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 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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Q. Which of the following statements is true about redox reactions?
A.
They always involve the transfer of protons.
B.
They involve the transfer of electrons.
C.
They do not involve changes in oxidation states.
D.
They can only occur in acidic solutions.
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Solution
Redox reactions involve the transfer of electrons between species.
Correct Answer: B — They involve the transfer of electrons.
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Q. Which of the following statements is true about s-block elements?
A.
They have completely filled d-orbitals
B.
They have one or two electrons in their outermost shell
C.
They are all gases at room temperature
D.
They form acidic oxides
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Solution
S-block elements have one or two electrons in their outermost shell.
Correct Answer: B — They have one or two electrons in their outermost shell
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Q. Which of the following statements is true about the complex ion [Co(NH3)6]3+?
A.
It is paramagnetic
B.
It is diamagnetic
C.
It has a coordination number of 4
D.
It contains a transition metal
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Solution
Cobalt is a transition metal, and the complex has a coordination number of 6.
Correct Answer: D — It contains a transition metal
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Q. Which of the following statements is true about the complex [Cr(NH3)6]3+?
A.
It is tetrahedral
B.
It is octahedral
C.
It is square planar
D.
It is linear
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Solution
[Cr(NH3)6]3+ has an octahedral geometry due to the six ligands surrounding the chromium ion.
Correct Answer: B — It is octahedral
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Q. Which of the following statements is true about the complex [Fe(CN)6]3-?
A.
It is paramagnetic
B.
It is diamagnetic
C.
It has a coordination number of 4
D.
It contains only monodentate ligands
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Solution
[Fe(CN)6]3- is diamagnetic because all the electrons are paired in the d-orbitals of Fe in the +3 oxidation state.
Correct Answer: B — It is diamagnetic
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Q. Which of the following statements is true about the electron configuration of an atom?
A.
Electrons fill orbitals in order of increasing energy
B.
Electrons can occupy the same orbital with opposite spins
C.
Both A and B
D.
None of the above
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Solution
Both statements A and B are true regarding electron configurations.
Correct Answer: C — Both A and B
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Q. Which of the following statements is true about the equilibrium constant Kp?
A.
Kp is always equal to Kc
B.
Kp depends on temperature
C.
Kp is independent of pressure
D.
Kp is always greater than Kc
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Solution
Kp is dependent on temperature and can vary with changes in temperature.
Correct Answer: B — Kp depends on temperature
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Q. Which of the following statements is true about the molecular orbital theory?
A.
It only applies to diatomic molecules
B.
It explains the magnetic properties of molecules
C.
It does not consider electron spin
D.
It is less accurate than valence bond theory
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Solution
Molecular orbital theory explains the magnetic properties of molecules, particularly the presence of unpaired electrons.
Correct Answer: B — It explains the magnetic properties of molecules
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Q. Which of the following statements is true about the second law of thermodynamics?
A.
Energy can be created
B.
Entropy of an isolated system always decreases
C.
Entropy of an isolated system always increases
D.
Energy can be destroyed
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Solution
The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.
Correct Answer: C — Entropy of an isolated system always increases
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Q. Which of the following statements is true according to molecular orbital theory?
A.
Bonding orbitals are higher in energy than antibonding orbitals.
B.
Bonding orbitals are lower in energy than antibonding orbitals.
C.
All molecular orbitals are degenerate.
D.
Molecular orbitals do not influence bond length.
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Solution
Bonding orbitals are lower in energy than antibonding orbitals, which is a fundamental principle of molecular orbital theory.
Correct Answer: B — Bonding orbitals are lower in energy than antibonding orbitals.
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Q. Which of the following statements is true according to Raoult's Law?
A.
The vapor pressure of a solution is always higher than that of the pure solvent.
B.
The vapor pressure of a solution is lower than that of the pure solvent.
C.
Raoult's Law applies only to ideal solutions.
D.
The mole fraction of solute affects the vapor pressure of the solvent.
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Solution
Raoult's Law indicates that the vapor pressure of a solution is lower than that of the pure solvent due to the presence of solute.
Correct Answer: B — The vapor pressure of a solution is lower than that of the pure solvent.
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Q. Which of the following statements is true according to the first law of thermodynamics?
A.
Energy can be created or destroyed.
B.
Energy can only be transformed from one form to another.
C.
The total energy of an isolated system decreases.
D.
Heat and work are the same forms of energy.
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Solution
The first law of thermodynamics states that energy can only be transformed from one form to another, not created or destroyed.
Correct Answer: B — Energy can only be transformed from one form to another.
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Q. Which of the following statements is true according to the kinetic molecular theory?
A.
Gas particles have significant volume
B.
Gas particles are in constant motion
C.
Gas particles attract each other
D.
Gas particles do not collide
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Solution
According to the kinetic molecular theory, gas particles are in constant motion.
