Q.1
If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law.
Q.2
If atmospheric temperature and dew point are nearly equal, then the relative humidity is
Q.3
The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by
Q.4
The minimum number of phases that can exist in a system is
Q.5
Extensive properties of a thermodynamic system depend upon the __________ of the system.
Q.6
What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?
Q.7
The first law of thermodynamics is a restatement of the law of conservation of
Q.8
For a constant volume process __________ by the system is used only to increase the internal energy.
Q.9
Degree of freedom of a system consisting of a gaseous mixture of H₂ and NH₃ will be
Q.10
A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
Q.11
A system in which there is exchange of energy but not of mass, is called a/an __________ system.
Q.12
First law of thermodynamics deals with the
Q.13
Which of the following is not an equation of state?
Q.14
Entropy of the system decreases, when
Q.15
The second law of thermodynamics states that
Q.16
Which of the following is not a common refrigerant?
Q.17
Which of the following is not a reversible process ?
Q.18
A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system
Q.19
The expression for entropy change given by, ΔS = - nR ln (P₂/P₁), holds good for
Q.20
If we increase the pressure on a substance (which is at its triple point), then the triple point
Q.21
A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P₁ and P₂.(where, P₁ and P₂ are initial and final pressures respectively)
Q.22
Helmholtz free energy (A) is defined as
Q.23
For spontaneous changes in an isolated system (S = entropy)
Q.24
A gas performs the maximum work, when it expands
Q.25
Partial molal quantities are important in the study of
Q.26
For organic compounds, group contribution method can be used for the estimation of
Q.27
In a P-V diagram (for an ideal gas), an isothermal curve will coincide withan adiabatic curve (through a point), when
Q.28
The shape of T-S diagram for Carnot Cycle is a
Q.29
For any system, what is the minimum number of degrees of freedom?
Q.30
Fugacity is a measure of the
Q.31
Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)
Q.32
Gibbs free energy (F) is defined as
Q.33
A system is said to be at equilibrium, if the entropy of the system has reached __________ value.
Q.34
Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.
Q.35
At the critical point of a substance
Q.36
With increase in compression ratio, the efficiency of the otto engine
Q.37
__________ functions are exemplified by heat and work.
Q.38
Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is
Q.39
Which of the following has the minimum value of COP for a given refrigeration effect?
Q.40
Sublimation temperature of dry ice (solid CO₂) is __________ °C.
Q.41
The equation relating E, P, V and T which is true for all substanes under all conditions is given by (∂E/∂V)T = T.(∂P/∂T)H - P . This equation is called the
Q.42
In the reaction, C + O₂ → CO₂ ; ΔH = - 94 kcal. What is the heat content (enthalpy)of O₂?
Q.43
Standard temperature and pressure (S.T.P.) is
Q.44
In case of an __________ process, the temperature of the system increases.
Q.45
What is the degree of freedom for a system comprising liquid water equilibrium with its vapour?
Q.46
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is
Q.47
Which of the following processes can not be made reversible even under ideal condition of operation?
Q.48
No work is done by the system, when a reaction occurs at constant
Q.49
In the reaction, H₂ +I₂ ⇋ 2HI, addition of an inert gas will
Q.50
Henry's law is closely obeyed by a gas, when its __________ is extremely high.
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