Chemical Engineering

Liquids and Gases in Equilibrium with Solids

Question 1
Marks : +2 | -2
Pass Ratio : 100%
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)?
0.1
0.15
0.2
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.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
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)?
0.01
0.03
0.05
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.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
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)?
0.1
0.2
0.4
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.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the following satisfies the first derivative of adsorbtion isotherms?
Greater than 1
Less than 1
Equal to 1
Cannot say
Explanation:
Since adsorbtion isotherms are always increasing, so their first derivative are always increasing.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is the property of adsorbtion isotherm?
Linear
Decreasing
Monotonous
None of the mentioned
Explanation:
Since the adsorbtion isotherms are always increasing they are monotonous.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
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)?
0.0125
0.0250
0.0375
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.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following adsorbs on the adsorbing surface?
Adsorbate
Adsorbent
Absobate
None of the mentioned
Explanation:
Adsorbate adsorbs on the adsorbent.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is called for the adsorbing the molecules?
Adsorbate
Adsorbent
Absobate
None of the mentioned
Explanation:
The one which adsorbs the molecules is called the adsorbent.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
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)?
0.1
0.2
0.3
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.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is called for the curves following isothermal adsorbtion?
Adsorbtion isotherm
Adsorbate isotherm
Adsorbent isotherm
Absorbent isotherm
Explanation:
The curves for isothermal adsorbtion are called adsorbtion isotherms.