POST UTME MADONNA UNIVERSITY 2021 Chemistry | Objective

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Question 1
A sample of an ideal gas at 25°C and 1 atm is heated to 100°C at cons\tant pressure. What is the new volume of the gas?
A. 2.00 L
B. 4.00 L
Correct C. 8.00 L
D. 16.00 L

Correct Answer: C

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Question 2
A solution of NaOH is titrated with HCl. The initial pH of the solution is 10. If 25 mL of 0.1 M HCl is added, what is the new pH?
A. 7.00
Correct B. 8.00
C. 9.00
D. 10.00

Correct Answer: B

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Question 3
A 2.00 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1.00 L of water. What is the pH of the solution?
Correct A. 0.00
B. 1.00
C. 2.00
D. 3.00

Correct Answer: A

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Question 4
A sample of an ideal 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. 0.50 L
B. 1.00 L
Correct C. 2.00 L
D. 4.00 L

Correct Answer: C

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Question 5
A solution of NaOH is titrated with HCl. The initial pH of the solution is 10. If 50 mL of 0.1 M HCl is added, what is the new pH?
A. 6.00
B. 7.00
Correct C. 8.00
D. 9.00

Correct Answer: C

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Question 6
Determine the s\tandard potential of the cell represented by the following reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s). The s\tandard reduction potentials for Zn2+/Zn and Cu2+/Cu are -0.76 V and +0.34 V, respectively. Assume that the temperature is 25°C.
A. -1.10 V
Correct B. +0.58 V
C. -0.42 V
D. +0.58 V

Correct Answer: B

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Question 7
A 0.50 M solution of HCl is mixed with a 0.50 M solution of NaOH. 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 8
The rate cons\tant for the first-order decomposition of N2O5 is 2.0 × 10^\( -3 \) min^\( -1 \) at 25°C. What is the half-life of N2O5?
Correct A. 10 min
B. 20 min
C. 30 min
D. 40 min

Correct Answer: A

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Question 9
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. 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 10
The reaction of H2O2 with NaOH is represented by the equation: H2O2 + 2NaOH → Na2O2 + 2H2O. What is the rate law for this reaction?
A. rate = k[NaOH]^2[H2O2]
Correct B. rate = k[NaOH][H2O2]
C. rate = k[H2O2]^2[NaOH]
D. rate = k[NaOH]^2[H2O2]^2

Correct Answer: B

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Question 11
In a redox reaction, what is the role of the catalyst in the electrolysis of water?
Correct A. To increase the rate of reaction
B. To decrease the rate of reaction
C. To increase the yield of hydrogen gas
D. To decrease the yield of oxygen gas

Correct Answer: A

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Question 12
What is the change in entropy when 1 mole of an ideal gas expands from 1 L to 2 L at cons\tant temperature?
A. -22.4 J/K
Correct B. 22.4 J/K
C. -11.2 J/K
D. 11.2 J/K

Correct Answer: B

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Question 13
What is the type of bond formed between a nitrogen atom and a hydrogen atom in NH3?
A. Ionic bond
B. Covalent bond
Correct C. Polar covalent bond
D. Hydrogen bond

Correct Answer: C

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Question 14
What is the molar solubility of AgCl in 1 L of water?
Correct A. 1.2 x 10^-5 M
B. 1.2 x 10^-6 M
C. 1.2 x 10^-7 M
D. 1.2 x 10^-8 M

Correct Answer: A

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Question 15
What is the type of colloid formed when a mixture of oil and water is shaken?
A. Floculated colloid
Correct B. Emulsified colloid
C. Coagulated colloid
D. Precipitated colloid

Correct Answer: B

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Question 16
At 273 K, 1.00 mol of an ideal gas occupies a volume of 22.4 L. What is the pressure of the gas?
Correct A. 1.00 atm
B. 2.00 atm
C. 3.00 atm
D. 4.00 atm

Correct Answer: A

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Question 17
A 2.50-g sample of a non-metallic element is heated in a crucible until it is completely vaporized. If the vapor density of the element is 4.00 g/L, what is the molar mass of the element?
A. 20.0 g/mol
B. 30.0 g/mol
Correct C. 40.0 g/mol
D. 50.0 g/mol

Correct Answer: C

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Question 18
A solution contains 0.100 M HCl and 0.100 M NaOH. 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 19
A 2.50-g sample of a metal is heated in a crucible until it is completely vaporized. If the vapor density of the metal is 10.0 g/L, what is the molar mass of the metal?
A. 50.0 g/mol
B. 60.0 g/mol
C. 70.0 g/mol
Correct D. 80.0 g/mol

Correct Answer: D

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Question 20
A solution contains 0.100 M H2SO4 and 0.100 M NaOH. What is the pH of the solution?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 21
The polymerization of styrene to polystyrene is an example of a chain reaction. What is the role of the initiator in this reaction?
A. To provide a source of heat
Correct B. To initiate the polymerization reaction
C. To act as a catalyst
D. To provide a source of oxygen

Correct Answer: B

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Question 22
A solution of glu\cose in water is a homogeneous mixture. What is the term for this type of mixture?
A. Saturated solution
Correct B. Homogeneous mixture
C. Heterogeneous mixture
D. Colloidal solution

Correct Answer: B

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Question 23
The atomic number of an element is equal to the number of protons in its atomic nucleus. What is the atomic number of the element with atomic symbol 'Ag'?
Correct A. 45
B. 47
C. 48
D. 49

Correct Answer: A

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Question 24
The solubility of a subs\tance is defined as the maximum amount of the subs\tance that can dissolve in a given amount of solvent at a particular temperature. What is the unit of solubility?
A. g/L
B. g/mol
Correct C. mol/L
D. g/cm^3

Correct Answer: C

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Question 25
The reaction between sodium hydroxide and hydrochloric acid is a neutralization reaction. What is the products of this reaction?
Correct A. NaCl and H2O
B. NaOH and HCl
C. Na2O and H2
D. NaClO and H2O

Correct Answer: A

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