Assertion :Increasing temperature increases the density of point defects. Reason: The process of formation of point defects in solids in endothermic and has $Δ S > 0$ .

Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion

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Both Assertion and Reason are correct but the Reason is not the correct explanation of the Assertion

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The Assertion is correct but the Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and the Reason is the correct explanation of the Assertion
As at $T = 0 K$ , According to third law of thermodynamics, a perfect crystal exists. As temperature increases the defects in the crystal increases. Therefore, formation of point defect is an endothermic process and have entropy change greater than zero. $(△ S > O)$

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Assertion :Increasing temperature increases the density of point defects. Reason: The process of formation of point defects in solids in endothermic and has ΔS>0.

Assertion :Increasing temperature increases the density of point defects. Reason: The process of formation of point defects in solids in endothermic and has $Δ S > 0$ .