GATE CH concept:activity-coefficients PYQs & Answers

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concept:activity-coefficients

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Questions 1–5 of 5. Imported answers require independent review unless marked reviewed.

Topic practice 5 questionsPage 1 of 1

Components

and

form an azeotrope. The saturation vapour pressures of

and

at the boiling point are 87 kPa and 72.7 kPa, respectively. The azeotrope composition is ____ mol%

(rounded off to the nearest integer).

GIVEN:

where

and

are the liquid phase mole fraction and activity coefficient of component

, respectively.

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The molar excess Gibbs free energy (

) of a liquid mixture of

and

is given by

where

and

are the mole fraction of

and

, respectively, the universal gas constant,

J K

mol

is the temperature in K, and

are temperature-dependent parameters. At 300 K,

and

. If

and

are the activity coefficients of

and

, respectively, the value of

at 300 K and 1 bar is __________ (rounded off to the nearest integer).

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A binary liquid mixture consists of two species 1 and 2. Let

and

represent the activity coefficient and the mole fraction of the species, respectively. Using a molar excess Gibbs free energy model,

vs.

and

vs.

are plotted. A tangent drawn to the

vs.

curve at a mole fraction of

has a slope = −1.728.

The slope of the tangent drawn to the

vs.

curve at the same mole fraction is ________ (correct to 3 decimal places).

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Mole fraction and activity coefficient of component 1 in a binary liquid mixture are

and

, respectively.

is excess molar Gibbs energy of the mixture,

is universal gas constant and

is absolute temperature of the mixture. Which one of the following is always true?

Your answerChoose one option.

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For a binary nonideal A-B mixture exhibiting a minimum boiling azeotrope, the activity coefficients,

(

), must satisfy

Your answerChoose one option.

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GATE CH concept:activity-coefficients PYQs

How to practice concept:activity-coefficients

Question 57

Question 48

Question 40

Question 19

Question 5