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POST UTME ACHIEVERS UNIVERSITY 2024 Chemistry | Objective

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Question 1

Determine the concentration of a 0.5 M solution of NaOH in g/L, given that the molar mass of NaOH is 40 g/mol.

A. 20 g/L

Correct B. 40 g/L

C. 60 g/L

D. 80 g/L

Correct Answer: B

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Question 2

A 2.5 L sample of a gas at 27°C and 1 atm is collected over water at 25°C. Calculate the partial pressure of the gas.

A. 0.95 atm

Correct B. 1.05 atm

C. 1.10 atm

D. 1.15 atm

Correct Answer: B

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Question 3

A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 25 mL

Correct B. 50 mL

C. 75 mL

D. 100 mL

Correct Answer: B

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Question 4

A diagram of a titration setup is shown below.

Correct A. The burette contains NaOH.

B. The beaker contains HCl.

C. The burette contains HCl.

D. The beaker contains NaOH.

Correct Answer: A

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Question 5

A diagram of a gas collection apparatus is shown below.

Correct A. The apparatus is used to collect a gas over water.

B. The apparatus is used to collect a gas over mercury.

C. The apparatus is used to collect a gas over air.

D. The apparatus is used to collect a gas over vacuum.

Correct Answer: A

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Question 6

Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 7

The reaction between H2S and O2 produces SO2 and H2O. Write the balanced chemical equation.

Correct A. H2S + O2 → SO2 + H2O

B. H2S + O2 → SO3 + H2O

C. H2S + O2 → SO2 + H2O2

D. H2S + O2 → SO4 + H2O

Correct Answer: A

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Question 8

A 25 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the number of moles of NaOH required.

A. 0.0025

Correct B. 0.005

C. 0.0075

D. 0.01

Correct Answer: B

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Question 9

The diagram below shows a titration setup.

Correct A. The burette contains HCl.

B. The beaker contains NaOH.

C. The burette contains NaOH.

D. The beaker contains HCl.

Correct Answer: A

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Question 10

The diagram below shows a titration setup.

A. The burette contains HCl.

Correct B. The beaker contains NaOH.

C. The burette contains NaOH.

D. The beaker contains HCl.

Correct Answer: B

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Question 11

Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^-10.

A. 1.0 × 10^-5 M

Correct B. 2.0 × 10^-5 M

C. 3.0 × 10^-5 M

D. 4.0 × 10^-5 M

Correct Answer: B

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Question 12

A 25 mL sample of 0.1 M HCl is mixed with 25 mL of 0.1 M NaOH. Calculate the pH of the resulting solution.

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 13

The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much will remain after 20 days?

A. 50 mg

B. 25 mg

C. 12.5 mg

Correct D. 6.25 mg

Correct Answer: D

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Question 14

A 10 mL sample of 0.1 M H2SO4 is mixed with 10 mL of 0.1 M NaOH. Calculate the number of moles of H2O produced.

A. 0.02 mol

B. 0.04 mol

Correct C. 0.06 mol

D. 0.08 mol

Correct Answer: C

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Question 15

A 50 mL sample of 0.1 M HCl is mixed with 50 mL of 0.1 M NaOH. Calculate the pH of the resulting solution.

A. 1.0

B. 2.0

C. 3.0

Correct D. 4.0

Correct Answer: D

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Question 16

A sample of gas at 25°C and 1 atm is heated to 50°C. If the volume of the gas is doubled, what is the new pressure?

A. 2 atm

B. 1 atm

C. 0.5 atm

Correct D. 4 atm

Correct Answer: D

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Question 17

A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required?

A. 10 mL

Correct B. 20 mL

C. 30 mL

D. 40 mL

Correct Answer: B

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Question 18

A 2.0 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. If the mass of the crucible and metal is 5.0 g, what is the percentage of the metal that has been lost?

A. 20%

B. 30%

Correct C. 40%

D. 50%

Correct Answer: C

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Question 19

A solution of HCl is prepared by dissolving 10 g of HCl in 100 mL of water. If the density of the solution is 1.2 g/mL, what is the concentration of the solution in molarity?

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 20

A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required?

A. 10 mL

Correct B. 20 mL

C. 30 mL

D. 40 mL

Correct Answer: B

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Question 21

The reaction between sulfuric acid (H2SO4) and sodium hydroxide (NaOH) is a classic example of a double displacement reaction. Write the balanced chemical equation for this reaction, including the states of matter for each reac\tant and product.

Correct A. H2SO4 (aq) + NaOH (aq) → Na2SO4 (aq) + H2O (l)

B. H2SO4 (l) + NaOH (s) → Na2SO4 (s) + H2O (g)

C. H2SO4 (g) + NaOH (aq) → Na2SO4 (aq) + H2O (l)

D. H2SO4 (aq) + NaOH (s) → Na2SO4 (s) + H2O (g)

Correct Answer: A

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Question 22

A 2.5 M solution of calcium chloride (CaCl2) is prepared by dissolving 1.25 g of CaCl2 in 100 mL of water. What is the molarity of the solution?

Correct A. 2.5 M

B. 1.25 M

C. 5.0 M

D. 10.0 M

Correct Answer: A

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Question 23

A 10% solution of sodium carbonate (Na2CO3) is prepared by dissolving 10 g of Na2CO3 in 100 mL of water. What is the molarity of the solution?

Correct A. 0.1 M

B. 1.0 M

C. 10.0 M

D. 100.0 M

Correct Answer: A

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Question 24

A 1.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the molarity of the solution?

A. 0.1 M

Correct B. 1.0 M

C. 10.0 M

D. 100.0 M

Correct Answer: B

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Question 25

A 5.0 M solution of sodium hydroxide (NaOH) is prepared by dissolving 5.0 g of NaOH in 100 mL of water. What is the molarity of the solution?

A. 0.5 M

B. 1.0 M

Correct C. 5.0 M

D. 10.0 M

Correct Answer: C

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