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POST UTME REDEEMERS UNIVERSITY 2019 Chemistry | Objective

Are you preparing for POST UTME REDEEMERS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of moles of carbon dioxide gas produced when 2.5 liters of carbon monoxide gas at 27°C and 1 atm is heated to 127°C at cons\tant pressure.

A. 0.25 mol

B. 0.5 mol

Correct C. 1.0 mol

D. 1.25 mol

Correct Answer: C

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Question 2

A 2.5 M solution of sodium hydroxide is mixed with a 1.0 M solution of hydrochloric acid. 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 3

The diagram below shows a titration setup.

Correct A. The burette contains the acid.

B. The beaker contains the acid.

C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: A

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Question 4

A sample of hydrogen gas at 25°C and 1 atm is collected over water at 25°C. What is the partial pressure of the hydrogen gas?

A. 0.5 atm

Correct B. 0.75 atm

C. 1.0 atm

D. 1.25 atm

Correct Answer: B

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Question 5

The diagram below shows a chemical apparatus setup.

Correct A. The test tube contains the acid.

B. The burette contains the acid.

C. The test tube contains the base.

D. The burette contains the base.

Correct Answer: A

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Question 6

The reaction of nitrogen dioxide with water produces nitric acid and nitric oxide. Write the balanced chemical equation for this reaction.

A. 4NO2(g) + 2H2O(l) → 4HNO3(aq) + O2(g)

Correct B. 2NO2(g) + 2H2O(l) → 2HNO3(aq) + O2(g)

C. NO2(g) + H2O(l) → HNO3(aq) + NO(g)

D. 4NO2(g) + 2H2O(l) → 4HNO3(aq)

Correct Answer: B

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Question 7

The diagram below shows the structure of a molecule. Identify the type of bond between atoms A and B.

A. Sigma (σ) bond

B. Pi (π) bond

Correct C. Sigma (σ) and Pi (π) bond

D. Hydrogen bond

Correct Answer: C

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Question 8

The graph below shows the relationship between pressure and volume of a gas. What is the type of gas law that describes this relationship?

Correct A. Boyle's Law

B. Charles' Law

C. Avogadro's Law

D. Ideal Gas Law

Correct Answer: A

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Question 9

The diagram below shows the structure of a periodic table. Identify the group to which the element with atomic number 16 belongs.

A. Group 1

B. Group 2

Correct C. Group 16

D. Group 18

Correct Answer: C

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Question 10

The reaction of sodium with water produces sodium hydroxide and hydrogen gas. Write the balanced chemical equation for this reaction.

Correct A. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

B. Na(s) + H2O(l) → NaOH(aq) + H2(g)

C. 2Na(s) + H2O(l) → 2NaOH(aq)

D. Na(s) + 2H2O(l) → NaOH(aq) + H2(g)

Correct Answer: A

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Question 11

Determine the oxidation state of the underlined atom in the compound [Cr\( H_2O \)_5Cl]Cl_2.

Correct A. +3

B. +2

C. +6

D. +1

Correct Answer: A

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Question 12

A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the volume of HCl 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 13

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

Correct A. Burette

B. Beaker

C. Conical Flask

D. Test Tube

Correct Answer: A

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Question 14

A sample of nitrogen gas occupies a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 298 K. Calculate the number of moles of nitrogen gas present.

A. 0.010 mol

Correct B. 0.020 mol

C. 0.030 mol

D. 0.040 mol

Correct Answer: B

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Question 15

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. Identify the component labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Test Tube

Correct Answer: A

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Question 16

Determine the number of moles of nitrogen gas (N2) at STP, given that the volume of the gas is 2.50 L and the temperature is 273.15 K.

Correct A. 0.0500 mol

B. 0.100 mol

C. 0.200 mol

D. 0.500 mol

Correct Answer: A

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Question 17

A 25.0-mL sample of a polymer solution contains 1.50 g of polymer. If the density of the polymer is 1.20 g/mL, what is the molar mass of the polymer?

A. 500 g/mol

Correct B. 1000 g/mol

C. 2000 g/mol

D. 5000 g/mol

Correct Answer: B

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Question 18

A 10.0-mL sample of a solution containing 0.500 M NaCl is titrated with 0.100 M AgNO3. What is the concentration of the AgCl precipitate formed?

Correct A. 0.0500 M

B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: A

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Question 19

A 50.0-mL sample of a solution containing 0.100 M HCl is mixed with 50.0 mL of a solution containing 0.0500 M NaOH. What is the pH of the resulting solution?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 20

A 100-mL sample of a solution containing 0.500 M H2SO4 is titrated with 0.100 M NaOH. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 21

Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \) and the temperature dep\endence of the dissociation cons\tant is described by the equation: \log(K) = -0.5 \log(T) + 1.5.

Correct A. 1.0

B. 2.0

C. 3.0

D. 4.0

Correct Answer: A

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Question 22

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The resulting solution has a vis\cosity of 0.8 Pa·s. If the density of the polymer is 1.2 g/mL, calculate the number-average molecular weight (Mn) of the polymer.

A. 1000

B. 2000

Correct C. 3000

D. 4000

Correct Answer: C

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Question 23

A 50 mL sample of a 0.1 M solution of sodium hydroxide (NaOH) is titrated with a 0.1 M solution of hydrochloric acid (HCl). If the equivalence point is reached at 25 mL of HCl, calculate the concentration of the NaOH solution.

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 24

A 1.0 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. If the molar mass of the hydrocarbon is 120 g/mol, calculate the s\tandard enthalpy of combustion (ΔHc) of the hydrocarbon.

A. -100 kJ/mol

B. -120 kJ/mol

Correct C. -140 kJ/mol

D. -160 kJ/mol

Correct Answer: C

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Question 25

A 0.5 M solution of a weak acid (HA) has a pH of 4.5. If the dissociation cons\tant of the acid is 10^\( -5 \), calculate the concentration of the acid (HA) in the solution.

A. 0.01 M

Correct B. 0.05 M

C. 0.1 M

D. 0.2 M

Correct Answer: B

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