A particular reaction at 27- C for which the change in enthalpy and the change in entropy are both positive is found to be non-spontaneous- The reaction may proceed spontaneously if-A- the temperature is kept constantB- it is carried out in an open vessel at 27- CC- the temperature is decreasedD- the temperature is increased

The correct option is D the temperature is increasedΔG = nbsp;ΔH TΔS According to this equation, When nbsp;ΔH and nbsp;ΔS are positive and the reaction ...

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Standard XII

Chemistry

Second Law of Thermodynamics

A particular ...

Question

A particular reaction at 27ºC for which the change in enthalpy and the change in entropy are both positive is found to be non-spontaneous. The reaction may proceed spontaneously if:

the temperature is decreased

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the temperature is increased

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the temperature is kept constant

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it is carried out in an open vessel at 27ºC

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Solution

The correct option is B the temperature is increased
$Δ$ G = $Δ$ H - T $Δ$ S
According to this equation,
When $Δ$ H and $Δ$ S are positive and the reaction is non-spontaneous, $Δ$ H is more negative than T $Δ$ S.
To make the reaction spontaneous, $Δ$ G needs to become negative. This happens when T $Δ$ S increases, i.e. T increases.

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