Separation Processes Questions and Answers – Binary Azeotropic Mixtures

This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Binary Azeotropic Mixtures”.

1. What is the definition of azeotropic mixture?
a) A liquid mixture of two or more substances that boils at a constant characteristic temperature lower or higher than anyof its components and that retains the same composition in the vapor state as in the liquid state.
b) A liquid mixture of two or more substances that boils at a different characteristic temperature
c) A liquid mixture of two or more substances that boils at a constant characteristic pressure
d) A liquid mixture of two or more substances that boils at a constant characteristic temperature and pressure
View Answer

Answer: a
Explanation: A liquid mixture of two or more substances that boils at a constant characteristic temperature lower or higher than anyof its components and that retains the same composition in the vapor state as in the liquid state.

2. What is the value of K for azeotropic mixtures?
a) 0
b) 1
c) 2
d) 3
View Answer

Answer: b
Explanation: The vapor and liquid compositions are identical for azeotropic mixture; hence the K value is 1.

3. Isopropyl ether-isopropyl alcohol is which type of azeotropic mixture?
a) Minimum boiling heterogeneous mixture
b) Maximum boiling heterogeneous mixture
c) Minimum boiling homogeneous mixture
d) Minimum boiling heterogeneous mixture
View Answer

Answer: c
Explanation: Isopropyl ether-isopropyl alcohol is minimum boiling homogeneous mixture.
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4. Which of the following is true?
a) Heterogeneous mixtures are minimum boiling point mixture
b) Homogeneous mixtures are minimum boiling point mixture
c) Heterogeneous mixtures are maximum boiling point mixture
d) Homogeneous mixtures are maximum boiling point mixture
View Answer

Answer: a
Explanation: Heterogeneous mixtures are minimum boiling point mixtures because activity coefficients should be significantly greater than 1.

5. Which of the following is not true?
a) If more than one liquid phase exists,it is heterogenous azeotrope
b) A vapor can coexist with no more than two liquid phases
c) If the solution is layered then it is heterogeneous azeotrope
d) If one liquid phase exists it’s a homogeneous azeotrope
View Answer

Answer: c
Explanation: If the solution is layered then it is heterogeneous azeotrope is wrong and all other options are correct.
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6. Which of the following is most common azeotrope?
a) Minimum boiling heterogeneous
b) Maximum boiling heterogeneous
c) Maximum boiling homogeneous
d) Minimum boiling homogeneous
View Answer

Answer: d
Explanation: Minimum boiling homogeneous azeotropes are most common. E.g.:- isopropyl ether-isopropyl alcohol.

7. What happens when activity coefficients are greater than 1?
a) The maximum total pressure is smaller than vapor pressure of either component
b) The maximum total pressure is greater than vapor pressure of either components
c) The maximum total pressure is greater than one component only
d) The minimum total pressure is greater than vapor pressure of either components
View Answer

Answer: b
Explanation: The maximum total pressure is greater than vapor pressure of either component when the activity coefficients are greater than 1.
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8. Where are maximum boiling homogeneous azeotropes approached in distillation?
a) Bottom product
b) Top product
c) Vapors
d) Separate channel required
View Answer

Answer: a
Explanation: The maximum boiling homogeneous azeotropes approached in distillation at the bottom product.

9. How is it possible to shift the equilibrium to advantage in azeotropic mixture?
a) Changing the volume
b) Adding more mixture
c) Adding one of the component more
d) Changing the pressure.
View Answer

Answer: d
Explanation: By changing the pressure it is possible to shift the equilibrium and “break” the azeotrope.
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10. Which of the following could be an azeotropic mixture?
a) Components belonging to same functional group
b) Geometrical isomers
c) Functional isomers
d) Chain isomers
View Answer

Answer: c
Explanation: The functional isomers could have nearly same boiling points hence they could form an azeotropic mixture.

Sanfoundry Global Education & Learning Series – Separation Processes.

To practice all areas of Separation Processes, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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