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POST UTME MOUNTAIN TOP UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME MOUNTAIN TOP UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of unpaired electrons in the ground state of the chromium ion, Cr³⁺.

Correct A. 3

B. 4

C. 5

D. 6

Correct Answer: A

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Question 2

A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 1.8 M solution of hydrochloric acid (HCl). What is the resulting concentration of the sodium chloride (NaCl) solution?

A. 1.65 M

Correct B. 2.15 M

C. 2.65 M

D. 3.15 M

Correct Answer: B

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Question 3

A diagram of a titration setup is shown below.

A. The burette contains the acid.

B. The beaker contains the acid.

Correct C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: C

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Question 4

Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2Al(s) + Fe₂O₃(s) → 2Fe(s) + Al₂O₃(s). The s\tandard enthalpy of formation (ΔH°f) values are: Al₂O₃(s) = -1675.7 kJ/mol, Al(s) = 0 kJ/mol, Fe₂O₃(s) = -825.4 kJ/mol, and Fe(s) = 0 kJ/mol.

Correct A. -1547.9 kJ/mol

B. -1547.1 kJ/mol

C. -1546.3 kJ/mol

D. -1545.5 kJ/mol

Correct Answer: A

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Question 5

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below.

A. The burette contains the acid.

B. The beaker contains the acid.

Correct C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: C

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Question 6

In a reaction between hydrochloric acid and sodium hydroxide, the products are water and sodium chloride. What is the type of reaction?

A. Endothermic reaction

B. Exothermic reaction

Correct C. Neutralization reaction

D. Oxidation reaction

Correct Answer: C

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Question 7

A 2.5 g sample of an organic compound is dissolved in 25 mL of ethanol. What is 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 8

A gas at 300 K and 1 atm expands to occupy a volume of 2 L. What is the new pressure?

A. 0.5 atm

B. 1 atm

C. 1.5 atm

Correct D. 2 atm

Correct Answer: D

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Question 9

A 10 mL sample of a solution containing 0.5 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the titration?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 10

A 2.0 g sample of an organic compound is burned in a bomb calorimeter. The heat released is 12.5 kJ. What is the enthalpy change per mole of the compound?

A. -6000 J/mol

B. -8000 J/mol

C. -10000 J/mol

Correct D. -12000 J/mol

Correct Answer: D

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Question 11

At 298 K, the s\tandard enthalpy change \( ΔH^circ \) for the reaction N_2(g) + 3H_2(g) → 2NH_3(g) is -92.5 kJ/mol. Calculate the s\tandard entropy change \( ΔS^circ \) for this reaction.

Correct A. -290 J/mol*K

B. -290 J/mol*K

C. -290 J/mol*K

D. -290 J/mol*K

Correct Answer: A

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Question 12

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

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 13

The s\tandard enthalpy of formation \( ΔH^circ_f \) of CO_2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H_2O(l) if the s\tandard enthalpy of formation of H_2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O_2(g) is 0 kJ/mol.

Correct A. -285.8 kJ/mol

B. -285.8 kJ/mol

C. -285.8 kJ/mol

D. -285.8 kJ/mol

Correct Answer: A

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Question 14

The diagram below shows a chemical apparatus setup. What is the purpose of the condenser?

Correct A. To cool the gas

B. To heat the gas

C. To mix the gas and liquid

D. To measure the pressure of the gas

Correct Answer: A

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Question 15

The s\tandard entropy change \( ΔS^circ \) for the reaction 2H_2(g) + O_2(g) → 2H_2O(l) is -198.3 J/mol*K. Calculate the s\tandard enthalpy change \( ΔH^circ \) for this reaction at 298 K.

Correct A. -59.2 kJ/mol

B. -59.2 kJ/mol

C. -59.2 kJ/mol

D. -59.2 kJ/mol

Correct Answer: A

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Question 16

The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of the copper ion in the product?

Correct A. 0

B. +2

C. -2

D. +1

Correct Answer: A

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Question 17

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the reaction is complete?

A. 1

Correct B. 7

C. 10

D. 12

Correct Answer: B

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Question 18

The solubility of silver chloride (AgCl) in water is 1.2 × 10^\( -10 \) mol/L. What is the molar solubility of AgCl?

Correct A. 1.2 × 10^\( -10 \)

B. 1.2 × 10^\( -9 \)

C. 1.2 × 10^\( -8 \)

D. 1.2 × 10^\( -7 \)

Correct Answer: A

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Question 19

The reaction of propane (C3H8) with oxygen (O2) is represented by the equation: C3H8(l) + 5O2(g) → 3CO2(g) + 4H2O(l). What is the balanced equation for the reaction?

Correct A. C3H8(l) + 5O2(g) → 3CO2(g) + 4H2O(l)

B. C3H8(l) + 4O2(g) → 3CO2(g) + 4H2O(l)

C. C3H8(l) + 6O2(g) → 3CO2(g) + 4H2O(l)

D. C3H8(l) + 3O2(g) → 3CO2(g) + 4H2O(l)

Correct Answer: A

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Question 20

A 10.0 g sample of aluminum (Al) is reacted with 20.0 mL of 1.00 M HCl. What is the limiting reac\tant?

A. Al

Correct B. HCl

C. Neither

D. Both

Correct Answer: B

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Question 21

The electrolysis of a solution of CuSO4 in water produces Cu metal and SO2 gas. If the current used is 2.5 A and the time taken is 3 hours, calculate the mass of Cu metal deposited at the cathode.

A. 0.25 kg

Correct B. 0.5 kg

C. 1 kg

D. 2 kg

Correct Answer: B

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Question 22

A solution of HCl is titrated with a solution of NaOH. If 25 cm3 of the HCl solution requires 35 cm3 of the NaOH solution for neutralization, calculate the concentration of the HCl solution.

A. 0.1 M

Correct B. 0.2 M

C. 0.5 M

D. 1 M

Correct Answer: B

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Question 23

The half-life of a radioactive subs\tance is 5 years. If the initial activity is 1000 Bq, calculate the activity after 10 years.

A. 125 Bq

B. 250 Bq

Correct C. 500 Bq

D. 1000 Bq

Correct Answer: C

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Question 24

A metal rod of length 20 cm and radius 0.5 cm is heated from 20°C to 100°C. Calculate the increase in length.

A. 0.1 cm

B. 0.2 cm

Correct C. 0.5 cm

D. 1 cm

Correct Answer: C

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Question 25

A solution of H2SO4 is titrated with a solution of NaOH. If 30 cm3 of the H2SO4 solution requires 40 cm3 of the NaOH solution for neutralization, calculate the concentration of the H2SO4 solution.

A. 0.2 M

B. 0.5 M

Correct C. 1 M

D. 2 M

Correct Answer: C

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