# Chemical Engineering Questions and Answers – Liquids and Gases in Equilibrium with Solids

This set of Chemical Engineering online test focuses on “Liquids and Gases in Equilibrium with Solids”.

1. What is the fraction of a gas in a system at partial pressure 1 mm Hg, if the 0.2 fraction of the same gas is at partial pressure 2 mm Hg and 0.3 fraction at partial pressure 3 mm Hg (Use Freundlich Isotherm)?
a) 0.1
b) 0.2
c) 0.3
d) 0.4

Explanation: y1/y2 = (p1/p2)n, => 0.2/0.3 = (2/3)n => n = 1, => 0.2 = k*21 = k = 0.1, => y = 0.1*11 = 0.1.

2. What is the fraction of a gas in a system at partial pressure 2 mm Hg, if the 0.2 fraction of the same gas is at partial pressure 8 mm Hg and 0.3 fraction at partial pressure 18 mm Hg (Use Freundlich Isotherm)?
a) 0.0125
b) 0.0250
c) 0.0375
d) 0.0450

Explanation: y1/y2 = (p1/p2)n, => 0.2/0.3 = (8/18)n => n = 2, => 0.2 = k*82 = k = 0.2/64, => y = 0.2/64*22 = 0.0125.

3. What is the fraction of a gas in a system at partial pressure 1 atm, if the 0.1 fraction of the same gas is at partial pressure 2 atm and 0.2 fraction at partial pressure 4 atm (Use Freundlich Isotherm)?
a) 0.01
b) 0.03
c) 0.05
d) 0.08

Explanation: y1/y2 = (p1/p2)n, => 0.1/0.2 = (2/4)n => n = 1, => 0.1 = k*21 = k = 0.1/2, => y = 0.1/2 = 0.05.

4. What is the fraction of a gas in a system at partial pressure 1 atm, if the 0.2 fraction of the same gas is at partial pressure 4 atm and 0.4 fraction at partial pressure 8 atm (Use Freundlich Isotherm)?
a) 0.1
b) 0.2
c) 0.4
d) 0.5

Explanation: y1/y2 = (p1/p2)n, => 0.2/0.4 = (4/8)n => n = 1, => 0.2 = k*41 = k = 0.2/4, => y = 0.2/4*1 = 0.05.

5. What is the fraction of a gas in a system at partial pressure 3 atm, if the 0.2 fraction of the same gas is at partial pressure 4 atm and 0.3 fraction at partial pressure 6 atm (Use Freundlich Isotherm)?
a) 0.1
b) 0.15
c) 0.2
d) 0.25

Explanation: y1/y2 = (p1/p2)n, => 0.2/0.3 = (4/6)n => n = 1, => 0.2 = k*41 = k = 0.2/4, => y = 0.2/4*31 = 0.15.
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6. Which of the following is called for the adsorbing the molecules?
c) Absobate
d) None of the mentioned

c) Absobate
d) None of the mentioned

8. Which of the following is called for the curves following isothermal adsorbtion?
d) Absorbent isotherm

9. Which of the following is the property of adsorbtion isotherm?
a) Linear
b) Decreasing
c) Monotonous
d) None of the mentioned

Explanation: Since the adsorbtion isotherms are always increasing they are monotonous.

10. Which of the following satisfies the first derivative of adsorbtion isotherms?
a) Greater than 1
b) Less than 1
c) Equal to 1
d) Cannot say

Explanation: Since adsorbtion isotherms are always increasing, so their first derivative are always increasing.

Sanfoundry Global Education & Learning Series – Basic Chemical Engineering.

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