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Standard XII

Chemistry

Electrochemical Cells, Galvanic Cells

A chemical re...

Question

A chemical reaction will be non spontaneous if:

E_{c e l l}^{\circ}

is positive

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△ G^{\circ}

is negative

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reaction quotient,

Q < K

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E_{c e l l}

is negative

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Solution

The correct option is C $E_{c e l l}$ is negative
$\to$ For forward reaction, $E_{c e l l}$ should be positive.
$\to$ If $E_{c e l l}$ is negative, then reaction is non-spontaneous and reverse reaction occurs.

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Similar questions

During the working of a galvanic cell and with the passage of time:

1) Spontaneity of the cell reaction decreases, $E_{c e l l}$ decreases.

2) Reaction quotient Q decreases, $E_{c e l l}$ increases.

3) Reaction quotient Q increases, $E_{c e l l}$ decreases.

4) At equilibrium, $Q = K_{e q}, E_{c e l l} = 0$ .

Identify the correct statement(s).

Q. For a spontaneous reaction

Δ G

, equilibrium

K

and

E_{c e l l}

will be respectively:

Which of the following is not correct?
(a) $Δ$ G is zero for a reversible reaction.
(b) $Δ$ G is positive for a spontaneous reaction.
(c) $Δ$ G is negative for a spontaneous reaction.
(d) $Δ$ G is positive for a non-spontaneous reaction.

Q. Assertion :A reaction is spontaneous if

E_{c e l l} = + v e

. Reason: For

E_{c e l l} = + v e, △ G

is always

- v e

Q. Assertion :A reaction will be spontaneous if

△

H is negative and

△

S is positive Reason:

△

G will be negative when there is a decrease in enthalpy and an increase in entropy

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A chemical reaction will be non spontaneous if:

The correct option is C Ecell is negative→ For forward reaction, Ecell should be positive.→ If Ecell is negative, then reaction is non-spontaneous and reverse reaction occurs.

The correct option is C $E_{c e l l}$ is negative
$\to$ For forward reaction, $E_{c e l l}$ should be positive.
$\to$ If $E_{c e l l}$ is negative, then reaction is non-spontaneous and reverse reaction occurs.