Q. What does a positive ΔG indicate about a reaction?
-
A.
The reaction is spontaneous.
-
B.
The reaction is non-spontaneous.
-
C.
The reaction is at equilibrium.
-
D.
The reaction releases energy.
Solution
A positive ΔG indicates that the reaction is non-spontaneous.
Correct Answer: B — The reaction is non-spontaneous.
Learn More →
Q. What does a positive ΔG indicate about the spontaneity of a reaction?
-
A.
The reaction is spontaneous.
-
B.
The reaction is non-spontaneous.
-
C.
The reaction is at equilibrium.
-
D.
The reaction is exothermic.
Solution
A positive ΔG indicates that the reaction is non-spontaneous.
Correct Answer: B — The reaction is non-spontaneous.
Learn More →
Q. What does a positive ΔS indicate about a system?
-
A.
The system is becoming more ordered.
-
B.
The system is becoming more disordered.
-
C.
The reaction is non-spontaneous.
-
D.
The reaction is at equilibrium.
Solution
A positive ΔS indicates an increase in disorder or randomness in the system.
Correct Answer: B — The system is becoming more disordered.
Learn More →
Q. What does a ΔG value of zero indicate about a reaction?
-
A.
The reaction is spontaneous.
-
B.
The reaction is at equilibrium.
-
C.
The reaction is non-spontaneous.
-
D.
The reaction is exothermic.
Solution
A ΔG value of zero indicates that the reaction is at equilibrium, meaning the forward and reverse reactions occur at the same rate.
Correct Answer: B — The reaction is at equilibrium.
Learn More →
Q. What does Raoult's Law state about the vapor pressure of a solution?
-
A.
It is directly proportional to the mole fraction of the solvent.
-
B.
It is inversely proportional to the mole fraction of the solute.
-
C.
It is equal to the vapor pressure of the solute.
-
D.
It is independent of temperature.
Solution
Raoult's Law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent.
Correct Answer: A — It is directly proportional to the mole fraction of the solvent.
Learn More →
Q. What does the Gibbs free energy change indicate?
-
A.
Spontaneity of a reaction
-
B.
Rate of a reaction
-
C.
Equilibrium constant
-
D.
Activation energy
Solution
The Gibbs free energy change indicates the spontaneity of a reaction; a negative value suggests spontaneity.
Correct Answer: A — Spontaneity of a reaction
Learn More →
Q. What does the term 'enthalpy of reaction' refer to?
-
A.
The heat absorbed or released at constant pressure
-
B.
The change in internal energy
-
C.
The work done by the system
-
D.
The temperature change during a reaction
Solution
The enthalpy of reaction refers to the heat absorbed or released at constant pressure.
Correct Answer: A — The heat absorbed or released at constant pressure
Learn More →
Q. What does the term 'entropy' refer to in thermodynamics?
-
A.
Energy stored in a system
-
B.
Disorder or randomness in a system
-
C.
Heat content of a system
-
D.
Pressure of a system
Solution
Entropy is a measure of the disorder or randomness in a system.
Correct Answer: B — Disorder or randomness in a system
Learn More →
Q. What does the term 'Gibbs free energy' indicate?
-
A.
The total energy of a system
-
B.
The energy available to do work
-
C.
The heat content of a system
-
D.
The entropy of a system
Solution
Gibbs free energy indicates the maximum reversible work that can be performed by a thermodynamic system at constant temperature and pressure.
Correct Answer: B — The energy available to do work
Learn More →
Q. What effect does increasing temperature have on the Gibbs Free Energy of an endothermic reaction?
-
A.
ΔG increases.
-
B.
ΔG decreases.
-
C.
ΔG remains constant.
-
D.
ΔG becomes zero.
Solution
For an endothermic reaction, increasing temperature generally decreases ΔG, making the reaction more favorable.
Correct Answer: B — ΔG decreases.
Learn More →
Q. What effect does increasing the concentration of a reactant have on the rate of a first-order reaction?
-
A.
Increases the rate
-
B.
Decreases the rate
-
C.
No effect
-
D.
Rate becomes zero
Solution
Increasing the concentration of a reactant in a first-order reaction increases the rate of the reaction.
Correct Answer: A — Increases the rate
Learn More →
Q. What happens to the boiling point of a liquid when the atmospheric pressure decreases?
-
A.
It increases.
-
B.
It decreases.
-
C.
It remains the same.
-
D.
It becomes unpredictable.
Solution
The boiling point of a liquid decreases with a decrease in atmospheric pressure.
Correct Answer: B — It decreases.
Learn More →
Q. What happens to the boiling point of a solvent when a non-volatile solute is added?
-
A.
It decreases
-
B.
It remains the same
-
C.
It increases
-
D.
It becomes zero
Solution
The boiling point of a solvent increases when a non-volatile solute is added due to boiling point elevation.
Correct Answer: C — It increases
Learn More →
Q. What happens to the entropy of a system when it undergoes an irreversible process?
-
A.
It decreases
-
B.
It remains constant
-
C.
It increases
-
D.
It becomes zero
Solution
The entropy of a system increases when it undergoes an irreversible process.
Correct Answer: C — It increases
Learn More →
Q. What happens to the equilibrium constant if the reaction is reversed?
-
A.
K remains the same
-
B.
K is doubled
-
C.
K is inverted
-
D.
K is halved
Solution
When a reaction is reversed, the equilibrium constant for the reverse reaction is the reciprocal of the equilibrium constant for the forward reaction.
