tricky Chemical Process Calculation questions and answers focuses on “Phase diagrms and phase rule-III”.
1. Phase rule is concerned only with the __________ properties of the system.
a) Intensive
b) Extensive
c) Both intensive and extensive
d) Neither intensive nor extensive
Answer: a
Clarification: Phase rule is concerned only with the Intensive properties of the system.
2. Properties that do not depend on the quantity of material present, are called
a) Intensive properties
b) Extensive properties
c) Variable properties
d) None of the mentioned
Answer: a
Clarification: Properties that do not depend on the quantity of material present are called intensive properties.
3. _________ variable does depend on how much material you have.
a) Intensive
b) Extensive
c) Both intensive and extensive
d) Neither intensive nor extensive
Answer: b
Clarification: Extensive variable does depend on how much material you have.
4. Gibbs phase rule can be applied to the systems which are in
a) Saturation
b) Equilibrium
c) Critical state
d) Supercritical state
Answer: b
Clarification: Gibbs phase rule can be applied to the systems which are in equilibrium.
5. Gibbs phase rule is, when no chemical reaction occurs
a) F – C + P = 2
b) F + C – P = 2
c) F + C + P = 2
d) F – C – P = 2
Where: F: Degree of freedom, C: Number of independent component, P: Number of phases that can exist in the system
Answer: a
Clarification: Gibbs phase rule: F – C + P = 2.
6. For a pure gas, the values of F, C, and P are
Where: F: Degree of freedom, C: Number of independent component, P: Number of phases that can exist in the system
a) 2, 2, 2
b) 2, 2, 1
c) 2, 1, 1
d) 1, 1, 1
Answer: c
Clarification: F – C + P = 2, for Pure gas, number of phases = 1, and component = 1, then F = 2.
7. A ________ system is one in which no variation of conditions is possible without one phase disappearing.
a) Variant
b) Invariant
c) Constant
d) None of the mentioned
Answer: b
Clarification: A invariant system is one in which no variation of conditions is possible without one phase disappearing.
8. What is the degree of freedom for a mixture of ice and vapour?
a) 1
b) 2
c) 3
d) 4
Answer: 1
Clarification: F = 2 – 2 + 1 = 1.
9. What is the degree of freedom for pure liquid Benzene?
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: F = 2 – 1 + 1 = 2.
10. The number of independent properties that have to be specified to determine all the intensive properties of each phase of the system of interest is the number of degrees of freedom.
The above given statement is
a) True
b) False
c) Depends on a system`s properties
d) None of the mentioned
Answer: a
Clarification: The number of independent properties that have to be specified to determine all the intensive properties of each phase of the system of interest is the number of degrees of freedom.
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