If the for a given reaction has a negative value, which of the following gives the correct relationships for the values of and ? [2016, 2011]

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Q.
If the $E_{cell}^{\circ}$ for a given reaction has a negative value, which of the following gives the correct relationships for the values of $Δ G °$ and $K_{e q}$ [2016, 2011]

1 $Δ G ° > 0; K_{e q} < 1$

2 $Δ G ° > 0; K_{e q} > 1$

3 $Δ G ° < 0; K_{e q} > 1$

4 $Δ G ° < 0; K_{e q} < 1$

Ans.
(1)

$Δ G ° = - n F E_{cell}^{\circ}$

If $E_{cell}^{\circ} = - ve$ then $Δ G ° = + ve i . e .; Δ G ° > 0$ .

$Δ G ° = - n R T \log K_{e q}$

For $Δ G ° = + ve, K_{e q} = - ve i . e ., K_{e q} < 1$ .

Solution

Q.
If the $E_{cell}^{\circ}$ for a given reaction has a negative value, which of the following gives the correct relationships for the values of $Δ G °$ and $K_{e q}$ [2016, 2011]

1 $Δ G ° > 0; K_{e q} < 1$

2 $Δ G ° > 0; K_{e q} > 1$

3 $Δ G ° < 0; K_{e q} > 1$

4 $Δ G ° < 0; K_{e q} < 1$

Ans.
(1)

$Δ G ° = - n F E_{cell}^{\circ}$

If $E_{cell}^{\circ} = - ve$ then $Δ G ° = + ve i . e .; Δ G ° > 0$ .

$Δ G ° = - n R T \log K_{e q}$

For $Δ G ° = + ve, K_{e q} = - ve i . e ., K_{e q} < 1$ .

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Solution

Q. If the Ecell∘ for a given reaction has a negative value, which of the following gives the correct relationships for the values of ΔG° and Keq [2016, 2011]

1 ΔG°>0 ;Keq<1

2 ΔG°>0; Keq>1

3 ΔG°<0; Keq>1

4 ΔG°<0; Keq<1

Ans. (1) ΔG°=-nFEcell∘ If Ecell∘=-ve then ΔG°=+ve i.e.; ΔG°>0. ΔG°=-nRTlogKeq For ΔG°=+ve, Keq=-ve i.e., Keq<1.

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Q.
If the $E_{cell}^{\circ}$ for a given reaction has a negative value, which of the following gives the correct relationships for the values of $Δ G °$ and $K_{e q}$ [2016, 2011]

1 $Δ G ° > 0; K_{e q} < 1$

2 $Δ G ° > 0; K_{e q} > 1$

3 $Δ G ° < 0; K_{e q} > 1$

4 $Δ G ° < 0; K_{e q} < 1$

Ans.
(1)

$Δ G ° = - n F E_{cell}^{\circ}$

If $E_{cell}^{\circ} = - ve$ then $Δ G ° = + ve i . e .; Δ G ° > 0$ .

$Δ G ° = - n R T \log K_{e q}$

For $Δ G ° = + ve, K_{e q} = - ve i . e ., K_{e q} < 1$ .