InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the total pressure of a system having 50% H2CO3 with 6 atm partial pressure and 50% O2 with 12 atm partial pressure?(a) 3 atm(b) 6 atm(c) 9 atm(d) 12 atmI got this question during an interview.My doubt stems from Vapor-Liquid Equilibria in Binary Systems topic in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT answer is (C) 9 atm The best explanation: P = 0.5*6 + 0.5*12 = 9 atm. |
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| 2. |
What is the total pressure of a system having 25% CO2 with 4 atm partial pressure and 30% O2 with 10 atm partial pressure, and 45% SO2 with partial pressure 20 atm?(a) 9 atm(b) 13 atm(c) 17 atm(d) 19 atmThe question was asked by my college director while I was bunking the class.My question is taken from Vapor-Liquid Equilibria in Binary Systems in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT ANSWER is (b) 13 atm The explanation is: P = 0.25*4 + 0.3*10 + 0.45*20 = 1 + 3 + 9 = 13 atm. |
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| 3. |
What is the K value of a gas with partial pressure 50 Pa and the total pressure of the system is 1 mm Hg?(a) 0.37(b) 0.45(c) 0.79(d) 0.91This question was posed to me in unit test.The question is from Vapor-Liquid Equilibria in Binary Systems in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT OPTION is (a) 0.37 Explanation: K = 50/133.3 = 0.37. |
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| 4. |
What is the total pressure of a system having 40% O2 with 5 atm partial pressure and 60% N2 with 10 atm partial pressure?(a) 2 atm(b) 6 atm(c) 8 atm(d) 10 atmI had been asked this question in a national level competition.Enquiry is from Vapor-Liquid Equilibria in Binary Systems in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT choice is (c) 8 atm |
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| 5. |
A 40% gas in a system has partial pressure 4 atm, what is Henry’s constant?(a) 1.6 atm(b) 4 atm(c) 10 atm(d) 16 atmThe question was asked during an online exam.Question is from Vapor-Liquid Equilibria in Binary Systems topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT CHOICE is (C) 10 ATM |
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| 6. |
What is the K value of a gas with partial pressure 10 atm and the total pressure of the system is 50 atm?(a) 0.1(b) 0.2(c) 100(d) 500I had been asked this question during an interview for a job.My question comes from Vapor-Liquid Equilibria in Binary Systems in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT ANSWER is (B) 0.2 |
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| 7. |
What is the partial pressure of a 70% gas in a system, if H = 5 mm Hg?(a) 3.5 mm Hg(b) 7 mm Hg(c) 14 mm Hg(d) 35 mm HgThe question was asked in a national level competition.Asked question is from Vapor-Liquid Equilibria in Binary Systems topic in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT OPTION is (a) 3.5 mm Hg Explanation: Partial PRESSURE = 0.7*5 = 3.5 mm Hg. |
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| 8. |
What is the fraction of a gas in a system with partial pressure 10 mm Hg, H = 25 mm Hg?(a) 0.1(b) 0.2(c) 0.3(d) 0.4The question was asked in my homework.My enquiry is from Vapor-Liquid Equilibria in Binary Systems in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT ANSWER is (d) 0.4 Easiest EXPLANATION: FRACTION of a GAS = 10/25 = 0.4. |
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| 9. |
What is the partial pressure of a 10% gas in a system, if H = 2 mm Hg?(a) 0.1 mm Hg(b) 0.2 mm Hg(c) 0.3 mm Hg(d) 0.4 mm HgThis question was addressed to me during an online exam.Question is from Vapor-Liquid Equilibria in Binary Systems in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The correct answer is (b) 0.2 MM Hg |
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| 10. |
According to Henry’s Law, what is the fraction of a gas with partial pressure p and Henry’s constant H?(a) p*H(b) p/H(c) p + H(d) p – HThis question was addressed to me by my school principal while I was bunking the class.My doubt is from Vapor-Liquid Equilibria in Binary Systems topic in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT option is (B) P/H |
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| 11. |
What is the vapor pressure of 40% gas in a system with partial pressure 20 mm Hg?(a) 5 mm Hg(b) 10 mm Hg(c) 20 mm Hg(d) 50 mm HgThis question was addressed to me during a job interview.Question is from Vapor-Liquid Equilibria in Binary Systems topic in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT CHOICE is (d) 50 mm Hg For EXPLANATION I would SAY: Vapor pressure = 20/0.4 = 50 mm Hg. |
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| 12. |
What is the partial pressure of 20% gas in a system with vapor pressure 10 mm Hg?(a) 2 mm Hg(b) 10 mm Hg(c) 50 mm Hg(d) 100 mm HgThis question was posed to me in an international level competition.Question is from Vapor-Liquid Equilibria in Binary Systems topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT ANSWER is (a) 2 MM HG Easiest EXPLANATION: Partial pressure = 0.2*10 = 2 mm Hg. |
