Major Competitive Exams
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 pressure on the equilibrium of the reaction: 2N2(g) + 3H2(g) ⇌ 2NH3(g)? (2021)
A.
Shift to the left
B.
Shift to the right
C.
No effect
D.
Increase in temperature
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Solution
Increasing pressure shifts the equilibrium towards the side with fewer moles of gas. In this case, it shifts to the right, producing more NH3.
Correct Answer: B — Shift to the right
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Q. What is the effect of increasing resistance in a series RLC circuit at resonance? (2023)
A.
Increases current
B.
Decreases current
C.
No effect on current
D.
Increases voltage
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Solution
Increasing resistance in a series RLC circuit at resonance will decrease the current, as the impedance increases.
Correct Answer: B — Decreases current
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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 chemisorption? (2022)
A.
Increases adsorption
B.
Decreases adsorption
C.
No effect
D.
Depends on the gas
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Solution
Chemisorption is an exothermic process, and increasing temperature generally decreases the extent of chemisorption.
Correct Answer: B — Decreases adsorption
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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 a gas?
A.
Increases density
B.
Decreases density
C.
No effect
D.
Depends on pressure
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Solution
Increasing the temperature of a gas generally decreases its density, as the gas expands.
Correct Answer: B — Decreases density
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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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Q. What is the effect of increasing temperature on the kinetic energy of gas particles?
A.
It decreases kinetic energy.
B.
It has no effect.
C.
It increases kinetic energy.
D.
It causes phase change.
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Solution
Increasing temperature increases the kinetic energy of gas particles.
Correct Answer: C — It increases kinetic energy.
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Q. What is the effect of increasing temperature on the kinetic energy of particles in a substance?
A.
Kinetic energy decreases
B.
Kinetic energy remains constant
C.
Kinetic energy increases
D.
Kinetic energy fluctuates
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Solution
Increasing temperature increases the kinetic energy of particles in a substance.
Correct Answer: C — Kinetic energy increases
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Q. What is the effect of increasing temperature on the kinetic energy of particles in a solid? (2023)
A.
Decreases kinetic energy
B.
Increases kinetic energy
C.
No effect
D.
Causes phase change
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Solution
Increasing temperature increases the kinetic energy of particles, leading to potential phase change.
Correct Answer: B — Increases kinetic energy
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Q. What is the effect of increasing temperature on the pressure of a gas at constant volume?
A.
Pressure decreases
B.
Pressure remains constant
C.
Pressure increases
D.
Pressure fluctuates
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Solution
According to Gay-Lussac's law, pressure increases with temperature at constant volume.
Correct Answer: C — Pressure increases
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Q. What is the effect of increasing temperature on the rate of a chemical reaction?
A.
Decreases the rate
B.
Increases the rate
C.
No effect
D.
Depends on the reaction
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Solution
Increasing temperature generally increases the rate of a chemical reaction.
Correct Answer: B — Increases the rate
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Q. What is the effect of increasing temperature on the solubility of most solid solutes in water?
A.
Increases solubility
B.
Decreases solubility
C.
No effect
D.
Depends on the solute
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Solution
For most solid solutes, increasing temperature increases solubility in water.
Correct Answer: A — Increases solubility
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Q. What is the effect of increasing temperature on the speed of sound in air?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on pressure
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Solution
Increasing temperature increases the speed of sound in air.
Correct Answer: A — Increases
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Q. What is the effect of increasing temperature on the vapor pressure of a liquid?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It fluctuates
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Solution
Increasing temperature increases the kinetic energy of the molecules, leading to an increase in vapor pressure.
Correct Answer: C — It increases
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Q. What is the effect of increasing temperature on the vapor pressure of a solution?
A.
It decreases the vapor pressure.
B.
It increases the vapor pressure.
C.
It has no effect.
D.
It causes the vapor pressure to become zero.
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Solution
Increasing temperature generally increases the vapor pressure of a solution due to increased kinetic energy of the molecules.
Correct Answer: B — It increases the vapor pressure.
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Q. What is the effect of increasing temperature on the vapor pressure of a solvent according to Raoult's Law?
A.
It decreases the vapor pressure.
B.
It increases the vapor pressure.
C.
It has no effect.
D.
It depends on the solute.
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Solution
Increasing temperature generally increases the vapor pressure of a solvent, as more molecules have enough energy to escape into the vapor phase.
Correct Answer: B — It increases the vapor pressure.
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Q. What is the effect of increasing temperature on the viscosity of a liquid?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the liquid
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Solution
Increasing temperature generally decreases the viscosity of a liquid.
Correct Answer: B — Decreases viscosity
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Q. What is the effect of increasing temperature on the volume of a gas at constant pressure?
A.
Volume decreases
B.
Volume increases
C.
Volume remains constant
D.
Volume fluctuates
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Solution
According to Charles's Law, increasing the temperature of a gas at constant pressure increases its volume.
Correct Answer: B — Volume increases
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