Statement I: Increasing temperature increases the density of point defects. Statement II: The process of formation of point defects in solids is endothermic and has \u0394S 0.

Question

Statement I: Increasing temperature increases the density of point defects. Statement II: The process of formation of point defects in solids is endothermic and has \u0394S > 0.

Prashant Kotian · Accepted Answer

Correct answer: A. Statement I is correct: higher temperatures increase defect concentration. Statement II is correct: creating a defect requires breaking bonds (endothermic, \u0394H > 0) and increases randomness (\u0394S > 0). According to thermodynamic relations, the free energy of defect formation (\u0394G = \u0394H - T\u0394S) becomes more negative as temperature T increases, which explains why defect density increases.

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