Q. What is the effect of a catalyst on the equilibrium position of a reversible reaction?
A.
Shifts the equilibrium to the right
B.
Shifts the equilibrium to the left
C.
No effect on equilibrium position
D.
Increases the equilibrium constant
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Solution
A catalyst does not affect the position of equilibrium; it only speeds up the rate at which equilibrium is reached.
Correct Answer: C — No effect on equilibrium position
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Q. What is the effect of a non-volatile solute on the boiling point of a solvent?
A.
It decreases the boiling point
B.
It increases the boiling point
C.
It has no effect
D.
It changes the boiling point unpredictably
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Solution
The addition of a non-volatile solute raises the boiling point of the solvent, a phenomenon known as boiling point elevation.
Correct Answer: B — It increases the boiling point
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Q. What is the effect of adding a catalyst to a chemical equilibrium?
A.
Increases the yield of products
B.
Increases the rate of reaction
C.
Shifts the equilibrium position
D.
Has no effect on the equilibrium
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Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus having no effect on the position of equilibrium.
Correct Answer: D — Has no effect on the equilibrium
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Q. What is the effect of adding a catalyst to a system at equilibrium?
A.
Increases the rate of the forward reaction only
B.
Increases the rate of the reverse reaction only
C.
Increases the rate of both forward and reverse reactions
D.
Shifts the equilibrium position
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Solution
A catalyst increases the rate of both the forward and reverse reactions equally, thus it does not shift the position of equilibrium.
Correct Answer: C — Increases the rate of both forward and reverse reactions
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Q. What is the effect of adding a common ion to a saturated solution?
A.
Increases solubility
B.
Decreases solubility
C.
No effect on solubility
D.
Changes the pH
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Solution
Adding a common ion decreases the solubility of a salt in a saturated solution due to the common ion effect.
Correct Answer: B — Decreases solubility
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Q. What is the effect of adding a non-volatile solute to a solvent on the vapor pressure of the solvent?
A.
It increases the vapor pressure.
B.
It decreases the vapor pressure.
C.
It has no effect on the vapor pressure.
D.
It doubles the vapor pressure.
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Solution
Adding a non-volatile solute decreases the vapor pressure of the solvent due to the reduction in the mole fraction of the solvent.
Correct Answer: B — It decreases the vapor pressure.
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Q. What is the effect of adding a solute to a solvent on the boiling point of the solution?
A.
Boiling point decreases
B.
Boiling point remains the same
C.
Boiling point increases
D.
Boiling point becomes unpredictable
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Solution
Adding a solute to a solvent increases the boiling point of the solution, a phenomenon known as boiling point elevation.
Correct Answer: C — Boiling point increases
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Q. What is the effect of adding a strong acid to a buffer solution?
A.
pH increases
B.
pH decreases significantly
C.
pH remains relatively constant
D.
pH becomes neutral
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Solution
A buffer solution is designed to resist changes in pH, so adding a strong acid will cause only a small change in pH.
Correct Answer: C — pH remains relatively constant
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Q. What is the effect of adding a strong base to a buffer solution?
A.
pH decreases
B.
pH increases
C.
pH remains constant
D.
Buffer capacity increases
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Solution
Adding a strong base to a buffer solution will increase the pH, but the buffer will resist significant changes in pH due to the presence of the weak acid.
Correct Answer: B — pH increases
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Q. What is the effect of adding an inert gas at constant volume on the equilibrium of a reaction?
A.
Shifts the equilibrium to the right
B.
Shifts the equilibrium to the left
C.
No effect on the equilibrium position
D.
Increases the equilibrium constant
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Solution
Adding an inert gas at constant volume does not change the partial pressures of the reactants and products, thus it has no effect on the equilibrium position.
Correct Answer: C — No effect on the equilibrium position
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Q. What is the effect of adding an inert gas at constant volume on the equilibrium of the reaction A(g) ⇌ B(g)?
A.
Shifts to the right
B.
Shifts to the left
C.
No effect
D.
Increases the rate of reaction
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Solution
Adding an inert gas at constant volume does not change the partial pressures of the reactants or products, hence no effect on equilibrium.
Correct Answer: C — No effect
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Q. What is the effect of adding an inert gas at constant volume on the equilibrium position?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase the rate of reaction
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Solution
Adding an inert gas at constant volume does not change the partial pressures of the reactants and products, so the equilibrium position remains unchanged.
Correct Answer: C — No change
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Q. What is the effect of dilution on the pH of a strong acid solution?
A.
pH increases
B.
pH decreases
C.
pH remains constant
D.
pH becomes neutral
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Solution
Diluting a strong acid decreases its concentration, which increases the pH (making it less acidic).
Correct Answer: A — pH increases
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Q. What is the effect of dilution on the pH of a strong acid?
A.
pH increases
B.
pH decreases
C.
pH remains constant
D.
pH becomes neutral
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Solution
Dilution of a strong acid decreases its concentration, thus increasing the pH.
