0% 0 Thermodynamics for Chemical Quiz 9 1 / 50 What happens in a reversible adiabatic compression ? Heating occurs Cooling occurs Temperature is constant Pressure is constant 2 / 50 The temperature at which both liquid and gas phases are identical, is called the ______ point? Critical Boiling Freezing Triple 3 / 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 4 / 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 P T, P and Z T T and Z 5 / 50 Van Laar equation deals with the activity co-efficients in_____? Azeotropic mixture only Ternary solutions None of these Binary solutions 6 / 50 Throttling process is a/an ______ process? Reversible and constant enthalpy Reversible and constant entropy Irreversible and constant enthalpy Reversible and isothermal 7 / 50 The number of degrees of freedom for a mixture of ice and water (liquid) are ______? 2 3 1 0 8 / 50 The variation of heat of reaction with temperature at constant pressure is given by the _____ law? Kirchoff?s Kelvin?s Antoine?s None of these 9 / 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______? Vapour phase behaves as an ideal gas Heat of vaporisation is independent of temperature Volume of the liquid phase is negligible compared to that of vapour phase All A , B. & C. 10 / 50 Trouton?s ratio of _______ liquids is calculated using Kistyakowsky equation? Polar Non-polar Neither A. nor B Both A. & B 11 / 50 Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a ______ vapour? Superheated None of these Non-condensable Desuperheated 12 / 50 The temperature at the eutectic point of the system is the ______ temperature that can be attained in the system? None of these Highest Average Lowest 13 / 50 The unity of Planck?s constant ?h? in the equation, E = hv is______? J.S J/s kmol/J J/kmol 14 / 50 The point at which all the three (solid, liquid and gas) phases co-exist, is known as the _____ point? Boyle Boiling Triple Freezing 15 / 50 The thermodynamic law, PVy = constant, is not applicable in case of_______? Adiabatic compression of a perfect gas Adiabatic expansion of steam in a turbine Ideal compression of air Free expansion of an ideal gas 16 / 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 Reduced Critical 17 / 50 Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)___________? T ?T T2 1/?T 18 / 50 Third law of thermodynamics is helpful in_____? Prediction of the extent of a chemical reaction Both B. and C. Calculating absolute entropies of substances at different temperature Evaluating entropy changes of chemical reaction 19 / 50 The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are___________? Two One Three Zero 20 / 50 The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is_________? #NAME? #NAME? ? 0 21 / 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___________? -RT ln 0.5 0.5 RT 2 RT -2 RT ln 0.5 22 / 50 Third law of thermodynamics is concerned with the___________? None of these Direction of energy transfer Value of absolute entropy Energy transfer 23 / 50 The principle applied in liquefaction of gases is_______? Both A. and B Adiabatic expansion Neither A. nor B Joule-Thomson effect 24 / 50 The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is___________? 3 1 2 0 25 / 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) ? ?(6KT/m) ?(3KT/m) 3KT/m ?(2KT/m) 26 / 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) Tb/?b ?(?b/Tb) ?b/Tb 27 / 50 The work done in an adiabatic change in a particular gas depends upon changes in the _______ only? Specific heat Pressure Volume Temperature 28 / 50 The standard Gibbs free energy change of a reaction depends on the equilibrium________? Pressure All A, B. and C Composition Temperature 29 / 50 The unit of equilibrium constant of a chemical reaction is the same as that of___________? None of these Temperature Molar concentration Internal energy 30 / 50 The work done in isothermal compression compared to that in adiabatic compression will be___________? More or less depending upon the extent of work done More Same Less 31 / 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_____? Doubled Same One fourth of its original value Halved 32 / 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 ? 3 0 2 1 33 / 50 The unit of fugacity is the same as that of the__________? Molar concentration Temperature Pressure Volume 34 / 50 The partial pressure of each constituent present in an alloy is ______ the total vapor pressure exerted by the alloy? Equal to Either B. or C; depends on the type of alloy More than Less than 35 / 50 The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by______? (?H/R) (1/T1 ? 1/T2) (1/R) (1/T1 ? 1/T2) (R/?H) (1/T1 ? 1/T2) (?H/R) (1/T2 ? 1/T1) 36 / 50 The shape of T-S diagram for Carnot Cycle is a___________? Circle Rhombus Rectangle Trapezoid 37 / 50 Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the___________? Neither A. nor B Cold reservoir approaches zero Hot reservoir approaches infinity Either A. or B 38 / 50 There is a change in _______ during the phase transition? Pressure Temperature Volume All a, b & c 39 / 50 The third law of thermodynamics states that the___________? Heat capacity of a crystalline solid is zero at absolute zero temperature 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 40 / 50 The number of degrees of freedom at the triple point of water is___________? 3 0 1 2 41 / 50 The total change in the enthalpy of a system is independent of the _________? Pressure and temperature None of these State of combination and aggregation in the beginning and at the end of the reaction Number of intermediate chemical reactions involved 42 / 50 Throttling (Joule-Thomson effect) process is a constant ______ process? Pressure None of these Entropy Enthalpy 43 / 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-Helmholtz Margules Gibbs-Duhem Van Laar 44 / 50 Water on heating from 1 to 4?C_____? Contracts Has same volume May contract or expand Expands 45 / 50 The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.?K are_________? 3.987 & 1.987 0.66 & 1.987 1.987 & 0.66 5 & 3 46 / 50 The value of gas constant ?R? is___________? Both A. and B Neither A. nor B 1.987 cal/gm mole ?K 1.987 BTU/lb. mole ?R 47 / 50 Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the _____ equation? Maxwell?s Gibbs-Duhem None of these Clapeyron 48 / 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 None of these Sum of the chemical potentials of any given component in all the phases should be the same Chemical potentials of all components should be same in a particular phase 49 / 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 50 / 50 The standard state of a gas (at a given temperature) is the state in which fugacity is equal to___________? Both A. & B Neither A. nor B Activity Unity 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
