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Chemistry · PYQ NEET UG 2016(1)

हिन्दी

The CORRECT thermodynamic conditions for the spontaneous reaction at all temperatures is

  1. \( \Delta H < 0 \) and \( \Delta S = 0 \)
  2. \( \Delta H < 0 \) and \( \Delta S < 0 \)
  3. \( \Delta H < 0 \) and \( \Delta S > 0 \)
  4. \( \Delta H > 0 \) and \( \Delta S < 0 \)

Correct answer · Option 3

\( \Delta H < 0 \) and \( \Delta S > 0 \)

Explanation

For a reaction to be spontaneous at all temperatures, Gibbs free energy change \( \Delta G = \Delta H - T\Delta S \) must be negative at any \( T \), which requires \( \Delta H < 0 \) and \( \Delta S > 0 \).
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