Correct Answer: A — pH increases
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Q. What is the effect of dilution on the pH of a weak acid solution?
A.
pH decreases
B.
pH increases
C.
pH remains constant
D.
pH becomes neutral
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Solution
Dilution of a weak acid decreases its concentration, which shifts the equilibrium to the right, increasing the concentration of H+ ions and thus increasing the pH.
Correct Answer: B — pH increases
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Q. What is the effect of increasing electronegativity difference on bond character?
A.
Increases covalent character
B.
Decreases ionic character
C.
Increases ionic character
D.
No effect
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Solution
Increasing electronegativity difference between two atoms leads to an increase in ionic character of the bond.
Correct Answer: C — Increases ionic character
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Q. What is the effect of increasing pressure on the boiling point of a liquid?
A.
Boiling point decreases
B.
Boiling point increases
C.
No effect
D.
Boiling point becomes constant
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Solution
Increasing pressure raises the boiling point of a liquid.
Correct Answer: B — Boiling point increases
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Q. What is the effect of increasing temperature on a reaction with a negative ΔH and positive ΔS?
A.
It makes ΔG more negative.
B.
It makes ΔG less negative.
C.
It has no effect on ΔG.
D.
It makes ΔG positive.
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Solution
Increasing temperature will make ΔG more negative for a reaction with a negative ΔH and positive ΔS, enhancing spontaneity.
Correct Answer: A — It makes ΔG more negative.
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Q. What is the effect of increasing temperature on a reaction with ΔH > 0 and ΔS < 0?
A.
Increases spontaneity
B.
Decreases spontaneity
C.
No effect on spontaneity
D.
Makes it spontaneous at high temperatures
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Solution
For a reaction with ΔH > 0 and ΔS < 0, increasing temperature will make ΔG more positive, thus decreasing spontaneity.
Correct Answer: B — Decreases spontaneity
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Q. What is the effect of increasing temperature on an exothermic reaction at equilibrium?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase the rate of reaction
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer: B — Shift to the left
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Q. What is the effect of increasing temperature on physisorption?
A.
Increases adsorption
B.
Decreases adsorption
C.
No effect
D.
Depends on the adsorbate
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Solution
Increasing temperature generally decreases physisorption because it disrupts the weak van der Waals forces.
Correct Answer: B — Decreases adsorption
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Q. What is the effect of increasing temperature on the cell potential according to the Nernst equation?
A.
Increases cell potential
B.
Decreases cell potential
C.
No effect
D.
Depends on the reaction
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Solution
The effect of increasing temperature on cell potential depends on the reaction and its enthalpy change.
Correct Answer: D — Depends on the reaction
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Q. What is the effect of increasing temperature on the cell potential?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the reaction
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Solution
The effect of temperature on cell potential depends on the reaction and its enthalpy change.
Correct Answer: D — Depends on the reaction
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Q. What is the effect of increasing temperature on the density of liquids?
A.
Density increases
B.
Density decreases
C.
Density remains constant
D.
Density fluctuates randomly
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Solution
Generally, the density of liquids decreases with an increase in temperature.
Correct Answer: B — Density decreases
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Q. What is the effect of increasing temperature on the entropy of a substance?
A.
Entropy decreases
B.
Entropy increases
C.
Entropy remains constant
D.
Entropy becomes zero
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Solution
Increasing temperature generally increases the kinetic energy of particles, leading to greater disorder and thus an increase in entropy.
Correct Answer: B — Entropy increases
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Q. What is the effect of increasing temperature on the entropy of a system?
A.
Increases entropy
B.
Decreases entropy
C.
No effect
D.
Depends on the system
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Solution
Increasing temperature generally increases the entropy of a system as the molecular motion becomes more chaotic.
Correct Answer: A — Increases entropy
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Q. What is the effect of increasing temperature on the equilibrium constant Kc for an endothermic reaction?
A.
Kc increases
B.
Kc decreases
C.
Kc remains constant
D.
Kc becomes zero
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Solution
For endothermic reactions, increasing temperature shifts the equilibrium to the right, increasing Kc.
Correct Answer: A — Kc increases
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Q. What is the effect of increasing temperature on the equilibrium constant of an exothermic reaction?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
According to Le Chatelier's principle, increasing the temperature of an exothermic reaction shifts the equilibrium to the left, decreasing the equilibrium constant.
Correct Answer: B — Decreases
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Q. What is the effect of increasing temperature on the equilibrium constant of an endothermic reaction?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on the reaction
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Solution
For an endothermic reaction, increasing the temperature increases the equilibrium constant.
Correct Answer: A — Increases
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Q. What is the effect of increasing temperature on the kinetic energy of gas molecules?
A.
Increases kinetic energy
B.
Decreases kinetic energy
C.
No effect
D.
Depends on the gas
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Solution
Increasing temperature increases the kinetic energy of gas molecules.
Correct Answer: A — Increases kinetic energy
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