Correct Answer: B — Gas particles are in constant motion
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Q. Which of the following statements is true according to the second law of thermodynamics?
A.
Energy can be created
B.
Entropy of the universe decreases
C.
Heat cannot spontaneously flow from a colder body to a hotter body
D.
All processes are reversible
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Solution
The second law states that heat cannot spontaneously flow from a colder body to a hotter body, which implies that entropy of the universe tends to increase.
Correct Answer: C — Heat cannot spontaneously flow from a colder body to a hotter body
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Q. Which of the following statements is true for an adiabatic process?
A.
Heat is exchanged with the surroundings
B.
The system is insulated from heat transfer
C.
Temperature remains constant
D.
Pressure remains constant
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Solution
In an adiabatic process, the system is insulated from heat transfer, meaning no heat is exchanged with the surroundings.
Correct Answer: B — The system is insulated from heat transfer
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Q. Which of the following statements is true for an endothermic reaction?
A.
ΔH is negative
B.
ΔH is positive
C.
Activation energy is zero
D.
It occurs spontaneously
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Solution
In an endothermic reaction, the enthalpy change (ΔH) is positive as heat is absorbed.
Correct Answer: B — ΔH is positive
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Q. Which of the following statements is true for an exothermic reaction?
A.
ΔH is positive
B.
ΔH is negative
C.
ΔH = 0
D.
ΔH is undefined
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Solution
In an exothermic reaction, heat is released, so ΔH is negative.
Correct Answer: B — ΔH is negative
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Q. Which of the following statements is true for an isobaric process?
A.
Pressure remains constant
B.
Volume remains constant
C.
Temperature remains constant
D.
Internal energy remains constant
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Solution
In an isobaric process, the pressure remains constant.
Correct Answer: A — Pressure remains constant
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Q. Which of the following statements is true for real gases?
A.
They obey the ideal gas law at all conditions
B.
They have no volume
C.
They experience intermolecular forces
D.
They have a fixed shape
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Solution
Real gases experience intermolecular forces, which causes deviations from ideal behavior.
Correct Answer: C — They experience intermolecular forces
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Q. Which of the following statements is true regarding a catalyst?
A.
Increases activation energy
B.
Lowers activation energy
C.
Changes the equilibrium constant
D.
Is consumed in the reaction
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Solution
A catalyst lowers the activation energy of a reaction, thereby increasing the rate without being consumed.
Correct Answer: B — Lowers activation energy
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Q. Which of the following statements is true regarding a saturated solution?
A.
It contains more solute than solvent.
B.
It is in dynamic equilibrium.
C.
It can dissolve more solute.
D.
It is always at room temperature.
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Solution
A saturated solution is in dynamic equilibrium where the rate of dissolution equals the rate of crystallization.
Correct Answer: B — It is in dynamic equilibrium.
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Q. Which of the following statements is true regarding adsorption?
A.
Adsorption is always an exothermic process
B.
Adsorption increases with increasing temperature
C.
Adsorption is a bulk phenomenon
D.
Adsorption does not depend on surface area
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Solution
Adsorption is generally an exothermic process, as it releases energy.
Correct Answer: A — Adsorption is always an exothermic process
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Q. Which of the following statements is true regarding an endothermic reaction?
A.
Heat is released
B.
Heat is absorbed
C.
No heat change
D.
It occurs spontaneously
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Solution
In an endothermic reaction, heat is absorbed from the surroundings.
Correct Answer: B — Heat is absorbed
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Q. Which of the following statements is true regarding catalysts?
A.
They are consumed in the reaction
B.
They increase the activation energy
C.
They provide an alternative pathway
D.
They change the equilibrium constant
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Solution
Catalysts provide an alternative pathway with a lower activation energy, thus increasing the reaction rate without being consumed.
Correct Answer: C — They provide an alternative pathway
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Q. Which of the following statements is true regarding chemisorption?
A.
It is a reversible process.
B.
It involves the formation of a chemical bond.
C.
It occurs at low temperatures.
D.
It is independent of surface area.
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Solution
Chemisorption involves the formation of a chemical bond and is generally an irreversible process.
Correct Answer: B — It involves the formation of a chemical bond.
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Q. Which of the following statements is true regarding colligative properties?
A.
They depend on the identity of the solute
B.
They depend on the concentration of the solute
C.
They depend on the nature of the solvent
D.
They depend on the number of solute particles
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Solution
Colligative properties depend on the number of solute particles, not their identity.
Correct Answer: D — They depend on the number of solute particles
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Q. Which of the following statements is true regarding coordination compounds?
A.
They always have a fixed oxidation state.
B.
They can exhibit different colors.
C.
They cannot form isomers.
D.
They are always soluble in water.
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Solution
Coordination compounds can exhibit different colors due to the presence of different ligands and their ability to split d-orbitals.
Correct Answer: B — They can exhibit different colors.
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Q. Which of the following statements is true regarding 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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