OnlineCBT
Chemistry · THERMODYNAMICS
हिन्दीMatch List-I with List-II: List-I (Signs of \( \Delta_r H^\circ \) & \( \Delta_r S^\circ \)) List-II (Spontaneity Condition) A \( \Delta_r H^\circ < 0 \), \( \Delta_r S^\circ > 0 \) I Spontaneous only at low temperature B \( \Delta_r H^\circ < 0 \), \( \Delta_r S^\circ < 0 \) II Spontaneous at all temperatures C \( \Delta_r H^\circ > 0 \), \( \Delta_r S^\circ > 0 \) III Nonspontaneous at all temperatures D \( \Delta_r H^\circ > 0 \), \( \Delta_r S^\circ < 0 \) IV Spontaneous only at high temperature Choose the correct answer from the options given below:
Match List-I with List-II:
| List-I (Signs of \( \Delta_r H^\circ \) & \( \Delta_r S^\circ \)) | List-II (Spontaneity Condition) | ||
|---|---|---|---|
| A | \( \Delta_r H^\circ < 0 \), \( \Delta_r S^\circ > 0 \) | I | Spontaneous only at low temperature |
| B | \( \Delta_r H^\circ < 0 \), \( \Delta_r S^\circ < 0 \) | II | Spontaneous at all temperatures |
| C | \( \Delta_r H^\circ > 0 \), \( \Delta_r S^\circ > 0 \) | III | Nonspontaneous at all temperatures |
| D | \( \Delta_r H^\circ > 0 \), \( \Delta_r S^\circ < 0 \) | IV | Spontaneous only at high temperature |
Choose the correct answer from the options given below:
Correct answer · Option 3
A-(II), B-(I), C-(IV), D-(III)
Explanation
\( \Delta H < 0, \Delta S > 0 \rightarrow \) spontaneous at all T (A-II). \( \Delta H < 0, \Delta S < 0 \rightarrow \) spontaneous at low T (B-I). \( \Delta H > 0, \Delta S > 0 \rightarrow \) spontaneous at high T (C-IV). \( \Delta H > 0, \Delta S < 0 \rightarrow \) nonspontaneous at all T (D-III).
