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POST UTME IGBINEDION UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1

Calculate the molar mass of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.

A. 12.0 g/mol

B. 24.0 g/mol

C. 36.0 g/mol

D. 48.0 g/mol

Question 2

A solution of 0.1 M NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is added, what is the pH of the solution?

A. 1

B. 2

C. 3

D. 4

Question 3

A solution of 2 M HCl is mixed with a solution of 1 M NaOH. What is the pH of the resulting solution?

A. 1

B. 2

C. 3

D. 4

Question 4

A 100 mL sample of a 0.5 M solution of potassium nitrate (KNO3) is mixed with a 100 mL sample of a 0.5 M solution of ammonium chloride (NH4Cl). What is the concentration of the resulting solution?

A. 0.25 M

B. 0.5 M

C. 0.75 M

D. 1.0 M

Question 5

A 2.5 L flask contains 0.25 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas?

A. 1.01 x 10^5 Pa

B. 2.53 x 10^5 Pa

C. 3.01 x 10^5 Pa

D. 4.02 x 10^5 Pa

Question 6

The reaction of sodium (Na) with water (H2O) produces sodium hydroxide (NaOH) and hydrogen gas (H2). Write the balanced chemical equation for this reaction.

A. 2Na + 2H2O → 2NaOH + H2

B. 2Na + H2O → 2NaOH + 2H2

C. Na + H2O → NaOH + H2

D. 2Na + H2O → NaOH + 2H2

Question 7

A redox reaction involves the oxidation of Fe^2+ to Fe^3+ and the reduction of MnO4^- to Mn^2+. What is the half-reaction for the oxidation of Fe^2+?

A. \text{Fe}^2+ \rightarrow \text{Fe}^3+ + \text{e}^-

B. \text{Fe}^3+ \rightarrow \text{Fe}^2+ + \text{e}^-

C. \text{Fe}^2+ + \text{e}^- \rightarrow \text{Fe}^3+

D. \text{Fe}^3+ + \text{e}^- \rightarrow \text{Fe}^2+

Question 8

A solution contains 0.10 M NaCl. What is the concentration of Cl- ions?

A. 0.05 M

B. 0.10 M

C. 0.15 M

D. 0.20 M

Question 9

A 25 mL sample of a 0.5 M solution of potassium chloride (KCl) is diluted to a total volume of 100 mL. What is the concentration of the resulting solution?

A. 0.1 M

B. 0.2 M

C. 0.3 M

D. 0.4 M

Question 10

The half-life of a radioactive subs\tance is 5.0 years. If 100 g of the subs\tance is initially present, how much will remain after 20 years?

A. 6.25 g

B. 12.5 g

C. 25.0 g

D. 50.0 g

Question 11

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

A. To measure the volume of the solution

B. To measure the pH of the solution

C. To mix the solutions

D. To filter the solution

Question 12

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. 0.01 M

B. 0.02 M

C. 0.03 M

D. 0.04 M

Question 13

The s\tandard reduction potential of the couple Zn2+/Zn is -0.76 V. If a zinc electrode is connected to a copper electrode with a s\tandard reduction potential of +0.34 V, what is the s\tandard cell potential?

A. -1.10 V

B. -0.42 V

C. +0.58 V

D. +1.18 V

Question 14

A 100 mL sample of a 0.5 M solution of sodium nitrate (NaNO3) is mixed with a 100 mL sample of a 0.5 M solution of ammonium chloride (NH4Cl). What is the concentration of the resulting solution?

A. 0.25 M

B. 0.5 M

C. 0.75 M

D. 1.0 M

Question 15

Determine the concentration of a solution containing 25.0 mL of 0.1 M HCl diluted to 100.0 mL.

A. 0.05 M

B. 0.1 M

C. 0.2 M

D. 0.5 M

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POST UTME IGBINEDION UNIVERSITY 2021 Chemistry | Objective

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