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Standard XII

Chemistry

Entropy

Given Δ G =...

Question

Given $Δ G = Δ H - T Δ S$ , find the effect of temperature on the spontaneity of an endothermic reaction as with decreasing $T$ .

Becomes less spontaneous

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Becomes more spontaneous

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Does not change

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Decreases at first but then increases

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Insufficient information to make a conclusion

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Solution

The correct option is D Insufficient information to make a conclusion
Given information is insufficient to make a conclusion.
For reaction to be spontaneous, $Δ G < 0$ . For endothermic reaction, $Δ H > 0$ .
Then spontaneous nature of reaction will depend on the sign of $Δ S$ , which is not given.

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Similar questions

Q. Given that

Δ G = Δ H - T Δ S

, how is the spontaneity of an endothermic reaction to change with decreasing

T

Q. Given that

Δ G = Δ H - T Δ S

, how is the spontaneity of an endothermic reaction expected to change with decreasing

T

Q. Given

Δ G = Δ H - T Δ S

, how is the spontaneity of an endothermic reaction is affected by decreasing the

T

Q. If

Δ G = Δ H - T Δ S

and

Δ G = Δ H + T {[\frac{d (Δ G)}{d T}]}_{P}

then variation of EMF of a cell E, with temperature T, is given by:

Q. Free energy,

G = H - T Δ S

, is a state function that indicates whether a reaction is spontaneous or non-spontaneous. If you think of

T S

as the part of the system`s energy that is disordered already, then

(H - T S)

is the part of the system`s energy that is still ordered and therefore free to cause spontaneous change by becoming disordered.
Also,

Δ G = Δ H - T Δ S

From the second law of Thermodynamics, a reaction is spontaneous if

Δ_{t o t a l} S

is positive, non-spontaneous if

Δ_{t o t a l} S

is negative, and at equilibrium if

Δ_{t o t a l} S

is zero.
Since,

- T Δ S = Δ G

and since

Δ G

and

Δ S

have opposite signs, we can restate the Thermodynamic criterion for the spontaneity of a reaction carried out at a constant temperature and pressure.
If

Δ G < 0

, the reaction is spontaneous
If

Δ G > 0

, the reaction is non-spontaneous
If

Δ G = 0

, the reaction is at equilibrium
Read the above paragraph carefully and answer the following questions based on the above comprehension.

If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then:

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Given ΔG=ΔH−TΔS, find the effect of temperature on the spontaneity of an endothermic reaction as with decreasing T.

The correct option is D Insufficient information to make a conclusionGiven information is insufficient to make a conclusion.For reaction to be spontaneous, ΔG<0. For endothermic reaction, ΔH>0.Then spontaneous nature of reaction will depend on the sign of ΔS, which is not given.

Given $Δ G = Δ H - T Δ S$ , find the effect of temperature on the spontaneity of an endothermic reaction as with decreasing $T$ .