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Login5 moles of liquid X and 10 moles of liquid Y make a solution having a total vapour pressure 70 torr. The vapour pressures of pure X and pure Y are 64 torr and 76 torr respectively. Which of the following is true regarding the described solution?
(a) The solution shows positive deviation
(b) The solution shows negative deviation
(c) The solution is ideal
(d) The solution has volume greater than the sum of individual volumes
I have been asked this question during a job interview.
The query is from Ideal and Non-Ideal Solutions topic in portion Solutions of Chemistry – Class 12
Chemistry – Class 12 Solutions in Chemistry – Class 12 . 3 years ago
+10 pts
Correct choice is (b) The SOLUTION shows negative deviation
Explanation: Given,
Observed pressure = 76 torr
According to Raoult’s law,
pA = xA x pA^0 = 5/15 x 64 = 21.33 torr
pB = XB x pB^0 = 10/15 x 76 = 50.67 torr
Therefore, pressure EXPECTED by Raoult’s law = 21.33 + 50.67 = 72 torr.
Thus, observed pressure (70 torr) is LESS than the expected value. Hence, the solution shows negative deviation.
Posted on 02 Dec 2021, this text provides information on Chemistry – Class 12 related to Solutions in Chemistry – Class 12. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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