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POST UTME LEAD CITY UNIVERSITY 2022 Chemistry | Objective

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Question 1

A 0.5 M solution of a weak base, B, is titrated with 0.5 M HCl. If 25 mL of the base is required to neutralize 25 mL of 0.5 M HCl, what is the value of Kb for the base?

Correct A. 1.0 x 10^-5

B. 1.0 x 10^-4

C. 1.0 x 10^-3

D. 1.0 x 10^-2

Correct Answer: A

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Question 2

A metal M reacts with chlorine gas to form a white solid product. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of MCl2 is obtained from 1.5 g of M, what is the molar mass of M?

A. 50 g/mol

Correct B. 75 g/mol

C. 100 g/mol

D. 125 g/mol

Correct Answer: B

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Question 3

A 2.0 M solution of a weak acid, HA, is titrated with 2.0 M NaOH. If 20 mL of the acid is required to neutralize 20 mL of 2.0 M NaOH, what is the value of Ka for the acid?

A. 1.0 x 10^-5

B. 1.0 x 10^-4

Correct C. 1.0 x 10^-3

D. 1.0 x 10^-2

Correct Answer: C

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Question 4

A 0.5 M solution of a weak base, B, is titrated with 0.5 M HCl. If 25 mL of the base is required to neutralize 25 mL of 0.5 M HCl, what is the pH of the solution after the titration?

A. 7.0

B. 7.5

C. 8.0

Correct D. 8.5

Correct Answer: D

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Question 5

A metal M reacts with chlorine gas to form a white solid product. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of MCl2 is obtained from 1.5 g of M, what is the percentage yield of the reaction?

A. 80%

B. 85%

Correct C. 90%

D. 95%

Correct Answer: C

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Question 6

A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the initial pH of the acid is 3.5, what is the pH after the addition of 20 mL of NaOH?

A. 4.5

B. 5.5

Correct C. 6.5

D. 7.5

Correct Answer: C

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Question 7

A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.2 g, what is the percentage yield of the reaction?

A. 60%

B. 70%

Correct C. 80%

D. 90%

Correct Answer: C

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Question 8

A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?

A. 0.2 M

Correct B. 0.3 M

C. 0.4 M

D. 0.5 M

Correct Answer: B

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Question 9

A 2.0 L flask contains 0.1 M HCl. If 1.0 L of 0.1 M NaOH is added to the flask, what is the concentration of the resulting solution?

A. 0.05 M

B. 0.075 M

C. 0.1 M

Correct D. 0.125 M

Correct Answer: D

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Question 10

A 1.0 M solution of a weak base B is titrated with 1.0 M HCl. If the initial pH of the base is 10.5, what is the pH after the addition of 20 mL of HCl?

A. 5.5

B. 6.5

Correct C. 7.5

D. 8.5

Correct Answer: C

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Question 11

A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.2 g, what is the percentage yield of the reaction?

A. 60%

B. 70%

Correct C. 80%

D. 90%

Correct Answer: C

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Question 12

A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?

A. 0.2 M

Correct B. 0.3 M

C. 0.4 M

D. 0.5 M

Correct Answer: B

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Question 13

A 2.0 L flask contains 0.1 M HCl. If 1.0 L of 0.1 M NaOH is added to the flask, what is the concentration of the resulting solution?

A. 0.05 M

B. 0.075 M

C. 0.1 M

Correct D. 0.125 M

Correct Answer: D

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Question 14

The rate cons\tant (k) of a first-order reaction is given by the equation: ln\( [A]t/[A]0 \) = -kt. If the half-life of the reaction is 10 minutes, what is the value of k?

A. 0.0693 min^-1

B. 0.0693 s^-1

Correct C. 0.693 min^-1

D. 0.693 s^-1

Correct Answer: C

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Question 15

A 2.50 L flask contains 0.250 mol of CO2 at 298 K. What is the partial pressure of CO2 in the flask?

A. 0.500 atm

B. 0.750 atm

Correct C. 1.00 atm

D. 1.50 atm

Correct Answer: C

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Question 16

A 1.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. What is the pH of the resulting solution?

A. 0.00

Correct B. 1.00

C. 2.00

D. 3.00

Correct Answer: B

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Question 17

A 250 mL sample of a 0.100 M solution of FeCl3 is titrated with a 1.00 M solution of NaOH. What is the number of moles of NaOH required to reach the equivalence point?

A. 0.0250 mol

Correct B. 0.0500 mol

C. 0.0750 mol

D. 0.100 mol

Correct Answer: B

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Question 18

A 1.00 L flask contains 0.500 mol of O2 at 298 K. What is the partial pressure of O2 in the flask?

A. 0.500 atm

B. 0.750 atm

Correct C. 1.00 atm

D. 1.50 atm

Correct Answer: C

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Question 19

A 2.50 L flask contains 0.250 mol of CO at 298 K. What is the partial pressure of CO in the flask?

A. 0.500 atm

B. 0.750 atm

Correct C. 1.00 atm

D. 1.50 atm

Correct Answer: C

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Question 20

A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the pH of the resulting solution?

A. 0.00

Correct B. 1.00

C. 2.00

D. 3.00

Correct Answer: B

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Question 21

A 250 mL sample of a 0.100 M solution of FeCl3 is titrated with a 1.00 M solution of NaOH. What is the number of moles of NaOH required to reach the equivalence point?

A. 0.0250 mol

Correct B. 0.0500 mol

C. 0.0750 mol

D. 0.100 mol

Correct Answer: B

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Question 22

A 1.00 L flask contains 0.500 mol of O2 at 298 K. What is the partial pressure of O2 in the flask?

A. 0.500 atm

B. 0.750 atm

Correct C. 1.00 atm

D. 1.50 atm

Correct Answer: C

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Question 23

The atomic radius of an element in the periodic table increases down a group due to the addition of new energy levels. However, the atomic radius of an element in the periodic table decreases across a period due to the increase in effective nuclear charge. Which of the following elements has the largest atomic radius?

A. Rb

B. Cs

C. Fr

Correct D. Ba

Correct Answer: D

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Question 24

A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. If the gas is heated to 127°C at cons\tant volume, what is the new pressure?

A. 3.5 atm

Correct B. 4.5 atm

C. 5.5 atm

D. 6.5 atm

Correct Answer: B

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Question 25

A solution contains 10 g of glu\cose (C6H12O6) dissolved in 100 g of water. What is the mole \fraction of glu\cose in the solution?

A. 0.05

Correct B. 0.10

C. 0.15

D. 0.20

Correct Answer: B

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