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Assertion (A): For every chemical reacti...

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

A

Both (A) and (R ) are correct, and (R ) is the correct explanation for (A).

B

Both (A) and (R ) are correct, but(R ) is not a correct explanation for (A).

C

(A) is correct, but (R ) is incorrect.

D

(A) is incorrect, but (R ) is correct.

Text Solution

Verified by Experts

(A) is false, (R ) is true.
For every chemical reaction at equilibrium standard Gibbs energy of the reaction is not zero. It is zero only for the reactions at equilibrium. At constant temperature and pressure, the chemical reactions are spontaneous in the direction of the decreasing Gibbs energy. For a reaction to be spontaneous, the free energy should decreases.
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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.

Statement -1. For every chemical reaction at equilibrium ,standard Gibbs energy of reactions is zero. Statement-2. At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy

Knowledge Check

  • statement-1 : For every chemical reaction at equilibrium standard Gibbs energy of reaction is zero. statement-2 : At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

    A
    Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.
    B
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    C
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  • Statement 1: For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero, and Statement 2: At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

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    Statement 1 is true, statement 2 is true, statement 2 is correct explanation for statement 1.
    B
    Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 1.
    C
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  • Statement 1 : For every chemical reaction at equilibrium, standard Gibbs energy of reaction is zero. Statemet 2 : At constant temperature and pressure, chemical reactions are spontaneous in the direction of decreasing Gibbs energy.

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    B
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