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P(A)= partial pressure of component A in...

`P_(A)`= partial pressure of component A in liquid mixture, `P_(A)^(@)`= vapour pressure of A, `chi_(A)`= mole fraction of A in

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`A-p,r B-q, t C-q, t D-p, s`
(A) `C_(2)H_(5)OH + H_(2)O`= Azeotropic mixture (at a particular compositon) shows positive deviation
(B) `C_(2)H_(5)Br+ C_(2)H_(5)I`= Ideal solution, obeys Raoult.s law
(C ) `P_(A) = P_(A)^(@) chi_(A)`= ideal solution (with non-volatile solute)
(D) `H_(2)O + H_(2)SO_(4)`= Azeotropic mixture (at a particular composition) shows negative deviation
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