Q. Which of the following statements is correct regarding the molecular orbital theory?
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A.
It explains the magnetic properties of molecules.
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B.
It does not apply to diatomic molecules.
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C.
It only considers sigma bonds.
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D.
It is not applicable to resonance structures.
Solution
Molecular orbital theory explains the magnetic properties of molecules, including paramagnetism and diamagnetism.
Correct Answer: A — It explains the magnetic properties of molecules.
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Q. Which of the following statements is false regarding inductive effect?
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A.
It is a permanent effect
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B.
It decreases with distance
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C.
It is stronger than mesomeric effect
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D.
It can be +I or -I
Solution
The inductive effect is generally weaker than the mesomeric effect.
Correct Answer: C — It is stronger than mesomeric effect
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Q. Which of the following statements is false regarding the inductive effect?
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A.
It is a permanent effect.
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B.
It operates through sigma bonds.
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C.
It can be observed in both aliphatic and aromatic compounds.
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D.
It involves the delocalization of pi electrons.
Solution
The inductive effect does not involve the delocalization of pi electrons; that is characteristic of the mesomeric effect.
Correct Answer: D — It involves the delocalization of pi electrons.
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Q. Which of the following statements is incorrect regarding molecular orbitals?
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A.
Molecular orbitals can be occupied by a maximum of two electrons.
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B.
Bonding molecular orbitals are lower in energy than the corresponding atomic orbitals.
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C.
Antibonding molecular orbitals are higher in energy than the corresponding atomic orbitals.
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D.
All molecular orbitals are degenerate.
Solution
Not all molecular orbitals are degenerate; some can have different energy levels.
Correct Answer: D — All molecular orbitals are degenerate.
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Q. Which of the following statements is logically consistent with the definition of multiples?
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A.
Every multiple of 7 is also a multiple of 14.
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B.
A number cannot be a multiple of itself.
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C.
The sum of two multiples of 3 is always a multiple of 3.
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D.
A multiple of 5 is never a multiple of 10.
Solution
The sum of two multiples of 3 is always a multiple of 3, as multiples of a number are closed under addition.
Correct Answer: C — The sum of two multiples of 3 is always a multiple of 3.
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Q. Which of the following statements is logically consistent with the definition of a multiple?
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A.
A multiple of a number is always greater than the number itself.
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B.
A multiple of a number can be negative.
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C.
A multiple of a number is always an integer.
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D.
All of the above.
Solution
All statements are true; multiples can be negative, can be equal to the number, and are always integers.
Correct Answer: D — All of the above.
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Q. Which of the following statements is logically valid based on the premises: All roses are flowers. Some flowers fade quickly.
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A.
Some roses fade quickly.
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B.
All flowers are roses.
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C.
No roses fade quickly.
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D.
Some flowers do not fade quickly.
Solution
The premises do not provide information about all flowers, so it is valid to conclude that some flowers do not fade quickly.
Correct Answer: D — Some flowers do not fade quickly.
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Q. Which of the following statements is most aligned with the author's argument regarding selections?
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A.
Selections should always be based on popular opinion.
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B.
Effective selections require a balance of intuition and analysis.
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C.
Selections are best made without consulting others.
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D.
The more options available, the better the selection.
Solution
The author argues that effective selections require a balance of intuition and analysis, suggesting a thoughtful approach to decision-making.
Correct Answer: B — Effective selections require a balance of intuition and analysis.
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Q. Which of the following statements is most likely to be true based on the passage?
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A.
The author believes that change is unnecessary.
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B.
The author advocates for gradual adaptation to new ideas.
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C.
The author dismisses traditional values entirely.
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D.
The author supports a return to past practices.
Solution
The passage suggests that while change is important, it should be approached gradually, aligning with option B.
Correct Answer: B — The author advocates for gradual adaptation to new ideas.
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Q. Which of the following statements is most likely to be true based on the passage's discussion of economic inequality? (2023)
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A.
Economic inequality has decreased in recent years.
