Identify which of the following statements is FALSE?

The vapor pressure of a liquid decreases with increasing atmospheric pressure.

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The value of an equilibrium constant is dependent on temperature.

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The rate of a spontaneous reaction cannot be determined solely by its Gibbs free energy.

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During a phase transition, the temperature of a substance must be constant.

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The addition of a catalyst to a reaction at equilibrium has no net effect on the system.

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Solution

The correct option is D During a phase transition, the temperature of a substance must be constant.
since, during the phase transition; temperature is plotted at the x-axis of the phase transition curve, hence, during phase transition, temperature is not constant.

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Similar questions

ASSERTION(A): For every chemical reaction at equilibrium, standard Gibbs energy of the reaction is zero.
REASON(R): At constant temperature and pressure, chemical reactions are spontaneous in the direction of the decreasing Gibbs energy.

Q. Assertion: For every chemical reaction at equilibrium, the standard Gibbs energy of reaction is zero.
Reason: At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

Q. Select the correct statements.
a. There is asymmetry between converting work to heat and converting heat to work.
b. No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.
c. For every chemical reaction at equilibrium, standard change in Gibbs free energy is zero.
d. At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

A change in the free energy of a system at constant temperature and pressure will be:

Δ_{s y s} G = Δ_{s y s} H - T Δ_{s y s} S

At constant temperature and pressure,

Δ_{s y s} G < 0 (s p o n t a n e o u s)

Δ_{s y s} G = 0 (e q u i l i b r i u m)

Δ_{s y s} G > 0 (n o n - s p o n t a n e o u s)

A reaction has positive values of

Δ H

and

Δ S

From this you can deduce that the reaction:

Q. Statement - I
A cylinder fitted with a movable piston contains a certain amount of liquid in equilibrium with its vapor. The temperature of the system is kept constant. If the volume of the vapor is decreased by moving the piston inwards, the vapor pressure will remain unchanged.
Statement - II
Vapor, in equilibrium with its liquid, at constant temperature does not obey Boyle's law.

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Identify which of the following statements is FALSE?

The correct option is D During a phase transition, the temperature of a substance must be constant.since, during the phase transition; temperature is plotted at the x-axis of the phase transition curve, hence, during phase transition, temperature is not constant.

The correct option is D During a phase transition, the temperature of a substance must be constant.
since, during the phase transition; temperature is plotted at the x-axis of the phase transition curve, hence, during phase transition, temperature is not constant.