POST UTME MOUNTAIN TOP UNIVERSITY 2021 Chemistry | Objective

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Question 1 View Details
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the resulting solution after 25.0 mL of NaOH has been added.
A. 2.00
Correct B. 3.00
C. 4.00
D. 5.00

Correct Answer: B

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Question 2 View Details
A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: \[ \text{X} + \text{Cl}_2 \rightarrow \text{XCl}_3 \]. If 2.50 g of X reacts with 1.50 g of Cl2, what is the empirical formula of XCl3?
A. XCl
B. XCl2
Correct C. XCl3
D. XCl4

Correct Answer: C

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Question 3 View Details
A 2.00 L flask contains 0.100 mol of a non-ideal gas at 298 K. The gas is heated to 373 K and the volume is increased to 3.00 L. What is the new pressure of the gas?
A. 1.00 atm
Correct B. 2.00 atm
C. 3.00 atm
D. 4.00 atm

Correct Answer: B

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Question 4 View Details
A 0.100 M solution of HCl is titrated with 0.100 M NaOH. What is the pH of the resulting solution after 50.0 mL of NaOH has been added?
A. 2.00
B. 3.00
Correct C. 4.00
D. 5.00

Correct Answer: C

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Question 5 View Details
A metal (X) reacts with oxygen gas to form a white solid. The reaction is as follows: \[ \text{X} + \text{O}_2 \rightarrow \text{X}_2\text{O}_3 \]. If 2.50 g of X reacts with 1.50 g of O2, what is the empirical formula of X2O3?
A. X2O
B. X2O2
Correct C. X2O3
D. X2O4

Correct Answer: C

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Question 6 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) from the following reaction: CO2(g) → CO(g) + 1/2O2(g).
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
Correct D. -110.5 kJ/mol

Correct Answer: D

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Question 7 View Details
A 2.5 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
Correct C. 0.5 M
D. 1.0 M

Correct Answer: C

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Question 8 View Details
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 15 years?
Correct A. 12.5 g
B. 25 g
C. 50 g
D. 100 g

Correct Answer: A

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Question 9 View Details
A solution contains 10% ethanol by volume. If 100 mL of the solution is diluted to 200 mL, what is the concentration of ethanol in the new solution?
A. 5%
Correct B. 10%
C. 15%
D. 20%

Correct Answer: B

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Question 10 View Details
A 0.1 M solution of HCl is prepared by dissolving 0.1 g of HCl in 100 mL of water. Calculate the pH of the solution.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 11 View Details
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25.0 mL
Correct C. 37.5 mL
D. 50.0 mL

Correct Answer: C

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Question 12 View Details
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 1000. What is the molar mass of the repeating unit?
A. 50 g/mol
Correct B. 500 g/mol
C. 5000 g/mol
D. 50000 g/mol

Correct Answer: B

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Question 13 View Details
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

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Question 14 View Details
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution at the equivalence point?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

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Question 15 View Details
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the concentration of HCl after the addition of 25.0 mL of 0.100 M NaOH?
A. 0.050 M
B. 0.100 M
Correct C. 0.150 M
D. 0.200 M

Correct Answer: C

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Question 16 View Details
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the concentration of NaOH after the addition of 25.0 mL of 0.100 M HCl?
A. 0.050 M
Correct B. 0.100 M
C. 0.150 M
D. 0.200 M

Correct Answer: B

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Question 17 View Details
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of 0.100 M NaOH?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

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Question 18 View Details
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of 0.100 M HCl?
A. 0
B. 1
Correct C. 7
D. 14

Correct Answer: C

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Question 19 View Details
A solution contains 0.100 M HCl and 0.100 M NaOH. What is the concentration of HCl after the addition of 50.0 mL of 0.100 M NaOH?
A. 0.050 M
B. 0.100 M
C. 0.150 M
D. 0.200 M

Correct Answer: VIEW ANSWER

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Question 20 View Details
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a strong base NaOH. If the initial pH of the acid solution is 3.5, what is the pH of the resulting solution after the reaction is complete?
A. 4.5
Correct B. 5.5
C. 6.5
D. 7.5

Correct Answer: B

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Question 21 View Details
A sample of a gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.5 L
B. 1 L
Correct C. 2 L
D. 4 L

Correct Answer: C

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Question 22 View Details
A solution of NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.5 M
C. 1 M
D. 2 M

Correct Answer: B

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Question 23 View Details
A 2.0 M solution of HCl is titrated with a 2.0 M solution of NaOH. What is the pH of the resulting solution after 10 mL of NaOH has been added?
A. 2
B. 3
Correct C. 4
D. 5

Correct Answer: C

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Question 24 View Details
A sample of a gas at 100°C and 1 atm is heated to 200°C at cons\tant pressure. What is the new volume of the gas?
A. 2 L
B. 4 L
C. 6 L
Correct D. 8 L

Correct Answer: D

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Question 25 View Details
A 0.1 M solution of a weak base B is mixed with a 0.1 M solution of a strong acid HCl. If the initial pH of the base solution is 10.5, what is the pH of the resulting solution after the reaction is complete?
A. 5.5
B. 6.5
Correct C. 7.5
D. 8.5

Correct Answer: C

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