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1.Solution and Colligative properties
hard
A liquid mixture contain $10\ moles$ of $A$ $(P_A^0= 200\ mm\ Hg)$ and $10\ moles$ of $B$ $( P_B^0 = 100\ mm\ Hg )$. The vapour pressure over liquid mixture is $160\ mm\ Hg$. Which is correct statement ?
A
$\Delta {G_{mix}} = + \,ve$
B
$\Delta {V_{mix}} = -\,ve$
C
$\Delta {S_{surrounding}} = +\,ve$
D
None of these
Solution
$\mathrm{P}_{\text {solution }}=160$
$\mathrm{P}_{\text {total }}=200 \times 0.5+100 \times 0.5=150$
Solution have positive deviation from Raoult's law.
$\Delta \mathrm{G}_{\operatorname{mix}}<0$ $\Delta\mathrm{V}_{\operatorname{mix}}>0$ $\Delta\mathrm{H}_{\operatorname{mix}}>0$
$\Delta \mathrm{S}_{\mathrm{surr}}<0$
Standard 12
Chemistry
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