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What does the term “ metastable” indicate?

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What does the term “ metastable” indicate?

(a) A place where the composition of the system remains constant

(b) A place where the pressure remains constant with low value

(c) An area below which a vapor- liquid mixture is obtained

(d) A region where the temperature remains constant

I got this question during an online interview.

This question is from Two Component System topic in portion Phase Rule of Engineering Chemistry I

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The correct option is (d) A region where the temperature remains constant

For explanation: A metastable is a line that indicates a place where the temperature remains constant. In a two component system it is drawn horizontally covering a wide range of compositions.

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