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Chemistry · PYQ NEET UG 2017

हिन्दी

For a given reaction, \( \Delta H = 35.5\text{ kJ mol}^{-1} \) and \( \Delta S = 83.6\text{ J K}^{-1}\text{ mol}^{-1} \). The reaction is spontaneous at _______.\n(Assume that \( \Delta H \) and \( \Delta S \) do not vary with temperature)

  1. A
    \( \text{T} < 425\text{ K} \)
  2. B
    \( \text{T} > 425\text{ K} \)
  3. C
    all temperatures
  4. D
    \( \text{T} > 298\text{ K} \)
View Answer & Solution

Correct answer · Option B

\( \text{T} > 425\text{ K} \)

Explanation

For spontaneity, \( \Delta G = \Delta H - T\Delta S < 0 \Rightarrow T > \frac{\Delta H}{\Delta S} = \frac{35500}{83.6} \approx 424.6\text{ K} \approx 425\text{ K} \).
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