POST UTME KSU 2019 Chemistry | Objective

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Question 1 View Details
Determine the empirical formula of a compound containing 40.0 g of carbon, 6.0 g of hydrogen, and 54.0 g of oxygen.
Correct A. CH2O
B. C2H4O2
C. C3H6O3
D. C4H8O4

Correct Answer: A

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Question 2 View Details
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 298 K. What is the number of moles of nitrogen gas present?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 3 View Details
A solution contains 2.5 g of glu\cose (C6H12O6) dissolved in 100 mL of water. What is the concentration of the solution in g/L?
A. 25
Correct B. 50
C. 75
D. 100

Correct Answer: B

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Question 4 View Details
A 2.0 L sample of a gas at 2.5 atm and 298 K is compressed to 1.0 L at cons\tant temperature. What is the new pressure of the gas?
A. 5
Correct B. 6.25
C. 7.5
D. 8.75

Correct Answer: B

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Question 5 View Details
A 10.0 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the solution after the titration?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 6 View Details
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 7 View Details
A 25 mL sample of a 0.5 M solution of NaOH is added to 50 mL of a 0.2 M solution of HCl. What is the resulting pH?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 8 View Details
A 100 mL sample of a 0.1 M solution of H2SO4 is titrated with a 0.2 M solution of NaOH. What is the pH of the resulting solution after 50 mL of NaOH has been added?
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 9 View Details
A 50 mL sample of a 0.2 M solution of HCl is added to 100 mL of a 0.1 M solution of NaOH. What is the resulting pH?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 10 View Details
A 25 mL sample of a 0.5 M solution of NaOH is added to 50 mL of a 0.2 M solution of HCl. What is the resulting pH?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 11 View Details
Determine the number of moles of $\text{O}_2$ required to react with 2.50 moles of $\text{C}_2\text{H}_4$ according to the equation $\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$.
A. 1.25 moles
B. 2.50 moles
Correct C. 3.75 moles
D. 5.00 moles

Correct Answer: C

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Question 12 View Details
A sample of $\text{H}_2\text{SO}_4$ has a mass of 250.0 g. If the molar mass of $\text{H}_2\text{SO}_4$ is 98.08 g/mol, calculate the number of moles of $\text{H}_2\text{SO}_4$ present in the sample.
A. 2.55 mol
Correct B. 2.56 mol
C. 2.57 mol
D. 2.58 mol

Correct Answer: B

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Question 13 View Details
A solution contains 0.500 M $\text{CaCl}_2$ and 0.500 M $\text{NaOH}$. Calculate the concentration of $\text{Ca(OH)}_2$ formed after the reaction is complete.
Correct A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M

Correct Answer: A

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Question 14 View Details
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, calculate the partial pressure of the gas.
A. 0.970 atm
B. 0.980 atm
C. 0.990 atm
Correct D. 1.00 atm

Correct Answer: D

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Question 15 View Details
A 250.0 g sample of a mixture of $\text{KNO}_3$ and $\text{NaCl}$ is dissolved in 250.0 mL of water. If the resulting solution has a conductivity of 1.50 mS/cm, calculate the molar conductivity of the solution.
A. 0.0100 S m^2/mol
B. 0.0150 S m^2/mol
Correct C. 0.0200 S m^2/mol
D. 0.0250 S m^2/mol

Correct Answer: C

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Question 16 View Details
The atomic number of an element is 26. What is the number of protons in the nucleus of an atom of this element?
A. 25
Correct B. 26
C. 27
D. 28

Correct Answer: B

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Question 17 View Details
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
Correct B. 7
C. 10
D. 12

Correct Answer: B

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Question 18 View Details
A gas at 300 K has a volume of 2 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 1.6
B. 2.4
Correct C. 3.2
D. 4.8

Correct Answer: C

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Question 19 View Details
A solution of 0.1 M FeCl3 is electrolyzed u\sing a platinum electrode. What is the mass of iron deposited at the cathode after 2 hours?
A. 0.06
B. 0.09
Correct C. 0.12
D. 0.15

Correct Answer: C

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Question 20 View Details
A mixture of 2 g of NaCl and 1 g of KCl is dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.1
B. 0.15
Correct C. 0.2
D. 0.25

Correct Answer: C

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