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The energy of activation of exothermic reaction is
negative.
Zero.
very large compared to that for en-dothermic reaction.
not possible to predict.
Which of the following has the minimum value of COP for a given refrigeration effect
Vapour-compression process with a reversible expansion engine.
Reverse Carnot cycle.
Air refrigeration cycle.
Ordinary vapour-compression cycle.
For an ideal gas, the activity co-efficient is
unity at all pressures.
None of these.
directly proportional to pressure.
inversely proportional to pressure.
Which of the following is true for Virial equation of state
Virial co-efficients 'B' represents three body interactions.
For some gases, Virial equations and ideal gas equations are the same.
Virial co-efficients are universal constants.
Virial co-efficients are function of temperature only.
For an ideal gas, the internal energy depends upon its __________ only
Volume
Temperature
Pressure
molecular size
Rotary lime kiln is an example of a/an __________ system
open
non-thermodynamic
isolated
Closed
With increase in pressure
(above atmospheric pressure), the Cp of a gas
Increases
Remains unchanged
First decreases and then increases
Decreases
The expression for entropy change, ΔS = n Cp
. ln (T2/T1), is valid for the __________ of a substance
heating
both (b) and (c)
simultaneous pressure & temperature change
Cooling
Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a
hyperbola
parabola
sine curve
Straight line
Consider the process A & B shown in the figure given below In this case, it is possilbe that
both the processes are isothermal.
process A is adiabatic while B is isothermal.
both the processes are adiabatic.
process A is isothermal while B is adiabatic.
The Carnot co-efficient of performance
(COP) of a domestic air conditioner compared to a household refrigerator is
less
more
Same
dependent on climatic conditions
Which of the following is not a common refrigerant
Freon-12
Carbon dioxide
Ammonia
Ethylene
The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for
simultaneous heating and expansion of an ideal gas.
reversible isothermal volume change.
cooling of a substance.
heating of a substance.
In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible __________ process
Isometric
Isobaric
Isothermal
isentropic
The gas law (PV = RT) is true for an __________ change
Adiabatic
Neither (A) Nor (B)
Isothermal
Both (a) & (b)
In a homogeneous solution, the activity co-efficient of a component depends upon the
Temperature
Pressure
All (A), (B) and (C)
Composition
Domestic refrigerator usually works on the __________ refrigeration cycle
Carnot
Air
vapour-ejection
absorption
For an isothermal reversible compression of an ideal gas
ΔE = ΔH = 0
only ΔE = 0
dQ = dE
only ΔH =0
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
fusion
transition
vaporisation
NONE OF THESE
When pressure is applied on the system, icewater, then
evaporation of water will take place.
More water will be formed.
more ice will be formed.
equilibrium can not be established.
1
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