POST UTME AL-HIKMAH UNIVERSITY 2022 Chemistry | Objective

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Question 1
A 2.5 L sample of a gas at 27°C and 1.2 atm is heated to 57°C at cons\tant volume. What is the new pressure in atm?
A. 1.8 atm
Correct B. 2.1 atm
C. 2.5 atm
D. 3.0 atm

Correct Answer: B

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Question 2
A 25.0 g sample of a polymer is dissolved in 100.0 mL of a solvent. If the density of the solution is 1.05 g/mL, what is the molar mass of the polymer?
A. 500 g/mol
B. 750 g/mol
Correct C. 1000 g/mol
D. 1500 g/mol

Correct Answer: C

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Question 3
A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the resulting pH?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 4
A 5.0 g sample of a subs\tance is burned in a bomb calorimeter, relea\sing 12.5 kJ of heat. What is the molar heat of combustion of the subs\tance?
A. -2500 kJ/mol
B. -3000 kJ/mol
Correct C. -3500 kJ/mol
D. -4000 kJ/mol

Correct Answer: C

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Question 5
A 1.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. What is the resulting pH?
A. 1.0
B. 2.0
C. 3.0
Correct D. 4.0

Correct Answer: D

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Question 6
A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant pressure. Calculate the ratio of the final volume to the initial volume.
Correct A. 1.25
B. 2.00
C. 3.00
D. 4.00

Correct Answer: A

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Question 7
The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: 2NaOH + Cl2 → NaClO + NaCl + H2O. If 2.5 g of NaOH is added to 100 mL of Cl2 solution, what is the limiting reac\tant?
Correct A. NaOH
B. Cl2
C. NaClO
D. NaCl

Correct Answer: A

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Question 8
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 25 mL of NaOH is added, what is the pH of the solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 9
A sample of a gas at 27°C and 1 atm is compressed to 2 atm at cons\tant temperature. Calculate the new volume of the gas.
A. 0.50
Correct B. 1.00
C. 1.50
D. 2.00

Correct Answer: B

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Question 10
A 1.0 M solution of H2SO4 is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 11
A 0.1 M solution of AgNO3 is mixed with 0.1 M solution of NaCl. What is the concentration of AgCl formed in the solution?
A. 0.1 M
Correct B. 0.05 M
C. 0.02 M
D. 0.01 M

Correct Answer: B

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Question 12
A sample of a hydrocarbon has a molecular formula of C5H12. What is the type of hydrocarbon?
Correct A. Alkane
B. Alkene
C. Alkyne
D. Aromatic

Correct Answer: A

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Question 13
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 14
A sample of a metal has a density of 10 g/cm3 and a volume of 2 cm3. What is the mass of the metal?
A. 20 g
Correct B. 30 g
C. 40 g
D. 50 g

Correct Answer: B

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Question 15
A diagram of a titration setup is shown below. What is the purpose of the burette?
Correct A. To measure the volume of the solution
B. To measure the concentration of the solution
C. To measure the pH of the solution
D. To measure the temperature of the solution

Correct Answer: A

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Question 16
The atomic radius of an element is 100 pm. If the element is in the 4th period of the periodic table, what is the value of the principal quantum number (n) for this element?
A. 3
Correct B. 4
C. 5
D. 6

Correct Answer: B

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Question 17
A 0.5 M solution of HCl is prepared by dissolving 25 g of HCl in water to make 1 L of solution. What is the molarity of the solution?
A. 0.25 M
Correct B. 0.5 M
C. 1.0 M
D. 2.0 M

Correct Answer: B

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Question 18
A sample of a metal (X) has a density of 8.5 g/cm^3 and a mass of 25 g. What is the volume of the sample?
A. 2.94 cm^3
B. 3.05 cm^3
Correct C. 3.17 cm^3
D. 3.29 cm^3

Correct Answer: C

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Question 19
A 2.0 L sample of a gas at 27°C and 1.0 atm is compressed to 0.5 L at 37°C. What is the final pressure of the gas?
A. 2.5 atm
Correct B. 3.0 atm
C. 3.5 atm
D. 4.0 atm

Correct Answer: B

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Question 20
A solution of NaOH is prepared by dissolving 10 g of NaOH in 100 mL of water. What is the molarity of the solution?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 21
The atomic number of an element is 15. If the mass number of the most abundant isotope is 31, what is the number of neutrons in the nucleus of this isotope?
A. 16
B. 15
Correct C. 14
D. 17

Correct Answer: C

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Question 22
A 2.5 g sample of a non-metallic oxide of nitrogen is decomposed by heating with graphite. The volume of nitrogen gas produced at STP is 2.5 L. What is the empirical formula of the oxide?
Correct A. N2O
B. NO
C. N2O3
D. N2O5

Correct Answer: A

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Question 23
A 3.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The volume of CO2 produced at STP is 2.0 L. What is the mass of the metal oxide produced?
Correct A. 3.6 g
B. 3.2 g
C. 3.0 g
D. 2.8 g

Correct Answer: A

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Question 24
A 2.0 g sample of a non-metallic ha\logen is heated to produce a diatomic gas. The volume of the gas produced at STP is 1.5 L. What is the empirical formula of the ha\logen?
Correct A. Cl2
B. Br2
C. I2
D. F2

Correct Answer: A

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Question 25
A 3.5 g sample of a metal sulfide is heated to produce a metal oxide and sulfur dioxide gas. The volume of SO2 produced at STP is 2.5 L. What is the mass of the metal oxide produced?
Correct A. 4.2 g
B. 3.8 g
C. 3.5 g
D. 3.2 g

Correct Answer: A

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