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Question

The pressure on a sample of water at its triple point is reduced while the temperature is held constant. Which phases changes are favoured?

(I) melting of ice
(II) sublimation of ice
(III) vaporization of liquid water.

A
I only
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B
III only
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C
II only
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D
II and III
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Solution

The correct option is D II and III
When you reduce the pressure further from the triple point only vapour phase existing. This vapour state may be achieved either by sublimation (solid to gas directly) or by vaporisation of liquid water. Thus option d is correct.

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