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Spontaneity

Super cooled ...

Question

Super cooled water is liquid water that has been cooled below its normal freezing point. This state is thermodynamically :

A

unstable and tends to freeze into ice spontaneously

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B

stable and tends to freeze Into ice spontaneously

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C

stable and tends to fuse into liquid spontaneously

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D

unstable and tends to fuse into liquid spontaneously

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Solution

The correct option is A unstable and tends to freeze into ice spontaneously
Super cooled water is liquid water that has been cooled below its normal freezing point. This state is thermodynamically unstable and tends to freeze into ice spontaneously. Below normal freezing point, water cannot exist in liquid state. It has to exist in solid state. Due to this, the conversion liquid water $\to$ solid ice is spontaneous.

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When a non-volatile solid is added to pure water it will

100 g

of water is super cooled to

- 10^{o} C

. At this point, due to some disturbance mechanised or otherwise some of its suddenly freezes to ice. What will be the temperature of the resultant mixture.

[S_{w} = 1 C a l / g /^{o} C

L_{f u s i o n}^{w} = 80 C a l / g]

:

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