Correct Answer: C — K is inverted
Learn More →
Q. What happens to the equilibrium constant when a reaction is reversed?
-
A.
It remains the same
-
B.
It doubles
-
C.
It is inverted
-
D.
It is halved
Solution
When a reaction is reversed, the equilibrium constant is inverted (1/K).
Correct Answer: C — It is inverted
Learn More →
Q. What happens to the freezing point of a solvent when a non-volatile solute is added?
-
A.
It increases
-
B.
It decreases
-
C.
It remains the same
-
D.
It fluctuates
Solution
The freezing point of a solvent decreases when a non-volatile solute is added, a phenomenon known as freezing point depression.
Correct Answer: B — It decreases
Learn More →
Q. What happens to the kinetic energy of particles as a substance changes from solid to liquid?
-
A.
It decreases
-
B.
It remains the same
-
C.
It increases
-
D.
It fluctuates
Solution
The kinetic energy of particles increases as they gain energy to overcome intermolecular forces during melting.
Correct Answer: C — It increases
Learn More →
Q. What happens to the pressure of a gas if the volume is doubled at constant temperature?
-
A.
It doubles
-
B.
It halves
-
C.
It remains the same
-
D.
It quadruples
Solution
According to Boyle's Law, if the volume is doubled at constant temperature, the pressure halves.
Correct Answer: B — It halves
Learn More →
Q. What happens to the pressure of a gas if the volume is halved at constant temperature?
-
A.
It doubles
-
B.
It halves
-
C.
It remains the same
-
D.
It quadruples
Solution
According to Boyle's Law, if the volume is halved, the pressure doubles at constant temperature.
Correct Answer: A — It doubles
Learn More →
Q. What happens to the pressure of a gas if the volume is halved while the temperature remains constant?
-
A.
Pressure doubles
-
B.
Pressure halves
-
C.
Pressure remains the same
-
D.
Pressure quadruples
Solution
According to Boyle's Law, if the volume is halved, the pressure doubles.
Correct Answer: A — Pressure doubles
Learn More →
Q. What happens to the vapor pressure of a solution as the concentration of a non-volatile solute increases?
-
A.
It increases.
-
B.
It decreases.
-
C.
It remains constant.
-
D.
It fluctuates.
Solution
As the concentration of a non-volatile solute increases, the vapor pressure of the solution decreases according to Raoult's Law.
Correct Answer: B — It decreases.
Learn More →
Q. What happens to the vapor pressure of a solvent when a non-volatile solute is added?
-
A.
It increases
-
B.
It decreases
-
C.
It remains the same
-
D.
It fluctuates
Solution
The vapor pressure of a solvent decreases when a non-volatile solute is added due to the solute particles occupying space at the surface.
Correct Answer: B — It decreases
Learn More →
Q. What happens to the vapor pressure of a solvent when a volatile solute is added?
-
A.
It increases.
-
B.
It decreases.
-
C.
It remains the same.
-
D.
It becomes zero.
Solution
The addition of a volatile solute decreases the vapor pressure of the solvent due to the presence of solute molecules.
Correct Answer: B — It decreases.
Learn More →
Q. What happens to the volume of a gas if the temperature is increased at constant pressure?
-
A.
It decreases
-
B.
It increases
-
C.
It remains the same
-
D.
It becomes zero
Solution
According to Charles's law, the volume of a gas increases with an increase in temperature at constant pressure.
Correct Answer: B — It increases
Learn More →
Q. What happens to the volume of a gas when the pressure is increased at constant temperature?
-
A.
Increases
-
B.
Decreases
-
C.
Remains the same
-
D.
Becomes zero
Solution
According to Boyle's Law, the volume of a gas decreases when pressure increases at constant temperature.
Correct Answer: B — Decreases
Learn More →
Q. What is Raoult's Law primarily used to describe?
-
A.
The behavior of ideal gases
-
B.
The vapor pressure of solutions
-
C.
The boiling point elevation
-
D.
The freezing point depression
Solution
Raoult's Law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent.
Correct Answer: B — The vapor pressure of solutions
Learn More →
Q. What is Raoult's Law primarily used to determine?
-
A.
Vapor pressure of a solution
-
B.
Boiling point elevation
-
C.
Freezing point depression
-
D.
Molarity of a solution
Solution
Raoult's Law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent.
Correct Answer: A — Vapor pressure of a solution
Learn More →
Q. What is the boiling point elevation of a solution containing 1 mol of NaCl in 1 kg of water? (K_b for water = 0.512 °C kg/mol)
-
A.
0.512 °C
-
B.
1.024 °C
-
C.
1.536 °C
-
D.
2.048 °C
Solution
Boiling point elevation = i * K_b * m = 2 * 0.512 * 1 = 1.024 °C (i = 2 for NaCl)
Correct Answer: B — 1.024 °C
Learn More →
Q. What is the boiling point of a liquid?
-
A.
The temperature at which vapor pressure equals atmospheric pressure
-
B.
The temperature at which a liquid freezes
-
C.
The temperature at which a liquid evaporates
-
D.
The temperature at which a liquid condenses
Solution
The boiling point is defined as the temperature at which the vapor pressure of a liquid equals the atmospheric pressure.
Correct Answer: A — The temperature at which vapor pressure equals atmospheric pressure
Learn More →
Showing 481 to 510 of 1494 (50 Pages)
