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POST UTME FUTA 2023 Chemistry | Objective

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Question 1 View Details

In the electrolysis of molten sodium chloride, what is the primary product at the cathode?

Correct A. Sodium metal

B. Chlorine gas

C. Hydrogen gas

D. Sodium chloride

Correct Answer: A

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Question 2 View Details

What is the oxidation state of the central atom in the compound [Cr(H2O)6]Cl3?

A. +3

B. +2

Correct C. +6

D. +1

Correct Answer: C

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Question 3 View Details

A metal X has a density of 10.5 g/cm3 and a molar mass of 120 g/mol. What is the volume of 2.5 g of X?

A. 1.2 cm3

Correct B. 2.5 cm3

C. 5.0 cm3

D. 10.0 cm3

Correct Answer: B

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Question 4 View Details

The reaction 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s) is an example of a ______ reaction.

A. synthesis

B. decomposition

Correct C. \single displacement

D. double displacement

Correct Answer: C

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Question 5 View Details

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance decays to 50 g in 10 years, what is the decay cons\tant?

A. 0.05 yr-1

Correct B. 0.10 yr-1

C. 0.15 yr-1

D. 0.20 yr-1

Correct Answer: B

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Question 6 View Details

Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 g of potassium chlorate (KClO3) is decomposed according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).

A. 0.25 mol

Correct B. 0.5 mol

C. 0.75 mol

D. 1.0 mol

Correct Answer: B

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Question 7 View Details

A 25.0 mL sample of 0.100 M HCl is mixed with a 25.0 mL sample of 0.100 M NaOH. Calculate 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 8 View Details

A solution contains 5.0 g of NaCl per 100.0 mL of solution. What is the molarity of the solution?

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 5.0 M

Correct Answer: C

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Question 9 View Details

A 10.0 mL sample of 0.100 M H2SO4 is mixed with a 10.0 mL sample of 0.100 M Ba(OH)2. Calculate the number of moles of BaSO4 formed.

A. 0.01 mol

Correct B. 0.02 mol

C. 0.03 mol

D. 0.04 mol

Correct Answer: B

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Question 10 View Details

A 50.0 mL sample of 0.100 M NaOH is mixed with a 50.0 mL sample of 0.100 M HCl. Calculate 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 11 View Details

Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2NO(g) + O2(g) → 2NO2(g). Given that the s\tandard enthalpy of formation (ΔHf°) for NO(g) is -90.25 kJ/mol, for O2(g) is 0 kJ/mol, and for NO2(g) is -51.3 kJ/mol.

Correct A. -179.4 kJ/mol

B. 179.4 kJ/mol

C. -90.25 kJ/mol

D. 90.25 kJ/mol

Correct Answer: A

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Question 12 View Details

A 0.5 M solution of a weak acid (HA) has a pH of 4.5. Calculate the concentration of the acid (HA) and its conjugate base \( A- \).

A. 0.1 M, 0.1 M

B. 0.01 M, 0.01 M

Correct C. 0.1 M, 0.01 M

D. 0.01 M, 0.1 M

Correct Answer: C

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Question 13 View Details

A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.

A. 200 g/mol

Correct B. 500 g/mol

C. 1000 g/mol

D. 2000 g/mol

Correct Answer: B

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Question 14 View Details

A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 mL of water. Calculate the molarity of the solution.

A. 0.1 M

Correct B. 0.5 M

C. 1 M

D. 2 M

Correct Answer: B

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Question 15 View Details

A 1 M solution of H2SO4 is mixed with a 1 M solution of NaOH. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 16 View Details

At 25°C, the vapor pressure of a solution containing 10.0 g of urea in 50.0 g of water is 75.0 mmHg. If the vapor pressure of pure water at 25°C is 23.8 mmHg, calculate the mole \fraction of urea in the solution.

Correct A. 0.025

B. 0.050

C. 0.100

D. 0.200

Correct Answer: A

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Question 17 View Details

Identify the type of reaction that occurs when a solution of sodium hydroxide is added to a solution of hydrochloric acid.

Correct A. Neutralization reaction

B. Oxidation-reduction reaction

C. Precipitation reaction

D. Combustion reaction

Correct Answer: A

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Question 18 View Details

A 2.50 L flask contains 0.500 mol of an ideal gas at a temperature of 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 x 10^2 Pa

Correct B. 2.02 x 10^2 Pa

C. 3.03 x 10^2 Pa

D. 4.04 x 10^2 Pa

Correct Answer: B

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Question 19 View Details

A 25.0 mL sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5 mL

Correct B. 25.0 mL

C. 37.5 mL

D. 50.0 mL

Correct Answer: B

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Question 20 View Details

A diagram of a titration setup is shown below. Identify the type of titration being performed.

Correct A. Acid-base titration

B. Redox titration

C. Complexation titration

D. Precipitation titration

Correct Answer: A

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Question 21 View Details

The atomic radius of an element in a period increases as you move from left to right, but decreases as you move down a group. Explain this periodic tr\end.

A. Due to the increase in nuclear charge, the electrons are pulled closer to the nucleus.

Correct B. As you move down a group, the number of energy levels increases, resulting in a larger atomic radius.

C. The atomic radius increases as you move down a group due to the increase in the number of energy levels.

D. The atomic radius decreases as you move down a group due to the increase in nuclear charge.

Correct Answer: B

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Question 22 View Details

A solution contains 2.5 g of NaCl in 100 mL of water. Calculate the molarity of the solution.

Correct A. 0.00025 M

B. 0.0025 M

C. 0.025 M

D. 0.25 M

Correct Answer: A

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Question 23 View Details

The diagram below shows a titration setup. Identify the part labeled 'A'.

Correct A. Burette

B. Conical flask

C. Pipette

D. Thermometer

Correct Answer: A

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Question 24 View Details

A hydrocarbon has the molecular formula C4H10. What is its IUPAC name?

A. Bu\tane

B. Isobu\tane

Correct C. n-Bu\tane

D. 2-Methylpropane

Correct Answer: C

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Question 25 View Details

A metal oxide has the formula M2O3. What is the oxidation state of the metal?

Correct A. +3

B. +5

C. +7

D. +9

Correct Answer: A

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