Practice post utme futo chemistry 2021 Past Questions

Question 1

Determine the oxidation state of the underlined element in the compound [Cu\( NH_3 \)_4\( H_2O \)_2]SO_4.

Correct A. +2

B. +1

C. -2

D. 0

Correct Answer: A

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Question 2

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

Correct A. 2-chloro-2-methylpropane

B. 2-chloro-2-methylpropane

C. 2-chloro-2-methylpropane

D. 2-chloro-2-methylpropane

Correct Answer: A

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Question 3

What is the value of the equilibrium cons\tant (K) for the reaction [N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)] at 25°C?

Correct A. 1.8 x 10^\( -33 \)

B. 1.8 x 10^33

C. 1.8 x 10^\( -33 \)

D. 1.8 x 10^33

Correct Answer: A

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Question 4

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

Correct A. 7.00

B. 8.00

C. 9.00

D. 10.0

Correct Answer: A

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Question 5

What is 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. 100.0 g/mol

D. 120.0 g/mol

Correct Answer: C

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Question 6

At 273.15 K, the volume of 1 mole of an ideal gas is 22.4 L. What is the volume of 2 moles of the same gas at the same temperature?

Correct A. 44.8 L

B. 45.6 L

C. 44.8 L

D. 45.6 L

Correct Answer: A

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Question 7

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 8

A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. What is the pressure of the gas?

Correct A. 1.01 atm

B. 1.01 atm

C. 1.01 atm

D. 1.01 atm

Correct Answer: A

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Question 9

The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of H2(g)?

Correct A. 0 kJ/mol

B. 0 kJ/mol

C. 0 kJ/mol

D. 0 kJ/mol

Correct Answer: A

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Question 10

A 1.0 L flask contains 0.5 mol of an ideal gas at 298 K. What is the pressure of the gas?

Correct A. 1.01 atm

B. 1.01 atm

C. 1.01 atm

D. 1.01 atm

Correct Answer: A

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Question 11

The solubility of a subs\tance in water is influenced by the following factors, EXCEPT:

A. Temperature

B. Pressure

C. pH

Correct D. Concentration

Correct Answer: D

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Question 12

The reaction between chlorine gas and sodium hydroxide solution produces a compound that is used as a di\sinfec\tant. What is the name of this compound?

A. Sodium Chloride

Correct B. Sodium Hypochlorite

C. Chlorine Gas

D. Hydrochloric Acid

Correct Answer: B

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Question 13

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

Correct A. To measure the volume of the unknown solution

B. To measure the volume of the known solution

C. To mix the unknown and known solutions

D. To separate the unknown solution from the known solution

Correct Answer: A

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Question 14

The compound with the molecular formula C2H6O is an example of a:

A. Alkane

Correct B. Alcohol

C. Ester

D. Ketone

Correct Answer: B

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Question 15

The reaction between zinc metal and copper(II) sulfate solution produces a compound that is used as a pigment. What is the name of this compound?

A. Zinc Sulfate

B. Copper(II) Oxide

Correct C. Zinc Oxide

D. Copper(II) Sulfate

Correct Answer: C

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Question 16

The rate cons\tant of a first-order reaction is given by the equation: k = 2.303/t \log\( A0/A \). If the initial concentration of a reac\tant is 0.1 M and the concentration after 10 minutes is 0.05 M, calculate the rate cons\tant (k) of the reaction.

Correct A. 0.05 min^-1

B. 0.1 min^-1

C. 0.2 min^-1

D. 0.3 min^-1

Correct Answer: A

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Question 17

A polymer has a molecular weight of 50000 g/mol. If the polymer is composed of 80% carbon, 10% hydrogen, and 10% oxygen by mass, calculate the number of moles of the polymer.

A. 0.1 mol

Correct B. 0.2 mol

C. 0.3 mol

D. 0.4 mol

Correct Answer: B

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Question 18

The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. If 2 moles of CO2 are formed from 1 mole of C and 2 moles of O2, calculate the s\tandard enthalpy change (ΔH) for the reaction.

Correct A. -786 kJ

B. -786.5 kJ

C. -787 kJ

D. -787.5 kJ

Correct Answer: A

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Question 19

A solution contains 10 g of NaCl in 100 mL of water. If the density of the solution is 1.2 g/mL, calculate the molarity of the 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 20

A mixture of 20 g of glu\cose and 10 g of fructose is dissolved in 100 mL of water. If the density of the solution is 1.2 g/mL, calculate the molality of the 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 21

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. The pH of the solution after the addition of 25.0 mL of NaOH is 8.50. What is the concentration of the NaOH solution?

A. 0.100 M

Correct B. 0.0500 M

C. 0.0250 M

D. 0.0125 M

Correct Answer: B

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Question 22

A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The mass of the metal oxide produced is 2.00 g. What is the molar mass of the metal carbonate?

Correct A. 62.00 g/mol

B. 64.00 g/mol

C. 66.00 g/mol

D. 68.00 g/mol

Correct Answer: A

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Question 23

A 100.0 mL sample of a 0.100 M solution of a weak acid is titrated with a 0.100 M solution of a strong base. The pH of the solution after the addition of 50.0 mL of the strong base is 8.50. What is the concentration of the weak acid?

A. 0.100 M

Correct B. 0.0500 M

C. 0.0250 M

D. 0.0125 M

Correct Answer: B

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Question 24

A 2.50 g sample of a metal hydroxide is heated to produce a metal oxide and water vapor. The mass of the metal oxide produced is 2.00 g. What is the molar mass of the metal hydroxide?

Correct A. 60.00 g/mol

B. 62.00 g/mol

C. 64.00 g/mol

D. 66.00 g/mol

Correct Answer: A

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Question 25

A 100.0 mL sample of a 0.100 M solution of a weak acid is titrated with a 0.100 M solution of a strong base. The pH of the solution after the addition of 50.0 mL of the strong base is 8.50. What is the concentration of the weak acid?

A. 0.100 M

Correct B. 0.0500 M

C. 0.0250 M

D. 0.0125 M

Correct Answer: B

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