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| 13. |
What is the fraction of gas in a system with partial pressure 2 mm Hg and vapor pressure 5 mm Hg?(a) 0.4(b) 0.5(c) 0.6(d) 0.8I had been asked this question in an internship interview.Question is from Vapor-Liquid Equilibria in Binary Systems in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The correct choice is (a) 0.4 |
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| 14. |
What is the vapor pressure of 50% gas in a system with partial pressure 2 mm Hg?(a) 1 mm Hg(b) 2 mm Hg(c) 4 mm Hg(d) 8 mm HgThis question was posed to me in class test.Query is from Vapor-Liquid Equilibria in Binary Systems topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The correct ANSWER is (C) 4 MM Hg |
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| 15. |
What is the partial pressure of a 40% gas in a system with vapor pressure 1 mm Hg?(a) 0.2 mm Hg(b) 0.4 mm Hg(c) 0.6 mm Hg(d) 0.8 mm HgI had been asked this question by my college professor while I was bunking the class.The question is from Vapor-Liquid Equilibria in Binary Systems in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT choice is (B) 0.4 MM HG The explanation: P = 0.4*1 = 0.4 mm Hg. |
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| 16. |
What is the degree of freedom of a gaseous mixture composed of CH4, CO2, H2CO3, H2O and H2O2?(a) 1(b) 2(c) 3(d) 4This question was addressed to me in unit test.I need to ask this question from Gibbs Phase Rule in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT OPTION is (d) 4 Easiest explanation: F = 2 – 1 + 3 = 4. |
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| 17. |
What is the degree of freedom of a mixture composed of liquid O2, gaseous H2 and ice?(a) 1(b) 2(c) 3(d) 4I had been asked this question in an interview.This interesting question is from Gibbs Phase Rule in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT CHOICE is (a) 1 Explanation: F = 2 – 3 + 2 = 1. |
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| 18. |
What is the degree of freedom of a mixture composed Liquid H2O, solid Br2 and gaseous CO2, NO2?(a) 1(b) 2(c) 3(d) 4I got this question during an interview for a job.My doubt is from Gibbs Phase Rule in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT choice is (C) 3 Easiest EXPLANATION: F = 2 – 3 + 4 = 3. |
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| 19. |
What is the degree of freedom of a gas mixture composed of O2, H2O and H2O2?(a) 1(b) 2(c) 3(d) 4I have been asked this question in a job interview.I'd like to ask this question from Gibbs Phase Rule topic in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Correct CHOICE is (c) 3 |
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| 20. |
What is the degree of freedom of a gas mixture composed of CO2, SO2, SO3, CH4, H2CO3?(a) 2(b) 3(c) 5(d) 7This question was posed to me during an interview for a job.I would like to ask this question from Gibbs Phase Rule topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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| 21. |
What is the degrees of freedom of a system with a mixture of copper pyrites, liquid benzene and helium?(a) 1(b) 2(c) 3(d) 4I got this question during an interview.This interesting question is from Gibbs Phase Rule in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT OPTION is (B) 2 |
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| 22. |
What is the degrees of freedom of a system with a mixture of ice, water and neon?(a) 1(b) 2(c) 3(d) 4The question was posed to me in homework.Origin of the question is Gibbs Phase Rule in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT OPTION is (c) 3 Explanation: F = 2 – 3 + 2 = 3. |
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| 23. |
What is the degrees of freedom of a system with a mixture of water, liquid benzene and oxygen?(a) 1(b) 2(c) 3(d) 4The question was asked during an interview.Enquiry is from Gibbs Phase Rule in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT ANSWER is (c) 3 To ELABORATE: F = 2 – 2 + 3 = 3. |
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| 24. |
What is the degrees of freedom of a system with a mixture of water and ice?(a) 1(b) 2(c) 3(d) 4This question was posed to me in examination.This intriguing question originated from Gibbs Phase Rule in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Correct OPTION is (a) 1 |
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| 25. |
What is the degrees of freedom of a system with pure water?(a) 2(b) 4(c) 5(d) 7I got this question in an internship interview.Origin of the question is Gibbs Phase Rule in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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| 26. |
What is the degrees of freedom of a system with 5 phases and 5 components?(a) 1(b) 2(c) 3(d) 4This question was posed to me in an online interview.Query is from Gibbs Phase Rule in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT option is (b) 2 |
