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CBSE Class 12-science Answered

(ctrl/Cmd+V)Octane and nonane forms nearly ideal binary solution. When 1.0 mL of octane is added to 100 mL of nonane, the boiling point of solution falls. Which of the following is true about octane and nonane at same temperature? (1) Pure octane has lower vapour pressure than pure nonane. (2) Pure nonane has lower vapour pressure than pure octane. (3) The solution formed above has lower vapour pressure than both pure octane and pure nonane. (4) The solution formed above has greater vapour pressure than both pure octane and pure nonane.
Asked by vidyavikram10 | 01 Sep, 2020, 04:18: PM
answered-by-expert Expert Answer
Given mixture is an ideal solution.
According to Henry's law-
P equals P subscript A superscript o space X subscript A space plus space P subscript B superscript o space end superscript space X subscript B

W h e r e space P subscript A superscript o space a n d space P subscript B superscript o space end superscript space a r e space t h e space p r e s s u r e space o f space h y d r o c a r b o n s space a t space p u r e space s t a t e.
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W h e r e space P subscript A superscript o space a n d space P subscript B superscript o space end superscript space a r e space t h e space p r e s s u r e space o f space h y d r o c a r b o n s space a t space p u r e space s t a t e.
a n d space v a l u e space o f space X subscript A space end subscript space a n d space X subscript B space w i l l space b e space l e s s space t h a n space o n e.

S o comma space t h e space s o l u t i o n space f o r m e d space a b o v e space w i l l space h a v e space l e s s space v a s p o u r space p r e s s u r e
Answered by Ravi | 04 Sep, 2020, 10:16: AM
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