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B.
Economic inequality is a complex issue with multiple causes.
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C.
Economic inequality only affects developing countries.
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D.
Economic inequality is solely a result of government policies.
Solution
The passage outlines various factors contributing to economic inequality, suggesting its complexity.
Correct Answer: B — Economic inequality is a complex issue with multiple causes.
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Q. Which of the following statements is most likely true based on the passage?
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A.
The author believes that change is unnecessary.
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B.
The author advocates for gradual change.
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C.
The author is against all forms of change.
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D.
The author supports immediate and radical change.
Solution
The passage suggests that the author advocates for gradual change, emphasizing the importance of careful consideration.
Correct Answer: B — The author advocates for gradual change.
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Q. Which of the following statements is not a cause of economic recession?
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A.
High unemployment rates.
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B.
Increased consumer spending.
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C.
Decline in manufacturing output.
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D.
Decreased investment.
Solution
Increased consumer spending typically stimulates the economy, making it the odd one out as a cause of recession.
Correct Answer: B — Increased consumer spending.
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Q. Which of the following statements is NOT a consequence of the first law of thermodynamics?
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A.
Energy can be converted from one form to another
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B.
The total energy of an isolated system is constant
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C.
Heat can spontaneously flow from cold to hot
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D.
Work done on a system increases its internal energy
Solution
The first law states that energy is conserved, and heat cannot spontaneously flow from cold to hot without work being done.
Correct Answer: C — Heat can spontaneously flow from cold to hot
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Q. Which of the following statements is NOT supported by the passage?
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A.
Cultural diversity enhances creativity and innovation.
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B.
Homogeneity in culture leads to societal stagnation.
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C.
All cultures are equally valuable and should be preserved.
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D.
Diversity can lead to misunderstandings and conflict.
Solution
The passage does not claim that all cultures are equally valuable, making option 2 unsupported.
Correct Answer: C — All cultures are equally valuable and should be preserved.
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Q. Which of the following statements is supported by the mixed graph regarding seasonal sales?
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A.
Sales peak during the summer months.
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B.
Winter months consistently show the lowest sales.
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C.
Sales are highest during the spring season.
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D.
There is no seasonal pattern in the sales data.
Solution
The mixed graph does not indicate any clear seasonal pattern, as sales fluctuate throughout the year.
Correct Answer: D — There is no seasonal pattern in the sales data.
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Q. Which of the following statements is supported by the passage? (2023)
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A.
All students prefer online learning over traditional classrooms.
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B.
Technology can facilitate personalized learning experiences.
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C.
Teachers are resistant to using technology in their classrooms.
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D.
Online resources are less effective than textbooks.
Solution
The passage supports the idea that technology can facilitate personalized learning experiences, allowing students to learn at their own pace.
Correct Answer: B — Technology can facilitate personalized learning experiences.
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Q. Which of the following statements is true about a buffer solution?
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A.
Resists changes in pH
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B.
Always has a pH of 7
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C.
Contains only strong acids
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D.
Is always neutral
Solution
A buffer solution resists changes in pH upon the addition of small amounts of acid or base.
Correct Answer: A — Resists changes in pH
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Q. Which of the following statements is true about a diverging lens?
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A.
It always produces real images
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B.
It has a positive focal length
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C.
It causes parallel rays to diverge
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D.
It can focus light to a point
Solution
A diverging lens causes parallel rays to diverge, making it impossible to focus light to a point.
Correct Answer: C — It causes parallel rays to diverge
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Q. Which of the following statements is true about a galvanic cell? (2020)
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A.
It converts chemical energy to electrical energy
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B.
It requires an external power source
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C.
It is always non-spontaneous
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D.
It operates at constant temperature only
Solution
A galvanic cell converts chemical energy into electrical energy spontaneously.
Correct Answer: A — It converts chemical energy to electrical energy
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Q. Which of the following statements is true about a perfectly inelastic collision?
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A.
Kinetic energy is conserved
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B.
Momentum is conserved
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C.
