Q. Which of the following statements is true about aromatic compounds? (2022)
A.
They are always saturated
B.
They contain a benzene ring
C.
They are non-polar
D.
They do not undergo electrophilic substitution
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Solution
Aromatic compounds are characterized by the presence of a benzene ring, which is a stable cyclic structure.
Correct Answer: B — They contain a benzene ring
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Q. Which of the following statements is true about beryllium?
A.
It is more reactive than magnesium
B.
It forms covalent compounds
C.
It has a higher density than lithium
D.
It is a liquid at room temperature
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Solution
Beryllium forms covalent compounds due to its small size and high ionization energy.
Correct Answer: B — It forms covalent compounds
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Q. Which of the following statements is true about carboxylic acids?
A.
They are always soluble in water
B.
They have higher boiling points than alcohols
C.
They cannot form hydrogen bonds
D.
They are weak bases
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Solution
Carboxylic acids have higher boiling points than alcohols due to the ability to form dimers through hydrogen bonding.
Correct Answer: B — They have higher boiling points than alcohols
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Q. Which of the following statements is true about catalysts?
A.
They are consumed in the reaction
B.
They increase the activation energy
C.
They provide an alternative pathway with lower activation energy
D.
They change the equilibrium constant
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Solution
Catalysts provide an alternative pathway with lower activation energy, thus increasing the rate of the reaction without being consumed.
Correct Answer: C — They provide an alternative pathway with lower activation energy
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Q. Which of the following statements is true about continuous functions?
A.
They can be differentiated everywhere
B.
They are always bounded
C.
They can be integrated
D.
They can have jump discontinuities
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Solution
Continuous functions can be integrated over an interval, but they are not necessarily differentiable or bounded.
Correct Answer: C — They can be integrated
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Q. Which of the following statements is true about coordination compounds?
A.
They always have a positive charge
B.
They can exhibit color
C.
They cannot form complexes
D.
They are always soluble in water
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Solution
Coordination compounds can exhibit color due to d-d transitions and are not limited to having a positive charge.
Correct Answer: B — They can exhibit color
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Q. Which of the following statements is true about coordination compounds? (2021) 2021
A.
They are always ionic
B.
They can exhibit optical isomerism
C.
They have fixed oxidation states
D.
They cannot form complexes
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Solution
Coordination compounds can exhibit optical isomerism due to the arrangement of ligands around the central metal ion.
Correct Answer: B — They can exhibit optical isomerism
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Q. Which of the following statements is true about dynamic equilibrium?
A.
The concentrations of reactants and products are equal
B.
The rate of the forward reaction equals the rate of the reverse reaction
C.
The reaction has stopped
D.
All reactions reach dynamic equilibrium
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Solution
Dynamic equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction, not necessarily when concentrations are equal.
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 electric current? (2019)
A.
It is the flow of protons.
B.
It is the flow of electrons.
C.
It is the flow of neutrons.
D.
It is the flow of ions.
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Solution
Electric current is defined as the flow of electrons in a conductor.
Correct Answer: B — It is the flow of electrons.
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Q. Which of the following statements is true about electric field lines?
A.
They can cross each other
B.
They are always straight
C.
They point from positive to negative
D.
They are always circular
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Solution
Electric field lines point from positive to negative charges and never cross each other.
Correct Answer: C — They point from positive to negative
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Q. Which of the following statements is true about electrolysis?
A.
It requires a spontaneous reaction
B.
It is an endothermic process
C.
It involves the decomposition of a compound
D.
It occurs in a galvanic cell
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Solution
Electrolysis involves the decomposition of a compound using electrical energy.
Correct Answer: C — It involves the decomposition of a compound
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Q. Which of the following statements is true about electrolytic cells?
A.
They produce electrical energy
B.
They require an external power source
C.
They operate spontaneously
D.
They are always exothermic
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Solution
Electrolytic cells require an external power source to drive the non-spontaneous reactions.
Correct Answer: B — They require an external power source
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Q. Which of the following statements is true about entropy?
A.
Entropy is a measure of disorder
B.
Entropy decreases in irreversible processes
C.
Entropy is constant in reversible processes
D.
Both a and c are true
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Solution
Entropy is a measure of disorder, and it is constant in reversible processes, making both statements a and c true.
Correct Answer: D — Both a and c are true
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Q. Which of the following statements is true about equipotential surfaces?
A.
They are always parallel to each other
B.
No work is done moving a charge along them
C.
They can intersect
D.
They are always spherical
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Solution
No work is done when moving a charge along an equipotential surface because the potential is constant.
Correct Answer: B — No work is done moving a charge along them
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Q. Which of the following statements is true about ethers?
A.
They are polar compounds
B.
They have high boiling points
C.
They are highly reactive
D.
They are used as solvents
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Solution
Ethers are commonly used as solvents due to their relatively low reactivity and ability to dissolve a wide range of substances.
Correct Answer: D — They are used as solvents
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Q. Which of the following statements is true about exothermic reactions? (2019)
A.