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| 27. |
What is the degree of freedom of a system with 3 phases and 5 components?(a) 1(b) 2(c) 3(d) 4This question was addressed to me during an online exam.Question is taken from Gibbs Phase Rule in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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| 28. |
What is the number of components in a system with 3 degrees of freedom and 2 phases?(a) 1(b) 2(c) 3(d) 4This question was posed to me during an internship interview.The question is from Gibbs Phase Rule in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT CHOICE is (C) 3 Explanation: C = 2 – 2 + 3 = 3. |
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| 29. |
What is the number of phases in a system with 2 degrees of freedom and 2 components?(a) 1(b) 2(c) 3(d) 4This question was posed to me during an interview for a job.My question is based upon Gibbs Phase Rule topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right ANSWER is (B) 2 |
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| 30. |
1.5 mole glucose reacts completely with excess air, if 5 liter of bone dry air is produced at 27^oC and 30 atm, what is the humidity?(a) 50%(b) 150%(c) 200%(d) 300%I had been asked this question in exam.I need to ask this question from Material Balance Problems Involving Partial Saturation topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Correct option is (B) 150% |
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| 31. |
What is the degree of freedom of a system with 2 phases and 1 component?(a) 1(b) 2(c) 3(d) 4The question was posed to me during a job interview.This intriguing question originated from Gibbs Phase Rule in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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| 32. |
10 mole glucose reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 30 atm, what is the humidity?(a) 100%(b) 200%(c) 300%(d) 400%I had been asked this question in final exam.This is a very interesting question from Material Balance Problems Involving Partial Saturation topic in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right choice is (b) 200% |
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| 33. |
6 mole glucose reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 20 atm, what is the humidity?(a) 20%(b) 80%(c) 145%(d) 180%I have been asked this question in examination.Asked question is from Material Balance Problems Involving Partial Saturation topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right ANSWER is (d) 180% |
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| 34. |
1 mole glucose reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 40%(b) 80%(c) 120%(d) 160%The question was posed to me during an interview.I would like to ask this question from Material Balance Problems Involving Partial Saturation topic in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT option is (c) 120% |
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| 35. |
0.2 mole glucose reacts completely with excess air, if 5 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 40%(b) 80%(c) 120%(d) 160%I have been asked this question in an internship interview.This is a very interesting question from Material Balance Problems Involving Partial Saturation in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT choice is (C) 120% Easiest explanation: MOLES of bone dry air = 1, moles of H2O produced = 1.2, => humidity = 1.2/1*100 = 120%. |
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| 36. |
25 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 10%(b) 100%(c) 500%(d) 1000%The question was posed to me during an internship interview.This interesting question is from Material Balance Problems Involving Partial Saturation topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right choice is (d) 1000% |
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| 37. |
50 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 25 atm, what is the humidity?(a) 20%(b) 80%(c) 200%(d) 400%The question was posed to me in unit test.I want to ask this question from Material Balance Problems Involving Partial Saturation in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Correct choice is (d) 400% |
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| 38. |
0.1 mole of CH4 reacts completely with excess air, if 1 liter of bone dry air is produced at 27^oC and 25 atm, what is the humidity?(a) 4%(b) 15%(c) 20%(d) 52%The question was asked in exam.My question is from Material Balance Problems Involving Partial Saturation topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT choice is (c) 20% The EXPLANATION: Moles of bone dry air = 1, moles of H2O produced = 0.2, => humidity = 0.2/1*100 = 20%. |
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| 39. |
