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A reaction attains equilibrium, when the...

A reaction attains equilibrium, when the free energy change is

A

`1`

B

`2`

C

`3`

D

`0`

Text Solution

Verified by Experts

The correct Answer is:
D
`0` At equilibrium `DeltaG=0`
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What is the value of free energy chnage for a reaction in equilibrium state? (b) How is free energy change related to equilibrium constant of the reaction?

A reaction attains equilibrium state under standard conditions, then:

Knowledge Check

  • Chemical equilibrium is attained in a reversible reaction carried in a close container and is of dynamic nature. The value of equilibrium constant may be expressed either as K_(p)" and " K_(c) and the two are related to each other as : K_(p) =K_(c)(RT)^(Deltang) Free energy change (DeltaG) at equilibrium point is zero. The value of equilibrium constant gives the extent to which a particular reation has proceeded to attain the equilibrium . Its value gets reversed if the reaction is reversed and becomes the square root of the initial value if the reaction is divided by 2. A reaction attains equilibrium when the free energy change accompanying the reaction is :

    A
    Positive and large
    B
    Zero
    C
    Negative
    D
    Negative and small.

  • If equilibrium constant for a reaction is K, then standard free energy change is :

    A
    `DeltaG^(@) = -RT "log K`
    B
    `DeltaG^(@) = RT "In K`
    C
    `(DeltaG^(@))/(RT) = "-log K`
    D
    `(DeltaG^(@))/(RT) = -2.303 "log K`

  • A particular reaction has a negative value for the free energy change. Then at ordinary temperature

    A
    It has a large `-ve` value for the entropy change
    B
    It has a large `+ve` value for the entropy change
    C
    It has small `+ve` value for enthalpy change
    D
    It has a `+ve` value for the entropy change and a `-ve` value for the enthalpy change

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    In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A : For every chemical reaction at equilibrium, the value of standard Gibbs free energy change is zero. R: At constant temperature and pressure for a reaction that direction is preferred for which Gibbs free energy increases.

    For the equilibrium reaction, the value of Gibbs free energy change is:

    A chemicla reaction is said to attain equilibrium when

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    (A) An electrochemical cell can be set-up only if the redox reaction is spontaneous. (R) A reaction is spontaneous if free energy change is negative.

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