POST UTME MOUNTAIN TOP UNIVERSITY 2022 Chemistry | Objective

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Question 1 View Details
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with excess oxygen gas according to the equation: 2H2 + O2 → 2H2O.
Correct A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles

Correct Answer: A

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Question 2 View Details
A 25 mL sample of a solution containing 0.1 M NaCl is diluted to 100 mL. What is the new concentration of the solution?
Correct A. 0.01 M
B. 0.1 M
C. 0.5 M
D. 1 M

Correct Answer: A

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Question 3 View Details
A solution contains 5.0 g of glu\cose (C6H12O6) per 100 mL. What is the molarity of the solution?
A. 0.1 M
Correct B. 0.5 M
C. 1 M
D. 5 M

Correct Answer: B

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

Correct Answer: B

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Question 5 View Details
A 10 mL sample of a solution containing 0.5 M K2Cr2O7 is mixed with 10 mL of a solution containing 0.2 M FeSO4. What is the concentration of the resulting solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.3 M
D. 0.4 M

Correct Answer: C

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Question 6 View Details
In the electrolysis of a solution of CuSO4, the anode is made of platinum and the cathode is made of copper. What is the expected product at the cathode?
A. Cu2+ ions
Correct B. Cu metal
C. O2 gas
D. H2 gas

Correct Answer: B

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Question 7 View Details
What is the major product of the reaction between 2-methylpropane and HCl?
Correct A. 2-chloro-2-methylpropane
B. 2-methyl-2-chloropropane
C. 2-methyl-1-chloropropane
D. 2-methyl-2-chlorobu\tane

Correct Answer: A

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Question 8 View Details
A colloidal solution of starch in water is known as?
A. Starch paste
B. Starch solution
Correct C. Starch dispersion
D. Starch emulsion

Correct Answer: C

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Question 9 View Details
The process of removing pollu\tants from the atmosphere is known as?
A. Photosynthesis
B. Respiration
C. Decomposition
Correct D. Air purification

Correct Answer: D

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Question 10 View Details
A polymer that has a repeating unit of CH2=CH-CH3 is known as?
A. Polyethylene
Correct B. Polypropylene
C. Polyvinyl chloride
D. Polybutadiene

Correct Answer: B

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Question 11 View Details
Determine the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). Given that ΔH°(Al2O3(s)) = -1675 kJ/mol and ΔH°(Fe(s)) = 0 kJ/mol.
Correct A. -3350 kJ/mol
B. -1675 kJ/mol
C. 3350 kJ/mol
D. -5000 kJ/mol

Correct Answer: A

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Question 12 View Details
A 2.5 L sample of CO2 gas at 27°C and 1 atm is collected over water. Calculate the partial pressure of CO2 in the gas mixture.
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 13 View Details
The reaction 2NO(g) + O2(g) → 2NO2(g) has a s\tandard enthalpy change of -112 kJ/mol. What is the s\tandard enthalpy change for the reaction 2NO2(g) → 2NO(g) + O2(g)?
A. 112 kJ/mol
Correct B. -112 kJ/mol
C. -224 kJ/mol
D. 224 kJ/mol

Correct Answer: B

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Question 14 View Details
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 15 View Details
A 2.00 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 0.0313 atm, what is the partial pressure of the gas?
A. 0.968 atm
Correct B. 0.974 atm
C. 0.980 atm
D. 0.986 atm

Correct Answer: B

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Question 16 View Details
A 2.00 L sample of a gas at 27°C and 1.00 atm is compressed to 0.50 L at 37°C. Calculate the new pressure in atm.
Correct A. 2.50 atm
B. 1.50 atm
C. 3.00 atm
D. 4.00 atm

Correct Answer: A

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Question 17 View Details
A solution of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH after 25.0 mL of NaOH has been added.
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 18 View Details
The compound SO2 has a molar mass of 64.07 g/mol. Calculate the number of moles of SO2 in 25.0 g of the compound.
A. 0.390 mol
Correct B. 0.3905 mol
C. 0.391 mol
D. 0.392 mol

Correct Answer: B

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Question 19 View Details
A 50.0 mL sample of a 0.100 M solution of NaOH is titrated with a 0.100 M solution of HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 50.0 mL
B. 75.0 mL
Correct C. 100 mL
D. 125 mL

Correct Answer: C

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Question 20 View Details
A 2.00 L sample of a gas at 27°C and 1.00 atm is compressed to 0.50 L at 37°C. Calculate the new pressure in atm.
Correct A. 2.50 atm
B. 1.50 atm
C. 3.00 atm
D. 4.00 atm

Correct Answer: A

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Question 21 View Details
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 22 View Details
A 25 mL sample of 0.5 M H2SO4 is titrated with 1 M NaOH. What is the pH of the solution after 10 mL of NaOH has been added?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 23 View Details
The periodic table is arranged in a way that elements with similar properties are placed in the same group. What is the name of this arrangement?
A. Periodic Tr\end
Correct B. Periodic Table
C. Atomic Number
D. Electron Configuration

Correct Answer: B

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Question 24 View Details
A polymer is a long chain of repeating units called monomers. What is the name of the process by which monomers are linked together to form a polymer?
Correct A. Polymerization
B. Depolymerization
C. Condensation
D. Hydrolysis

Correct Answer: A

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Question 25 View Details
A redox reaction involves the transfer of electrons from one species to another. What is the name of the species that loses electrons?
A. Oxidizing Agent
Correct B. Reducing Agent
C. Electron Donor
D. Electron Acceptor

Correct Answer: B

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