2 mole of CH4 reacts completely with excess air, if 25 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 45%(b) 80%(c) 95%(d) 143%This question was addressed to me in semester exam.Origin of the question is Material Balance Problems Involving Partial Saturation in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Correct CHOICE is (b) 80% |
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| 40. |
1 mole of CH4 reacts completely with excess air, if 5 liter of bone dry air is produced at 27^oC and 5 atm, what is the humidity?(a) 25%(b) 50%(c) 100%(d) 200%This question was addressed to me in quiz.Question is taken from Material Balance Problems Involving Partial Saturation topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right choice is (d) 200% |
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| 41. |
A reaction has produced 45 moles of water and 25 liter of bone dry air at 27^oC and 25 atm, what is the humidity?(a) 25%(b) 104%(c) 180%(d) 209%I had been asked this question during an interview.My query is from Material Balance Problems Involving Partial Saturation topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT choice is (c) 180% EASY explanation: MOLES of bone DRY air = 25, => HUMIDITY = 45/25*100 = 180%. |
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| 42. |
A reaction has produced 5 moles of water vapor and 10 liter bone dry air at 27^oC and 15 atm, what is the humidity?(a) 24%(b) 49%(c) 83%(d) 106%The question was asked in an online quiz.Asked question is from Material Balance Problems Involving Partial Saturation in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» RIGHT answer is (c) 83% For explanation I WOULD say: Moles of bone dry air = 6, => HUMIDITY = 5/6*100 = 83%. |
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| 43. |
A reaction has produced 1.5 moles of water and 2 liter of bone dry air at 27^oC and 25 atm, what is the humidity?(a) 5%(b) 25%(c) 50%(d) 75%The question was posed to me during an interview.I would like to ask this question from Material Balance Problems Involving Partial Saturation in portion Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Correct answer is (d) 75% |
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| 44. |
A reaction has produced 0.4 mole of water vapor and 1 liter of bone dry air at 27oC and 5 atm, what is the humidity?(a) 85%(b) 143%(c) 178%(d) 200%This question was posed to me during an interview.I want to ask this question from Material Balance Problems Involving Partial Saturation topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right option is (d) 200% |
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| 45. |
A reaction has produced 1 mole of water vapor and 5 liter of bone dry air at 27^oC and 5 atm, what is the humidity?(a) 100%(b) 104%(c) 115%(d) 169%This question was posed to me by my school principal while I was bunking the class.My question comes from Material Balance Problems Involving Partial Saturation topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right OPTION is (a) 100% |
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| 46. |
What are moles of dry gas if the moles of water vapor is 14 at 25% humidity?(a) 3.5(b) 7(c) 14(d) 56This question was posed to me during an interview.Asked question is from Partial Saturation Terminology topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Right CHOICE is (d) 56 |
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| 47. |
What is the humidity if the moles of dry gas is 25 and mole of water vapor are 15?(a) 60%(b) 90%(c) 150%(d) 200%This question was posed to me in class test.The above asked question is from Partial Saturation Terminology topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» CORRECT ANSWER is (a) 60% Explanation: HUMIDITY = 15/25*100 = 60%. |
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| 48. |
What is the mass of water vapor, if the mass of dry gas is 10 lb and humidity 10%?(a) 254 g(b) 453 g(c) 746 g(d) 1 KgThis question was addressed to me during an internship interview.My question is from Partial Saturation Terminology in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The correct choice is (B) 453 g |
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| 49. |
What is the humidity, if the mass of dry gas is 10 Kg and mass of water vapor is 5 Kg?(a) 25%(b) 50%(c) 100%(d) 200%I had been asked this question in quiz.This interesting question is from Partial Saturation Terminology topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» Correct answer is (b) 50% |
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| 50. |
What is the molal humidity of a gas with partial pressure with vapor 1 mm Hg and partial pressure without vapor 1 atm?(a) 90%(b) 131%(c) 214%(d) 288%This question was posed to me in an online quiz.Question is taken from Partial Saturation Terminology topic in section Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering |
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Answer» The CORRECT choice is (B) 131% |
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