Practice post utme futa chemistry 2018 Past Questions

Question 1

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, ΔHf(C(s)) = 0 kJ/mol.

Correct A. -1206.60 kJ/mol

B. -1206.19 kJ/mol

C. -1206.79 kJ/mol

D. -1206.99 kJ/mol

Correct Answer: A

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Question 2

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?

Correct A. 250 g/mol

B. 250.5 g/mol

C. 250.1 g/mol

D. 249.9 g/mol

Correct Answer: A

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Question 3

Identify the type of isomerism exhibited by the following pair of compounds: CH3CH2CH2CH2CH3 and (CH3)2CHCH2CH3.

A. Structural isomerism

Correct B. Stereoisomerism

C. Constitutional isomerism

D. Geometrical isomerism

Correct Answer: B

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Question 4

A metal M has a density of 7.9 g/cm3 and a molar mass of 120 g/mol. What is the volume of 2.5 mol of the metal?

A. 0.25 cm3

Correct B. 0.50 cm3

C. 0.75 cm3

D. 1.00 cm3

Correct Answer: B

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Question 5

A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm. What is the pressure of the gas if the volume is reduced to 1.0 L?

A. 2.0 atm

B. 2.5 atm

C. 3.0 atm

Correct D. 3.5 atm

Correct Answer: D

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Question 6

The reaction of sulfuric acid with sodium hydroxide is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 25.0 cm3 of 0.500 M H2SO4 is added to 50.0 cm3 of 0.750 M NaOH, what is the limiting reac\tant?

A. H2SO4

Correct B. NaOH

C. Neither

D. Both

Correct Answer: B

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Question 7

A 2.50 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat of combustion is found to be - 35.5 kJ/g. If the molar mass of the hydrocarbon is 84.0 g/mol, what is the s\tandard enthalpy of combustion per mole?

A. - 297 kJ/mol

B. - 297.5 kJ/mol

Correct C. - 298 kJ/mol

D. - 298.5 kJ/mol

Correct Answer: C

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Question 8

A solution of 0.100 M HCl is titrated with 0.100 M NaOH. If 25.0 cm3 of HCl is added to 50.0 cm3 of NaOH, what is the pH of the resulting solution?

A. 1.0

B. 2.0

C. 3.0

Correct D. 4.0

Correct Answer: D

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Question 9

The diagram below shows a circuit with a battery, a resistor, and a capacitor. If the capacitor is initially uncharged, what is the current in the circuit at time t = 0 s?

Correct A. 0 A

B. 1 A

C. 2 A

D. 3 A

Correct Answer: A

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Question 10

A 2.50 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat of combustion is found to be - 35.5 kJ/g. If the molar mass of the hydrocarbon is 84.0 g/mol, what is the s\tandard enthalpy of combustion per mole?

A. - 297 kJ/mol

B. - 297.5 kJ/mol

Correct C. - 298 kJ/mol

D. - 298.5 kJ/mol

Correct Answer: C

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Question 11

A metal 'M' reacts with chlorine gas to form a white solid. The reaction is highly exothermic and releases a large amount of heat. The metal 'M' is most likely to be

A. Ca

B. Mg

C. Al

Correct D. Zn

Correct Answer: D

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Question 12

A solution of sodium hydroxide (NaOH) is mixed with a solution of hydrochloric acid (HCl). The resulting solution has a pH of 7. What is the concentration of the NaOH solution?

A. 0.1 M

Correct B. 0.5 M

C. 1.0 M

D. 2.0 M

Correct Answer: B

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Question 13

A diagram of a titration setup is shown below. The burette contains a solution of sulfuric acid (H2SO4). The flask contains a solution of sodium hydroxide (NaOH). The initial volume of the NaOH solution is 25 mL. After the titration, the volume of the NaOH solution is 50 mL. What is the concentration of the H2SO4 solution?

A. 0.5 M

Correct B. 1.0 M

C. 2.0 M

D. 4.0 M

Correct Answer: B

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Question 14

A gas at a pressure of 2 atm and a temperature of 300 K is allowed to expand to a volume of 10 L. What is the new pressure of the gas?

A. 0.2 atm

B. 0.5 atm

Correct C. 1.0 atm

D. 2.0 atm

Correct Answer: C

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Question 15

A solution of copper(II) sulfate (CuSO4) is electrolyzed u\sing a copper electrode. What is the product formed at the anode?

Correct A. Cu

B. Cu2+

C. SO42-

D. H2O

Correct Answer: A

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Question 16

A diagram of a redox reaction is shown below. The reaction involves the oxidation of iron (Fe) to form iron(III) ions. What is the reducing agent in the reaction?

A. Fe

Correct B. O2

C. H2O

D. OH-

Correct Answer: B

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Question 17

A solution of sodium hydroxide (NaOH) is mixed with a solution of hydrochloric acid (HCl). The resulting solution has a pH of 7. What is the concentration of the NaOH solution?

A. 0.1 M

Correct B. 0.5 M

C. 1.0 M

D. 2.0 M

Correct Answer: B

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Question 18

A diagram of a titration setup is shown below. The burette contains a solution of sulfuric acid (H2SO4). The flask contains a solution of sodium hydroxide (NaOH). The initial volume of the NaOH solution is 25 mL. After the titration, the volume of the NaOH solution is 50 mL. What is the concentration of the H2SO4 solution?

A. 0.5 M

Correct B. 1.0 M

C. 2.0 M

D. 4.0 M

Correct Answer: B

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