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With reference to a two component system, an isobar indicates _______

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With reference to a two component system, an isobar indicates _______

(a) A region where the temperature remains constant

(b) An area below  phase end products remains

(c) An area above which only the liquid vapors remains

(d) A region where the composition lies in equilibrium

I have been asked this question during an interview.

My query is from Two Component System topic in section Phase Rule of Engineering Chemistry I

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The correct choice is (d) A region where the composition lies in equilibrium

For explanation: An isobar is a line that indicates a region where the composition remains constant and in the equilibrium state. In a two component solid-liquid system, it is drawn vertically covering a wide range of temperatures.

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