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5 November, 17:36

In a binary system, what is the maximum number of phases that can co-exist under the equilibrium conditions? One a b Two Three C d Four

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  1. 5 November, 17:44
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    D) Four

    Explanation:

    Using phase rule,

    F = C - P + 2

    where,

    C is the number of components in the system. For example, for binary systems, C=2

    P indicates the number of phase of the component. It is defined as homogeneous chemical composition of the substance. Thus, two immiscible liquids with definite boundaries form 2 phases.

    F is the number of variables. For example, variables like temperature, pressure, mole fraction, etc.

    Thus, using this

    C = 2

    For P to be maximum, F has to be 0. This is the condition when all the variable of the binary system is known.

    So,

    F = C - P + 2

    0 = 2 - P + 2

    P = 4
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