They absorb heat.
B.
They release heat.
C.
They require energy input.
D.
They have a positive enthalpy change.
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Solution
Exothermic reactions release heat to the surroundings, resulting in a negative enthalpy change.
Correct Answer: B — They release heat.
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Q. Which of the following statements is true about galvanic cells? (2020)
A.
They convert chemical energy to electrical energy
B.
They require an external power source
C.
They operate only in acidic solutions
D.
They are always non-spontaneous
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Solution
Galvanic cells convert chemical energy into electrical energy spontaneously.
Correct Answer: A — They convert chemical energy to electrical energy
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Q. Which of the following statements is true about gases?
A.
They have a definite volume.
B.
They are incompressible.
C.
They fill the shape of their container.
D.
They have strong intermolecular forces.
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Solution
Gases fill the shape of their container because their particles are far apart and move freely.
Correct Answer: C — They fill the shape of their container.
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Q. Which of the following statements is true about geostationary satellites?
A.
They orbit the Earth in a polar orbit.
B.
They have a period equal to the Earth's rotation period.
C.
They are always in the same position relative to the Earth.
D.
Both b and c
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Solution
Geostationary satellites have a period equal to the Earth's rotation period and remain in the same position relative to the Earth.
Correct Answer: D — Both b and c
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Q. Which of the following statements is true about Gibbs Free Energy?
A.
ΔG is always positive for spontaneous processes.
B.
ΔG = ΔH - TΔS.
C.
ΔG can never be zero.
D.
ΔG is independent of temperature.
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Solution
The correct equation for Gibbs Free Energy is ΔG = ΔH - TΔS, which relates enthalpy, entropy, and temperature.
Correct Answer: B — ΔG = ΔH - TΔS.
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Q. Which of the following statements is true about gravitational field lines?
A.
They are straight lines
B.
They can cross each other
C.
They point towards the mass
D.
They are always circular
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Solution
Gravitational field lines point towards the mass creating the field.
Correct Answer: C — They point towards the mass
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Q. Which of the following statements is true about gravitational potential energy?
A.
It is always positive.
B.
It can be negative.
C.
It is independent of position.
D.
It is always zero.
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Solution
Gravitational potential energy can be negative depending on the reference point chosen.
Correct Answer: B — It can be negative.
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Q. Which of the following statements is true about ionic compounds?
A.
They have low melting points
B.
They conduct electricity in solid state
C.
They are soluble in water
D.
They are volatile
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Solution
Ionic compounds are generally soluble in water due to the polar nature of water molecules.
Correct Answer: C — They are soluble in water
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Q. Which of the following statements is true about isotopes?
A.
They have the same number of protons
B.
They have different chemical properties
C.
They have different atomic numbers
D.
They have the same mass number
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Solution
Isotopes have the same number of protons but different numbers of neutrons.
Correct Answer: A — They have the same number of protons
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Q. Which of the following statements is true about ketones?
A.
They can be oxidized to carboxylic acids
B.
They have a higher boiling point than aldehydes
C.
They cannot form hydrogen bonds
D.
They are more reactive than aldehydes
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Solution
Ketones cannot form hydrogen bonds with themselves due to the absence of a hydrogen atom attached to the carbonyl carbon.
Correct Answer: C — They cannot form hydrogen bonds
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Q. Which of the following statements is true about liquids?
A.
They have a definite shape.
B.
They are incompressible.
C.
They have a fixed volume.
D.
Both B and C.
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Solution
Liquids have a fixed volume and are incompressible, but they do not have a definite shape.
Correct Answer: D — Both B and C.
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Q. Which of the following statements is true about magnetic field lines?
A.
They can cross each other
B.
They are closed loops
C.
They start from south and end at north
D.
They are always straight lines
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Solution
Magnetic field lines are closed loops; they do not start or end but continue infinitely.
Correct Answer: B — They are closed loops
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Q. Which of the following statements is true about phenols? (2023)
A.
They are stronger acids than alcohols
B.
They do not react with bases
C.
They are less soluble in water than alcohols
D.
They are non-toxic
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Solution
Phenols are stronger acids than alcohols due to the resonance stabilization of the phenoxide ion.
Correct Answer: A — They are stronger acids than alcohols
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Q. Which of the following statements is true about real gases compared to ideal gases?
A.
Real gases obey gas laws perfectly
B.
Real gases have no intermolecular forces
C.
Real gases occupy no volume
D.
Real gases deviate from ideal behavior at high pressure
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Solution
Real gases deviate from ideal behavior at high pressures and low temperatures due to intermolecular forces and finite volume.
Correct Answer: D — Real gases deviate from ideal behavior at high pressure
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Q. Which of the following statements is true about real gases?
A.
They obey the ideal gas law at all conditions
B.
They have no volume
C.
They experience intermolecular forces
D.
They cannot be liquefied
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Solution
Real gases experience intermolecular forces, which is why they deviate from ideal behavior under certain conditions.
Correct Answer: C — They experience intermolecular forces
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