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1) In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will___________________? a. Increase the partial pressure of H2 b. Increase the partial pressure of I2 c. Increase the total pressure and hence shift the equilibrium towards the right d. Not affect the equilibrium conditions
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2) Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)__________________? a. T b. √T c. T2 d. 1/√T
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3) is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions ? a. The amount of work needed is path dependent b. Work alone cannot bring out such a change of state c. The amount of work needed is independent of path d. More information is needed to conclude anything about the path dependence or otherwise of the work needed
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4) The four properties of a system viz. P, V, T, S are related by ______________ equation? a. Gibbs-Duhem b. Gibbs-Helmholtz c. Maxwell’s d. None of these
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5) Clausius-Clapeyron equation is applicable to _____________ equilibrium processes? a. Solid-vapor b. Solid-liquid c. Liquid-vapor d. All A, B. and C
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6) During the phase transition, _______________ changes? a. Pressure b. Volume c. Temperature d. All A , B. and C
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7) The activity of an ideal gas is numerically ____________ its pressure? a. More than b. Less than c. Equal to d. Data insufficient, can’t be predicted
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8) Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be___________________? a. Same b. Doubled c. Halved d. One fourth of its original value
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9) Claude gas liquefaction process employs cooling___________________? a. At constant pressure b. By throttling c. By expansion in an engine d. None of these
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10) Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________? a. Work required to refrigeration obtained b. Refrigeration obtained to the work required c. Lower to higher temperature d. Higher to lower temperature
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11) Change of state namely evaporation condensation, freezing and melting is an _______________ process? a. Isothermal b. Adiabatic c. Isobaric d. Isochoric
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12) ________________ decreases during adiabatic throttling of a perfect gas? a. Entropy b. Temperature c. Enthalpy d. Pressure
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13) The first law of thermodynamics is a restatement of the law of conservation of_________________? a. Mass b. Energy c. Momentum d. None of these
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14) A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid? a. Sub-cooled b. Saturated c. Non-solidifiable d. None of these
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15) The unit of equilibrium constant of a chemical reaction is the same as that of__________________? a. Molar concentration b. Temperature c. Internal energy d. None of these
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16) The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is_________________? a. R loge 4 b. R log10 4 c. Cv log10 4 d. Cv loge 4
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17) (∂H/∂T)P is the mathematical expression for____________________? a. CV b. Entropy change c. Gibbs free energy d. None of these
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18) With increase in temperature, the internal energy of a substance___________________? a. Increases b. Decreases c. Remains unchanged d. May increase or decrease; depends on the substance
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19) All gases above its inversion temperature, in a throttling process will show__________________? a. A heating effect b. No change in temperature c. A cooling effect d. Either A. or (C)
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20) If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c? a. 100 b. 50 c. 205 d. 200
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21) The internal energy of a gas obeying P (V – b) RT (where, b is a positive constant and has a constant Cv), depends upon its________________? a. Pressure b. Volume c. Temperature d. All A, B. & C
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22) Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ? a. dE = Tds – PdV b. dQ = CvdT + PdV c. dQ = CvdT + PdV d. Tds = dE – PdV
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23) In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process? a. Adiabatic b. Reversible c. Isothermal d. None of these
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24) The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________? a. 0 b. +ve c. -ve d. ∞
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25) Clausius-Clapeyron Equation gives accurate result, when the __________________? a. Vapour pressure is relatively low and the temperature does not vary over wide limits b. Vapour obeys the ideal gas law and the latent heat of vaporisation is constant c. Volume in the liquid state is negligible compared with that in the vapour state d. All A, B. and C
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26) Any substance above its critical temperature exists as _____________________? a. Saturated vapour b. Solid c. Gas d. Liquid
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27) Which is not constant for an ideal gas ? a. (∂P/∂V)T b. (∂V/∂T)P c. (∂P/∂V)V d. All (A), B. & (C)
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28) Refrigeration capacity of a household refrigerator may be round about _____________ tons? a. 0.15 b. 1.5 c. 4.5 d. 6.5
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29) Boiling of liquid is accompanied with increase in the__________________? a. Vapor pressure b. Specific Gibbs free energy c. Specific entropy d. All (A), B. and (C)
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30) The number of degrees of freedom for a mixture of ice and water (liquid) are ____________________? a. 3 b. 2 c. 1 d. 0
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