Chemical Process Calculation Questions and Answers – Saturation

This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Saturation”.

1. Antoine equation is a relation between
a) Vapour pressure and partial pressure
b) Vapour pressure and Temperature
c) Vapour pressure and absolute pressure
d) None of the mentioned
View Answer

Answer: b
Explanation: Antoine equation is a relation between Vapour pressure and Temperature.

2. Correct representation of the Antoine equation is
a) ln(p*) = A-B/(C+T)
b) log(p*) = A-B/(C-T)
c) ln(p*) = A+B/(C+T)
d) log(p*) = A-B/(C+T)
Where: p* & T are Vapour pressure and Temperature respectively and A, B & C are constants.
View Answer

Answer: b
Explanation: ln(p*) = A-B/(C+T) is the correct representation of Antoine equation.

3. The temperature at which the vapour just start to condense at a specified pressure is
a) Critical temperature
b) Boiling point
c) Dew point
d) Triple point
View Answer

Answer: c
Explanation: The temperature at which the vapour just start to condense at a specified pressure is Dew point.
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4. At dew point the partial pressure of the is equal to the partial pressure of the volatile liquid.
The above given statements is
a) Always correct
b) Incorrect
c) Depends on the properties of the liquid
d) None of the mentioned
View Answer

Answer: b
Explanation: At dew point the partial pressure of the is equal to the vapour pressure of the volatile liquid.

5-7. Assume water in air at 600 mm of Hg at 51 Degree Celsius. (Vapour pressure = 98 mm Hg)
5. What is the pressure of Air?
a) 502 mm Hg
b) 402 mm Hg
c) 302 mm Hg
d) 202 mm Hg
View Answer

Answer: a
Explanation: Pair = Ptotal – p*.
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6. What is the composition of vapour?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367
View Answer

Answer: a
Explanation: yH2O = 98/600.

7. What is the composition of vapour?
a) 0.163
b) 0.183
c) 0.2837
d) 0.8367
View Answer

Answer: d
Explanation: yAir = 502/600.
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8. Dew point of water at standard conditions is?
a) 100 K
b) 273 K
c) 373 K
d) 473 K
View Answer

Answer: c
Explanation: Dew point of water at standard condition = 100 Degree Celsius.

9-10. Water vapour of 5 KPa at 300 K is saturated with air in a system.
9. What is the mole fraction of air?
a) 0.952
b) 0852
c) 0.259
d) 0.291
View Answer

Answer: a
Explanation: Mole fraction of air = 101.3/(5 + 101.3) = 0.952.
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10. What is the mole fraction of vapour?
a) 0.047
b) 0.057
c) 0.067
d) 0.077
View Answer

Answer: a
Explanation: Mole fraction of air = 5/(5 + 101.3) = 0.047.

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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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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