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POST UTME RSU 2022 Chemistry | Objective

Are you preparing for POST UTME RSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the molar solubility of BaSO4 in 0.1 M Na2SO4 solution, given that the solubility product cons\tant (Ksp) of BaSO4 is 1.1 × 10^\( -10 \) and the solubility product cons\tant (Ksp) of Na2SO4 is 2.5 × 10^\( -3 \).

A. 1.0 × 10^\( -5 \) M

Correct B. 1.1 × 10^\( -5 \) M

C. 1.2 × 10^\( -5 \) M

D. 1.3 × 10^\( -5 \) M

Correct Answer: B

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Question 2

A 0.1 M solution of NaOH is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of NaOH if the initial concentration of HCl is 0.1 M.

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 3

A polymer has a molecular weight of 100,000 g/mol. If 10 g of the polymer is dissolved in 100 mL of water, what is the concentration of the polymer solution in g/L?

A. 0.1 g/L

Correct B. 1.0 g/L

C. 10 g/L

D. 100 g/L

Correct Answer: B

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Question 4

A 1.0 M solution of glu\cose is diluted to 0.1 M. What is the volume of the solution that is required to obtain 100 mL of the diluted solution?

A. 10 mL

B. 20 mL

Correct C. 50 mL

D. 100 mL

Correct Answer: C

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Question 5

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the initial concentration of HCl if the initial concentration of NaOH is 0.1 M.

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 6

Determine the number of moles of electrons transferred in the electrolysis of 2.5 L of 0.5 M H2SO4.

A. 1.25 mol

B. 2.5 mol

Correct C. 5.0 mol

D. 6.25 mol

Correct Answer: C

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Question 7

A 2.0 g sample of a polymer is dissolved in 50 mL of solvent. Calculate the molar mass of the polymer if the osmotic pressure is 1.5 atm at 25°C.

A. 100 g/mol

B. 200 g/mol

Correct C. 500 g/mol

D. 1000 g/mol

Correct Answer: C

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Question 8

A 1.0 L solution of 0.1 M NaOH is mixed with 1.0 L of 0.1 M HCl. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 7

D. 10

Correct Answer: B

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Question 9

A 2.0 g sample of a metal is heated in a crucible until it melts. Calculate the energy required to melt the metal if the latent heat of fusion is 100 J/g.

A. 200 J

B. 400 J

Correct C. 600 J

D. 800 J

Correct Answer: C

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Question 10

A 1.0 L solution of 0.1 M H2SO4 is mixed with 1.0 L of 0.1 M NaOH. Calculate the number of moles of H2O produced.

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 11

The reaction between nitrogen dioxide and water is a classic example of an oxidation-reduction reaction. What is the oxidation state of nitrogen in NO2?

A. II

B. III

Correct C. IV

D. V

Correct Answer: C

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Question 12

A 2.5 M solution of HCl is titrated with a 1.0 M solution of NaOH. What is the pH of the solution after 25 mL of NaOH has been added?

A. 1.0

B. 1.5

Correct C. 2.0

D. 2.5

Correct Answer: C

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Question 13

The diagram below shows a simple electrolysis setup. What is the product at the cathode?

Correct A. H2

B. O2

C. H2O

D. NaOH

Correct Answer: A

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Question 14

A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. What is the pH of the solution after 50 mL of HCl has been added?

A. 6.0

B. 6.5

Correct C. 7.0

D. 7.5

Correct Answer: C

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Question 15

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

Correct A. to measure the volume of a solution

B. to measure the mass of a subs\tance

C. to measure the temperature of a solution

D. to measure the pH of a solution

Correct Answer: A

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Question 16

For the reaction 2NO(g) + O2(g) → 2NO2(g), the rate cons\tant (k) is 0.05 s^-1 at 298 K. Calculate the rate of reaction (r) when [NO] = 0.1 M, [O2] = 0.05 M, and the volume of the reaction mixture is 1 L.

Correct A. 0.0025 M s^-1

B. 0.005 M s^-1

C. 0.01 M s^-1

D. 0.025 M s^-1

Correct Answer: A

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Question 17

A 0.1 M solution of a weak acid HA has a pH of 4.5. Calculate the concentration of the acid (HA) and its conjugate base \( A^- \) at equilibrium.

Correct A. 0.01 M, 0.09 M

B. 0.05 M, 0.05 M

C. 0.1 M, 0.1 M

D. 0.5 M, 0.5 M

Correct Answer: A

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Question 18

A 2.0 g sample of a metal carbonate (M2CO3) is heated to produce a metal oxide (MO). If the mass of the metal oxide produced is 1.2 g, calculate the molar mass of the metal (M).

A. 40 g/mol

Correct B. 60 g/mol

C. 80 g/mol

D. 100 g/mol

Correct Answer: B

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Question 19

A 1.0 L solution of a 0.1 M NaCl is mixed with 1.0 L of a 0.2 M NaCl solution. Calculate the resulting concentration of NaCl and the osmotic pressure of the solution at 298 K.

Correct A. 0.15 M, 2.5 atm

B. 0.2 M, 3.0 atm

C. 0.25 M, 3.5 atm

D. 0.3 M, 4.0 atm

Correct Answer: A

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Question 20

A 2.0 g sample of a metal hydroxide (MOH) is dissolved in water to produce a solution with a pH of 10.5. Calculate the molar mass of the metal (M).

A. 40 g/mol

B. 60 g/mol

Correct C. 80 g/mol

D. 100 g/mol

Correct Answer: C

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Question 21

Determine the hybridization of the central atom in the molecule CH3Cl.

Correct A. sp3

B. sp2

C. sp

D. dsp3

Correct Answer: A

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Question 22

A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 23

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

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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Question 24

A sample of glu\cose (C6H12O6) is burned in a combustion calorimeter. What is the balanced equation for the reaction?

Correct A. C6H12O6 + 6O2 → 6CO2 + 6H2O

B. C6H12O6 + 6H2O → 6CO2 + 12H2

C. C6H12O6 + 6CO2 → 6H2O + 12CO

D. C6H12O6 + 6H2O → 6CO + 12H2

Correct Answer: A

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Question 25

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. What is the purpose of the pipette?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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