0% 0 Thermodynamics for Chemical Quiz 9 1 / 50 The third law of thermodynamics states that the___________? None of these Heat transfer from low temperature to high temperature source is not possible without external work Gases having same reduced properties behaves similarly Heat capacity of a crystalline solid is zero at absolute zero temperature 2 / 50 The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is___________? 2 RT 0.5 RT -2 RT ln 0.5 -RT ln 0.5 3 / 50 The necessary condition for phase equilibrium in a multiphase system of N components is that the______? Chemical potentials of a given component should be equal in all phases Chemical potentials of all components should be same in a particular phase Sum of the chemical potentials of any given component in all the phases should be the same None of these 4 / 50 The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is___________? 1 0 2 3 5 / 50 The quantitative effect of temperature on chemical equilibrium is given by the______? Van?t-Hoff equation Le-Chatelier?s principle Arrhenius equation None of these 6 / 50 The standard Gibbs free energy change of a reaction depends on the equilibrium________? Pressure Composition All A, B. and C Temperature 7 / 50 Third law of thermodynamics is concerned with the___________? None of these Value of absolute entropy Energy transfer Direction of energy transfer 8 / 50 Trouton?s ratio of _______ liquids is calculated using Kistyakowsky equation? Polar Neither A. nor B Both A. & B Non-polar 9 / 50 The work done in isothermal compression compared to that in adiabatic compression will be___________? Less More or less depending upon the extent of work done Same More 10 / 50 The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of_________? T and Z T T, P and Z T and P 11 / 50 What happens in a reversible adiabatic compression ? Pressure is constant Heating occurs Temperature is constant Cooling occurs 12 / 50 The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are___________? Two Zero One Three 13 / 50 The value of gas constant ?R? is___________? 1.987 cal/gm mole ?K Both A. and B 1.987 BTU/lb. mole ?R Neither A. nor B 14 / 50 The temperature at which both liquid and gas phases are identical, is called the ______ point? Boiling Critical Triple Freezing 15 / 50 The reaction A (l) ? R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ? 2 3 0 1 16 / 50 Throttling (Joule-Thomson effect) process is a constant ______ process? Entropy None of these Enthalpy Pressure 17 / 50 Water on heating from 1 to 4?C_____? May contract or expand Contracts Has same volume Expands 18 / 50 The standard state of a gas (at a given temperature) is the state in which fugacity is equal to___________? Neither A. nor B Both A. & B Activity Unity 19 / 50 The thermodynamic law, PVy = constant, is not applicable in case of_______? Adiabatic compression of a perfect gas Free expansion of an ideal gas Ideal compression of air Adiabatic expansion of steam in a turbine 20 / 50 There is a change in _______ during the phase transition? All a, b & c Volume Pressure Temperature 21 / 50 Throttling process is a/an ______ process? Reversible and constant entropy Reversible and constant enthalpy Irreversible and constant enthalpy Reversible and isothermal 22 / 50 The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann?s constant, T = absolute temperature) ? 3KT/m ?(6KT/m) ?(3KT/m) ?(2KT/m) 23 / 50 The work done in an adiabatic change in a particular gas depends upon changes in the _______ only? Pressure Volume Temperature Specific heat 24 / 50 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_____? One fourth of its original value Doubled Halved Same 25 / 50 The variation of heat of reaction with temperature at constant pressure is given by the _____ law? Kirchoff?s Kelvin?s None of these Antoine?s 26 / 50 The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by______? (?H/R) (1/T1 ? 1/T2) (?H/R) (1/T2 ? 1/T1) (1/R) (1/T1 ? 1/T2) (R/?H) (1/T1 ? 1/T2) 27 / 50 The number of degrees of freedom for a mixture of ice and water (liquid) are ______? 3 0 1 2 28 / 50 Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a ______ vapour? None of these Superheated Desuperheated Non-condensable 29 / 50 The partial pressure of each constituent present in an alloy is ______ the total vapor pressure exerted by the alloy? Equal to More than Less than Either B. or C; depends on the type of alloy 30 / 50 The unit of equilibrium constant of a chemical reaction is the same as that of___________? Temperature None of these Internal energy Molar concentration 31 / 50 The number of degrees of freedom at the triple point of water is___________? 1 2 3 0 32 / 50 Trouton?s ratio is given by (where ?b, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, ?K) _____? Tb/?b ?(?b/Tb) ?(Tb/?b) ?b/Tb 33 / 50 The point at which all the three (solid, liquid and gas) phases co-exist, is known as the _____ point? Boyle Boiling Triple Freezing 34 / 50 The total change in the enthalpy of a system is independent of the _________? Pressure and temperature Number of intermediate chemical reactions involved None of these State of combination and aggregation in the beginning and at the end of the reaction 35 / 50 The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is_________? ? #NAME? 0 #NAME? 36 / 50 The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the ______ equation? Gibbs-Duhem Gibbs-Helmholtz Margules Van Laar 37 / 50 The unity of Planck?s constant ?h? in the equation, E = hv is______? J/s kmol/J J.S J/kmol 38 / 50 The principle applied in liquefaction of gases is_______? Adiabatic expansion Neither A. nor B Joule-Thomson effect Both A. and B 39 / 50 The shape of T-S diagram for Carnot Cycle is a___________? Circle Rhombus Rectangle Trapezoid 40 / 50 The temperature at the eutectic point of the system is the ______ temperature that can be attained in the system? Average Highest None of these Lowest 41 / 50 Van Laar equation deals with the activity co-efficients in_____? Azeotropic mixture only Ternary solutions Binary solutions None of these 42 / 50 The unit of fugacity is the same as that of the__________? Temperature Pressure Molar concentration Volume 43 / 50 Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the _____ equation? None of these Gibbs-Duhem Clapeyron Maxwell?s 44 / 50 To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (?HV/R) (1/T1 ? 1/T2) from the exact Clapeyron equation, it is assumed that the______? Heat of vaporisation is independent of temperature Volume of the liquid phase is negligible compared to that of vapour phase All A , B. & C. Vapour phase behaves as an ideal gas 45 / 50 The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.?K are_________? 3.987 & 1.987 1.987 & 0.66 5 & 3 0.66 & 1.987 46 / 50 Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called _____ solutions? Ideal Real Isotonic None of these 47 / 50 Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the___________? Cold reservoir approaches zero Hot reservoir approaches infinity Neither A. nor B Either A. or B 48 / 50 Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)___________? 1/?T ?T T T2 49 / 50 The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the _____ temperature? Inversion Boyle Critical Reduced 50 / 50 Third law of thermodynamics is helpful in_____? Both B. and C. Evaluating entropy changes of chemical reaction Prediction of the extent of a chemical reaction Calculating absolute entropies of substances at different temperature Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevThermodynamics for Chemical Quiz 8 Thermodynamics for Chemical Quiz 10Next
