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Chemical Engineering Thermodynamics MCQ Questions & Answers | Chemical Engineering

Learn Chemical Engineering Thermodynamics MCQ questions & answers are available for a Chemical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Chemical Engineering Thermodynamics MCQ question is the important chapter for a Chemical Engineering and GATE students. Page-4 section-2

Each section contains 100 MCQs on Chemical Engineering Thermodynamics .
31
The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.
Discuss
Answer & Solution
Answer: Option C
Solution:
Lavoisier and laplace law : the law states that the quantity of heat which must be supplied to decompose a compound in to its elemental form is equal to the amount of heat evolved during the formation compound from its element assuming no losses involved during both process.
32
Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.
Discuss
Answer & Solution
Answer: Option A
Solution:
Lavoisier and laplace law : the law states that the quantity of heat which must be supplied to decompose a compound in to its elemental form is equal to the amount of heat evolved during the formation compound from its element assuming no losses involved during both process.
33
In case of the decomposition of hydroiodic acid (2H$$I$$ ⇋ H2 + $${{I_2}}$$), addition of H2 (at equilibrium condition) will
Discuss
Answer & Solution
Answer: Option C
Solution:
Lechalters principle: Actually for an equilibrium reaction on increasing the reactant concentration the equilibrium shifts towards the right and therefore the reactants gets more dissociated and products concentration increases but here we are increasing the product $$\left( {{H_2}} \right)$$  concentration so the equilibrium shifts towards left and increases the formation of $$2HI$$  there by decreasing the dissociation of $$HI$$.
34
__________ does not change during phase transformation processes like sublimation, melting & vaporisation.
Discuss
Answer & Solution
Answer: Option B
Solution:
Since during phase change the temperature and pressure remains constant we can say the gibbs free energy remains constant and the relation is given by:
For single component and closed system : $$dG = VdP - SdT$$
35
Adiabatic compression of a saturated water vapour makes it
Discuss
Answer & Solution
Answer: Option B
Solution:
Adiabatic compression means no heat is allowed to transfer so $$\delta Q = 0$$   by first law we can say entire compression work done is used to raise the fluid internal temperature and hence if enough work is done the saturated water temperature raises and finally reaches the superheated state.
36
Standard temperature and pressure (S.T.P.) is
Discuss
Answer & Solution
Answer: Option A
Solution:
The S.T.P. conditions according to IUPAC is
Standard Pressure = 1 atm or 750 mm Hg
Standard temperature = 273.15 K or 0°C
37
In case of an __________ process, the temperature of the system increases.
Discuss
Answer & Solution
Answer: Option D
Solution:
During adiabatic compression the temperature of the gas increases because the work done on the system leads to increase in internal energy and there by increasing its temperature.
38
In a turbine, the fluid expands almost
Discuss
Answer & Solution
Answer: Option C
Solution:
In turbine the fluid is allowed to expand adiabatically to minimize the loss of mechanical energy in to surroundings in the form of heat so that the entire mechanical energy can be used effectively.
39
Specific/molar Gibbs free energy for a pure substance does not change during
Discuss
Answer & Solution
Answer: Option D
Solution:
During the phase change the gibbs free energy doesn’t change since the pressure and temperature are remained constant during phase change.
For single component and closed system : $$dG = VdP - SdT$$
40
1st law of thermodynamics is nothing but the law of conservation of
Discuss
Answer & Solution
Answer: Option C
Solution:
The first law of thermodynamics is an conservation of energy which states that energy cant be destroyed energy can be converted from one from to other but energy is not destroyed during the process and the energy of an isolated system always remans constant.
$$\delta Q = dU + \delta W$$