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What does a horizontal arrest in a cooling system refer to?

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in Engineering Chemistry I by (506k points)
What does a horizontal arrest in a cooling system refer to?

(a) Continuous cooling

(b) Invariant reaction

(c) Variant reaction

(d) Bi variant reaction

The question was posed to me in an online quiz.

The query is from One Component System in portion Phase Rule of Engineering Chemistry I

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Right choice is (b) Invariant reaction

The best I can explain: Horizontal arrest refers to the equilibrium state of the system where the degree of freedom is 0 (as all the phases co-exist) and hence this state is referred to as invariant reaction (unique point).

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