WB JEE 2026 | Thermodynamics Question 1 | Chemistry

WB JEE 2026

MCQ (Single Correct Answer)

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Three engines $\mathrm{A}, \mathrm{B}$ and C take steam at $130^{\circ} \mathrm{C}$ and reject it at $20^{\circ} \mathrm{C}, 40^{\circ} \mathrm{C}$ and $50^{\circ} \mathrm{C}$ respectively．The most efficient engine will be

All the three engines will be equally efficient

WB JEE 2024

MCQ (Single Correct Answer)

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Which of the following statements is correct for a spontaneous polymerization reaction ?

$$\mathrm{\Delta G<0, \Delta H<0, \Delta S<0}$$

$$\Delta \mathrm{G}<0, \Delta \mathrm{H}>0, \Delta \mathrm{S}>0$$

$$\mathrm{\Delta G>0, \Delta H<0, \Delta S>0}$$

$$\Delta \mathrm{G}>0, \Delta \mathrm{H}>0, \Delta \mathrm{S}>0$$

WB JEE 2024

MCQ (Single Correct Answer)

-0.25

For a spontaneous process, the incorrect statement is

$$ \left(\Delta \mathrm{G}_{\text {system }}\right)_{\mathrm{T}, \mathrm{P}}>0 $$

$$ \left(\Delta \mathrm{S}_{\text {system }}\right)+\left(\Delta \mathrm{S}_{\text {surroundings }}\right)>0 $$

$$ \left(\Delta \mathrm{G}_{\text {system }}\right)_{\mathrm{T}, \mathrm{P}}<0 $$

$$ \left(\Delta U_{\text {system }}\right)_{S, v}<0 $$

WB JEE 2021

MCQ (Single Correct Answer)

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For a spontaneous reaction at all temperatures which of the following is correct?

Both $$\Delta$$H and $$\Delta$$S are positive

$$\Delta$$H is positive and $$\Delta$$S is negative

$$\Delta$$H is negative and $$\Delta$$S is positive

Both $$\Delta$$H and $$\Delta$$S are negative

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