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STD 11 - 5. Thermodynamics and thermochemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 5. Thermodynamics and thermochemistry4 Marks
MCQ
Assertion : Water in liquid state is more stable than ice at room temperature.
Reason :Water in liquid form has higher entropy than ice.
  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
At room temperature water is more stable because ice will tend to melt at room temperature. So, $A$ is true. But water will have larger entropy than ice because ice absorbs heat to be converted into water. $\Delta S = \frac{{\Delta H}}{T}$ We know that greater the entropy, greater the stability. Hence, water is more stable than ice. Both $A$ and $R$ is true and $R$ explains $A$.

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