3901. Entropy change for an irreversible process taking system and surrounding together is
A. 0
B. > 0
C. < 0
D. None of these
✅ The correct answer is option B.
Chemical Engineering
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3902. CaH₄(PO₄)₂ is the chemical formula of
Superphosphate
Triple superphosphate
Calcium phosphate
Meta phosphoric acid
✅ The correct answer is option B.
3903. Triple superphosphate is chemically represented as
CaF₂.3Ca₃(PO₄)₂
3Ca₃(PO₄)₂
Ca(PO₃)₂
Ca(H₂PO₄)₂
✅ The correct answer is option A.
3904. PVy = constant, holds good for an isentropic process, which is
A. Reversible and isothermal
B. Isothermal and irreversible
C. Reversible and adiabatic
D. Adiabatic and irreversible
✅ The correct answer is option C.
3905. The third law of thermodynamics states that the
A. Heat capacity of a crystalline solid is zero at absolute zero temperature
B. Heat transfer from low temperature to high temperature source is not possible without external work
C. Gases having same reduced properties behave similarly
D. None of these
✅ The correct answer is option A.
3906. For a spontaneous process, free energy
A. Is zero
B. Increases
C. Decreases whereas the entropy increases
D. And entropy both decrease
✅ The correct answer is option C.
3907. Isobaric process means a constant process.
A. Temperature
B. Pressure
C. Volume
D. Entropy
✅ The correct answer is option B.
3908. Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis?
H? separation from coke oven gas
Steam reforming of naphtha
Cracking of natural gas
Electrolysis of water
✅ The correct answer is option D.
3909. Color of nitric acid is light yellow due to the presence of
NO
NO₂
N₂H₅
NH₃
✅ The correct answer is option B.
3910. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is
A. Less
B. More
C. Same
D. Dependent on climatic conditions
✅ The correct answer is option A.