This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Differential Distillation”.

1. In differential distillation, there is no ____________

a) Distillate

b) Reaction

c) Reflux

d) Vapors

View Answer

Explanation: In differential distillation, there is no reflux.

2. What is the condition for Yd and x_{d} for toatal condensation?

a) Yd greater than x_{d}

b) Yd smaller than x_{d}

c) Yd smaller than or equal to x_{d}

d) Yd equal to x_{d}

View Answer

Explanation: For total condensation Y

_{d}=X

_{d}.

3. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W_{0}= 1000

Moles of liquid in residue at end W= 500

Mole fraction in liquid at start X_{0} = 0.6

Mole fraction in liquid at end X= 0.5

a) 0.2

b) 0.3

c) 0.4

d) 0.5

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 0.2.

4. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W_{0}= 800

Moles of liquid in residue at end W= 500

Mole fraction in liquid at start X_{0} = 0.5

Mole fraction in liquid at end X= 0.1

a) 0.2

b) 0.3

c) 1

d) 0.5

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 1.

5. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W_{0}= 2000

Moles of liquid in residue at end W= 500

Mole fraction in liquid at start X_{0} = 0.3

Mole fraction in liquid at end X= 0.4

a) 0.23

b) 0.34

c) 0.27

d) 0.56

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 0.27.

6. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W0= 1000

Moles of liquid in residue at end W= 500

Mole fraction in liquid at start X0 = 0.5

Mole fraction in liquid at end X= 0.2

a) 0.2

b) 0.66

c) 0.4

d) 0.8

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 0.8.

7. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W_{0}= 1000

Moles of liquid in residue at end W= 500

Mole fraction in liquid at start X_{0} = 0.25

Mole fraction in liquid at end X= 0.1

a) 0.2

b) 0.3

c) 0.4

d) 0.5

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 0.4.

8. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W_{0}= 1000

Moles of liquid in residue at end W= 600

Mole fraction in liquid at start X_{0} = 0.6

Mole fraction in liquid at end X= 0.5

a) 0.2

b) 0.67

c) 0.44

d) 0.75

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 0.75.

9. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W_{0}= 1000

Moles of liquid in residue at end W= 500

Mole fraction in liquid at start X_{0} = 0.7

Mole fraction in liquid at end X= 0.4

a) 0.2

b) 1

c) 0.4

d) 0.5

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 1.

10. What is the mole fraction in instantaneous distillate if:

Moles of liquid in residue at start W_{0}= 1000

Moles of liquid in residue at end W= 300

Mole fraction in liquid at start X_{0} = 0.6

Mole fraction in liquid at end X= 0.5

a) 0.26

b) 0.61

c) 0.64

d) 0.59

View Answer

Explanation: X

_{D}= W

_{0}X

_{0}–WX/W

_{0}-X, hence X

_{d}= 0.64.

**Sanfoundry Global Education & Learning Series – Separation Processes.**

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