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प्रश्न
When water at 0°C freezes to form ice at the same temperature of 0°C, then it :
विकल्प
absorbs some heat
releases some heat
neither absorbs nor releases heat
absorbs exactly 3.34 × 105 J/kg of heat
उत्तर
releases some heat
At 0°C, water releases some heat to lower the speed of molecules, and when it is cool enough the molecules of water are fixed at one position and they start vibrating. Ultimately, the water molecules convert into ice (solid).
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