1234.60 kJ/mol

C. -1234.60 kJ/mol

Correct D. -1234.60 kJ/mol

Correct Answer: D

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Question 12

The half-reaction for the reduction of Cu2+ to Cu is: Cu2+ + e- → Cu+ + H+.

A. Cu2+ + 2e- → Cu

Correct B. Cu2+ + e- → Cu+ + H+

C. Cu2+ + 2e- → 2Cu

D. Cu2+ + e- → Cu

Correct Answer: B

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Question 13

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 14

A. -1.10 V

B. -1.10 V

C. -1.10 V

Correct D. 1.10 V

Correct Answer: D

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Question 15

A metal M has a density of 8.5 g/cm3 and a molar mass of 120 g/mol. What is the volume of 2.5 g of M in cm3?

A. 0.29 cm3

B. 0.29 cm3

C. 0.29 cm3

Correct D. 0.29 cm3

Correct Answer: D

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Question 16

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of C(s) to form CO2(g).

A. 393.5 kJ/mol

Correct B. -393.5 kJ/mol

C. 0 kJ/mol

D. -1 kJ/mol

Correct Answer: B

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Question 17

A 2.5 M solution of HCl(aq) is mixed with a 1.5 M solution of NaOH(aq). What is the concentration of the resulting solution?

A. 1.5 M

B. 2.5 M

Correct C. 3.0 M

D. 4.0 M

Correct Answer: C

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Question 18

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 15 years?

Correct A. 12.5 g

B. 25 g

C. 50 g

D. 100 g

Correct Answer: A

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Question 19

A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, what is the partial pressure of the nitrogen gas?

Correct A. 0.5 atm

B. 1 atm

C. 1.5 atm

D. 2 atm

Correct Answer: A

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Question 20

A 1.0 M solution of H2SO4(aq) is mixed with a 2.0 M solution of NaOH(aq). What is the concentration of the resulting solution?

A. 1.0 M

B. 2.0 M

Correct C. 3.0 M

D. 4.0 M

Correct Answer: C

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Question 21

Determine the IUPAC name of the following compound: CH3CH2CH2CH2CH3

A. Bu\tane

Correct B. Pen\tane

C. Hexane

D. Hep\tane

Correct Answer: B

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Question 22

Calculate the s\tandard enthalpy of formation of CO2(g) from the following reaction: C(s) + O2(g) → CO2(g). The s\tandard enthalpies of formation of C(s) and O2(g) are -393.5 kJ/mol and 0 kJ/mol, respectively.

Correct A. -393.5 kJ/mol

B. -393.5 kJ/mol + 0 kJ/mol

C. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol

D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol + 0 kJ/mol

Correct Answer: A

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Question 23

A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the resulting 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 24

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

A. To measure the volume of the acid

Correct B. To measure the volume of the base

C. To measure the pH of the solution

D. To measure the temperature of the solution

Correct Answer: B

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Question 25

A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the resulting pH of the solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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