Both momentum and kinetic energy are conserved
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D.
None of the above
Solution
In a perfectly inelastic collision, momentum is conserved, but kinetic energy is not.
Correct Answer: B — Momentum is conserved
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Q. Which of the following statements is true about a system at equilibrium?
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A.
The concentrations of reactants and products are equal
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B.
The rate of the forward reaction equals the rate of the reverse reaction
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C.
No reactions occur
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D.
The system is at rest
Solution
At equilibrium, the rates of the forward and reverse reactions are equal, not necessarily the concentrations.
Correct Answer: B — The rate of the forward reaction equals the rate of the reverse reaction
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Q. Which of the following statements is true about a Wheatstone bridge?
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A.
It can only be used for DC circuits
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B.
It can measure both AC and DC resistances
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C.
It is only used for high resistances
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D.
It requires a power source to function
Solution
A Wheatstone bridge can be used to measure both AC and DC resistances.
Correct Answer: B — It can measure both AC and DC resistances
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Q. Which of the following statements is true about adsorption isotherms? (2023)
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A.
They describe the relationship between pressure and volume.
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B.
They describe the relationship between temperature and solubility.
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C.
They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
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D.
They describe the relationship between concentration and reaction rate.
Solution
Adsorption isotherms illustrate how the amount of adsorbate on a solid surface varies with pressure at a constant temperature.
Correct Answer: C — They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
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Q. Which of the following statements is true about adsorption? (2023)
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A.
It is a bulk phenomenon
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B.
It is a surface phenomenon
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C.
It occurs only in gases
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D.
It is always exothermic
Solution
Adsorption is a surface phenomenon as it occurs at the interface between phases.
Correct Answer: B — It is a surface phenomenon
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Q. Which of the following statements is true about aldehydes?
-
A.
They cannot form hydrogen bonds
-
B.
They are generally more reactive than ketones
-
C.
They have higher boiling points than ketones
-
D.
They are less soluble in water than ketones
Solution
Aldehydes are generally more reactive than ketones due to the presence of the hydrogen atom attached to the carbonyl carbon.
Correct Answer: B — They are generally more reactive than ketones
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Q. Which of the following statements is true about alkali metals? (2023)
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A.
They are good conductors of electricity
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B.
They have high ionization energies
-
C.
They are found in nature in free state
-
D.
They form acidic oxides
Solution
Alkali metals are good conductors of electricity due to the presence of free-moving electrons.
Correct Answer: A — They are good conductors of electricity
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Q. Which of the following statements is true about alkenes? (2019)
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A.
They contain at least one double bond
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B.
They are saturated hydrocarbons
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C.
They have a general formula of C_nH_(2n+2)
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D.
They cannot undergo addition reactions
Solution
Alkenes are characterized by the presence of at least one double bond between carbon atoms.
Correct Answer: A — They contain at least one double bond
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Q. Which of the following statements is true about alkynes?
-
A.
They are less reactive than alkenes.
-
B.
They are more acidic than alkenes.
-
C.
They cannot undergo addition reactions.
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D.
They have a higher boiling point than alkenes.
Solution
Alkynes are more acidic than alkenes due to the sp hybridization of the carbon atoms.
Correct Answer: B — They are more acidic than alkenes.
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Q. Which of the following statements is true about an exothermic reaction?
-
A.
It absorbs heat
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B.
It releases heat
-
C.
It has a positive enthalpy change
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D.
It is always spontaneous
Solution
An exothermic reaction releases heat, resulting in a negative enthalpy change.
Correct Answer: B — It releases heat
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Q. Which of the following statements is true about an ideal gas?
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A.
It has no intermolecular forces
-
B.
It behaves according to the ideal gas law at all temperatures
-
C.
It can be liquefied at any temperature
-
D.
Its specific heat is constant
Solution
An ideal gas is defined as a gas that has no intermolecular forces and follows the ideal gas law under all conditions.
Correct Answer: A — It has no intermolecular forces
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