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  1. For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is

  2. A.

     X

    B.

     X + 1

    C.

     X + 2

    D.

     X + 3

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    Answer : Option C

    Explanation :

    Since, phase rule is f(degree of freedom)=C−∅+2
    Where, C=  number of components, ∅=  number of phases,
    ⇒∅=C−f+2
    So for maximum phases f should be minimum f cant be negative since it denotes number of variables hence f=0
    So, ∅=C+2
    Given C=X⇒∅=X+2


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