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POST UTME AFE BABALOLA UNIVERSITY 2017 Chemistry | Objective

Are you preparing for POST UTME AFE BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of moles of nitrogen gas (N2) produced when 2.5 g of ammonia (NH3) is decomposed at cons\tant pressure and temperature.

A. 0.05 mol

Correct B. 0.1 mol

C. 0.15 mol

D. 0.2 mol

Correct Answer: B

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Question 2

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

A. 101325 Pa

Correct B. 202650 Pa

C. 303875 Pa

D. 405100 Pa

Correct Answer: B

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Question 3

A solution contains 0.1 M sodium chloride (NaCl) and 0.2 M calcium chloride (CaCl2). Calculate the molarity of the chloride ions \( Cl- \) in the solution.

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 4

A 2.0 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the number of molecules of the gas.

A. 1.0 x 10^22

Correct B. 2.0 x 10^22

C. 3.0 x 10^22

D. 4.0 x 10^22

Correct Answer: B

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Question 5

A 1.5 L flask contains 0.3 mol of an ideal gas at 27°C. Calculate the pressure of the gas in pascals.

A. 101325 Pa

Correct B. 202650 Pa

C. 303875 Pa

D. 405100 Pa

Correct Answer: B

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Question 6

The reaction of zinc metal with copper(II) sulfate solution is a classic example of a redox reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.

Correct A. Zn + CuSO4 → ZnSO4 + Cu

B. Zn + CuSO4 → ZnSO4 + Cu2O

C. Zn + CuSO4 → ZnO + Cu

D. Zn + CuSO4 → ZnSO4 + CuSO3

Correct Answer: A

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Question 7

The following diagram shows a setup for electrolysis of water. Identify the type of electrode used for the anode and the cathode.

Correct A. Anode: Platinum, Cathode: Platinum

B. Anode: Iron, Cathode: Platinum

C. Anode: Platinum, Cathode: Iron

D. Anode: Iron, Cathode: Iron

Correct Answer: A

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Question 8

The following table shows the atomic radii of some elements in the periodic table. Identify the element with the largest atomic radius.

Correct A. Group 1

B. Group 2

C. Group 17

D. Group 18

Correct Answer: A

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Question 9

The following diagram shows a setup for a titration experiment. Identify the subs\tance being titrated.

A. Acid

Correct B. Base

C. Salt

D. Water

Correct Answer: B

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Question 10

The following diagram shows a setup for a chromatography experiment. Identify the subs\tance being separated.

Correct A. Mixture of compounds

B. Single compound

C. Element

D. Mixture of elements

Correct Answer: A

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Question 11

Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g), given that the initial concentrations of NO and O2 are 0.5 M and 0.2 M, respectively, and the rate of reaction is 0.01 M/s after 10 minutes. The rate law is first order with respect to NO and second order with respect to O2.

A. 0.05 M^-1 s^-1

Correct B. 0.1 M^-1 s^-1

C. 0.2 M^-1 s^-1

D. 0.5 M^-1 s^-1

Correct Answer: B

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Question 12

A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

Correct A. 1.01 × 10^5 Pa

B. 2.02 × 10^5 Pa

C. 3.03 × 10^5 Pa

D. 4.04 × 10^5 Pa

Correct Answer: A

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Question 13

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mol of C(s) to form CO2(g).

Correct A. -393.5 kJ/mol

B. -393.5 kJ/mol + 0.5 kJ/mol

C. -393.5 kJ/mol - 0.5 kJ/mol

D. -393.5 kJ/mol + 1 kJ/mol

Correct Answer: A

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Question 14

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

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 15

A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

Correct A. 1.01 × 10^5 Pa

B. 2.02 × 10^5 Pa

C. 3.03 × 10^5 Pa

D. 4.04 × 10^5 Pa

Correct Answer: A

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Question 16

In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?

Correct A. Cu

B. Cu2+

C. H2

D. O2

Correct Answer: A

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Question 17

What is the major product of the reaction between 2-methylpropane and chlorine?

A. 2-chloro-2-methylpropane

Correct B. 2,2-dichloro-2-methylpropane

C. 2-chloro-2-methyl-1-propane

D. 2-chloro-2-methyl-2-propane

Correct Answer: B

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Question 18

The rate cons\tant for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?

A. 0.05 M

Correct B. 0.025 M

C. 0.1 M

D. 0.5 M

Correct Answer: B

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Question 19

A 10% solution of sodium chloride is prepared by dissolving 10 g of NaCl in 90 g of water. What is the molarity of the solution?

Correct A. 0.1 M

B. 0.5 M

C. 1 M

D. 5 M

Correct Answer: A

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Question 20

The diagram below shows the titration of a strong acid with a strong base. What is the pH of the solution after the equivalence point?

A. 7

Correct B. 10

C. 12

D. 14

Correct Answer: B

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