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 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 regarding enthalpy?
A.
Enthalpy is a state function
B.
Enthalpy depends on the path taken
C.
Enthalpy cannot be measured
D.
Enthalpy is always positive
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Solution
Enthalpy is a state function, meaning it depends only on the initial and final states, not the path taken.
Correct Answer: A — Enthalpy is a state function
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Q. Which of the following statements is true regarding entropy?
A.
Entropy is a state function.
B.
Entropy can never decrease.
C.
Entropy is independent of temperature.
D.
Entropy is always positive.
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Solution
Entropy is a state function, meaning it depends only on the state of the system and not on how it reached that state.
Correct Answer: A — Entropy is a state function.
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Q. Which of the following statements is true regarding Gibbs Free Energy?
A.
ΔG is always positive for spontaneous processes.
B.
ΔG = ΔH - TΔS.
C.
ΔG can never be negative.
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 regarding ideal solutions?
A.
They obey Raoult's Law at all concentrations.
B.
They do not exhibit any deviation from Raoult's Law.
C.
They have a constant boiling point.
D.
They have a variable composition.
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Solution
Ideal solutions obey Raoult's Law without any deviation, meaning their properties are consistent with the law across all concentrations.
Correct Answer: B — They do not exhibit any deviation from Raoult's Law.
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Q. Which of the following statements is true regarding non-ideal solutions?
A.
They obey Raoult's Law perfectly.
B.
They show positive or negative deviations from Raoult's Law.
C.
Their vapor pressure is always higher than predicted by Raoult's Law.
D.
They cannot be formed by mixing two volatile liquids.
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Solution
Non-ideal solutions show positive or negative deviations from Raoult's Law due to interactions between different molecules.
Correct Answer: B — They show positive or negative deviations from Raoult's Law.
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Q. Which of the following statements is true regarding Raoult's Law?
A.
It applies to all types of solutions.
B.
It is only applicable to ideal solutions.
C.
It can be used for any solute-solvent combination.
D.
It is not applicable to volatile solutes.
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Solution
Raoult's Law is primarily applicable to ideal solutions, where the solute and solvent behave similarly.
Correct Answer: B — It is only applicable to ideal solutions.
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Q. Which of the following statements is true regarding redox reactions?
A.
Oxidation involves gain of electrons.
B.
Reduction involves loss of electrons.
C.
Oxidizing agents are reduced.
D.
Reducing agents are oxidized.
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Solution
Oxidizing agents are reduced in redox reactions.
Correct Answer: C — Oxidizing agents are reduced.
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Q. Which of the following statements is true regarding the activation energy (Ea) of a reaction?
A.
It is always positive
B.
It can be negative
C.
It is independent of temperature
D.
It is the energy of the products
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Solution
The activation energy (Ea) of a reaction is always positive.
Correct Answer: A — It is always positive
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Q. Which of the following statements is true regarding the activation energy?
A.
It is always positive
B.
It can be negative
C.
It is independent of temperature
D.
It is the energy of products
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Solution
Activation energy is always positive as it represents the minimum energy required for a reaction to occur.
Correct Answer: A — It is always positive
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Q. Which of the following statements is true regarding the boiling point of a liquid?
A.
It is constant regardless of pressure.
B.
It increases with increasing atmospheric pressure.
C.
It decreases with increasing atmospheric pressure.
D.
It is the same for all liquids.
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Solution
The boiling point of a liquid increases with increasing atmospheric pressure.
Correct Answer: B — It increases with increasing atmospheric pressure.
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Q. Which of the following statements is true regarding the energy levels of molecular orbitals?
A.
σ orbitals are always lower in energy than π orbitals.
B.
π orbitals are always lower in energy than σ orbitals.
C.
For second period elements, σ2p is lower than π2p.
D.
Bonding orbitals are higher in energy than antibonding orbitals.
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Solution
For second period elements, σ2p is lower in energy than π2p.
Correct Answer: C — For second period elements, σ2p is lower than π2p.
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Q. Which of the following statements is true regarding the equilibrium constant (K) for a reaction?
A.
K is temperature dependent
B.
K is pressure dependent
C.
K is concentration dependent
D.
K is always equal to 1
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Solution
The equilibrium constant (K) is dependent on temperature; it changes with temperature variations.
Correct Answer: A — K is temperature dependent
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Q. Which of the following statements is true regarding the equilibrium constant Kc?
A.
Kc is temperature dependent
B.
Kc is pressure dependent
C.
Kc is concentration dependent
D.
Kc is independent of the reaction
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Solution
The equilibrium constant Kc is dependent on temperature; changing the temperature will change the value of Kc.
Correct Answer: A — Kc is temperature dependent
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Q. Which of the following statements is true regarding the Langmuir adsorption isotherm?
A.
It assumes a monolayer adsorption.
B.
It applies to multilayer adsorption.
C.
It is temperature independent.
D.
It is only applicable to gases.
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Solution
The Langmuir adsorption isotherm assumes that adsorption occurs in a monolayer on a surface with a finite number of identical sites.
Correct Answer: A — It assumes a monolayer adsorption.
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Q. Which of the following statements is true regarding the molecular orbital configuration of O2?
A.
It has 2 unpaired electrons
B.
It has 4 unpaired electrons
C.
It is diamagnetic
D.
It has a bond order of 3
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Solution
O2 has 2 unpaired electrons in its molecular orbital configuration, making it paramagnetic.
Correct Answer: A — It has 2 unpaired electrons
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Q. Which of the following statements is true regarding 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, such as paramagnetism in O2.
Correct Answer: B — It explains the magnetic properties of molecules.
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Q. Which of the following statements is true regarding the rate of a reaction?
A.
It increases with increasing temperature
B.
It decreases with increasing concentration
C.
It is constant for all reactions
D.
It is independent of the nature of reactants
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Solution
The rate of a reaction generally increases with increasing temperature.
Correct Answer: A — It increases with increasing temperature
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Q. Which of the following statements is true regarding the rate of reaction?
A.
It is always constant
B.
It decreases with time for a reactant
C.
It increases with time for a product
D.
Both B and C
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Solution
The rate of reaction decreases with time for a reactant and increases with time for a product.
Correct Answer: D — Both B and C
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Q. Which of the following statements is true regarding the Van der Waals equation?
A.
It accounts for the volume of gas particles.
B.
It is only applicable to ideal gases.
C.
It does not consider intermolecular forces.
D.
It is a linear equation.
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Solution
The Van der Waals equation accounts for the volume of gas particles and intermolecular forces.
Correct Answer: A — It accounts for the volume of gas particles.
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Q. Which of the following states of matter can be compressed the most?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Gases can be compressed the most due to the large spaces between particles.
Correct Answer: C — Gas
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Q. Which of the following states of matter has a definite shape and volume?
A.
Gas
B.
Liquid
C.
Solid
D.
Plasma
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Solution
Solids have a definite shape and volume due to closely packed particles.
Correct Answer: C — Solid
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