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POST UTME IMS U 2019 Chemistry | Objective

Are you preparing for POST UTME IMS U 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 pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 2

Calculate the molar solubility of AgCl in a 0.1 M solution of NaCl.

Correct A. 0.01 M

B. 0.1 M

C. 1 M

D. 10 M

Correct Answer: A

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Question 3

A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas.

A. 1 atm

Correct B. 2 atm

C. 3 atm

D. 4 atm

Correct Answer: B

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Question 4

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

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 5

A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the volume of the gas at 37°C.

A. 2.5 L

Correct B. 3 L

C. 4 L

D. 5 L

Correct Answer: B

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Question 6

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

A. +2

Correct B. +3

C. +6

D. +7

Correct Answer: B

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Question 7

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

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 8

The reaction between H_2O and CO is given by the equation: H_2O + CO → H_2 + CO_2. What is the value of ΔH for this reaction?

Correct A. -110 kJ/mol

B. +110 kJ/mol

C. -200 kJ/mol

D. +200 kJ/mol

Correct Answer: A

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Question 9

A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?

A. To measure the volume of the acid

Correct B. To measure the volume of the base

C. To mix the acid and base

D. To measure the pH of the solution

Correct Answer: B

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Question 10

The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 10 years?

A. 50 g

Correct B. 75 g

C. 87.5 g

D. 100 g

Correct Answer: B

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Question 11

Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the equation: 2H2 + O2 → 2H2O.

A. 1.25 moles

B. 2.5 moles

Correct C. 3.75 moles

D. 5 moles

Correct Answer: C

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Question 12

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol.

Correct A. -285.8 kJ/mol

B. -285.6 kJ/mol

C. -285.9 kJ/mol

D. -286.0 kJ/mol

Correct Answer: A

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Question 13

A 2.5 M solution of NaOH is mixed with a 2.5 M solution of HCl. What is the resulting pH of the solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 14

The diagram below shows a titration setup.

A. The burette contains NaOH.

Correct B. The burette contains HCl.

C. The beaker contains NaOH.

D. The beaker contains HCl.

Correct Answer: B

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Question 15

A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. What is the resulting pH of the solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 16

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. -1206.61 kJ/mol

C. -1206.59 kJ/mol

D. -1206.62 kJ/mol

Correct Answer: A

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Question 17

A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. 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 18

A sample of CO2 gas at 25°C and 1 atm is collected over water in a flask. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of CO2?

Correct A. 0.76 atm

B. 0.77 atm

C. 0.78 atm

D. 0.79 atm

Correct Answer: A

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Question 19

A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the concentration of the resulting solution?

A. 1.00 M

Correct B. 2.00 M

C. 3.00 M

D. 4.00 M

Correct Answer: B

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Question 20

A 1.00 M solution of Ca(OH)2 is mixed with a 1.00 M solution of HCl. 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

At 273 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?

A. 44.8 L

Correct B. 45.6 L

C. 46.4 L

D. 47.2 L

Correct Answer: B

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Question 22

A 2.5 M solution of NaCl is prepared by dissolving 25 g of NaCl in 1 L of water. What is the molarity of the solution?

A. 1.0 M

B. 2.0 M

Correct C. 2.5 M

D. 3.0 M

Correct Answer: C

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Question 23

The density of a subs\tance is 2.5 g/mL. If 5 mL of the subs\tance has a mass of 12.5 g, what is the molar mass of the subs\tance?

A. 25 g/mol

B. 50 g/mol

Correct C. 75 g/mol

D. 100 g/mol

Correct Answer: C

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Question 24

A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1 L of water. What is the molarity of the solution?

Correct A. 1.0 M

B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: A

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Question 25

The boiling point of a solution is 102.5°C. If the boiling point of the pure solvent is 100°C, what is the molality of the solution?

A. 0.1 m

B. 0.5 m

Correct C. 1.0 m

D. 2.0 m

Correct Answer: C

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