Practice Test


1) Which of the following is not an intensive property?


2) In a bomb calorimeter, the heat of reaction is measured at


3) If temperature remains constant during the process, it is called an


4) The entropy of the universe


5) Which of the following enthalpies is always negative?


6) Which of the following has highest entropy?


7) Entropy change for an adiabatic reversible process is


8) The temperature of the system decreases in an


9) Thermodynamic equilibrium involves


10) The enthalpies of elements in their standard state are taken as zero. Hence the enthalpy of formation of a compound


11) When potassium chloride is dissolved in water


12) According to third law of thermodynamics, the entrophy of crystalline substances at absolute zero is taken as


13) All the naturally occurring processes proceed spontaneously in a direction which leads to


14) Free energy, G may be defined as


15) When a solid changes into liquid, the entropy


16) Entropy is a measure of


17) When a solid is converted directly into gaseous state , the process is called sublimation. The entropy change during the process is


18) Which of the following processes is accompanied by decrease in entropy?


19) A spontaneous change in one in which the system suffers.


20) If there is no exchange of heat between the system and the surrounding during the process. It is called


21) An endothermic reaction is allowed to occur very rapidly in the air. The temperature of the surrounding air


22) Which of the following is not an intensive property?


23) Which of the following is not a state function?


24) Which of the following modes of energy constitutes both kinetic energy and potential energy?


25) Which of the following gases has the highest heat of combution?


26) The energy of molecular motion appears in the form of


27) The enthalpies of formation of organic substances are conveniently determined from


28) Two objects are said to be in thermal equilibrium if they have same


29) An isolated system is that system in which


30) The entropy of a perfect crystalline solid at absolute zero is


31) Variation of heat of reaction with temperature is known as


32) The free energy change for a reaction is zero when


33) The enthalpy of formation of two compounds A and B are -84kJ and -156kJ respectively. Which one of the following statements is correct?


34) The change in entropy of an ideal gas during a reversible isothermal expansion is


35) In which case of mixing of a strong acid and a strong base each of 1 M concentration, temperature increase is highest?


36) Which of the following is not an endothermic reaction?


37) In thermodynamics, a process is called reversible when


38) Which of the following statements is false?


39) The enthalpy change for a reaction does not depend upon


40) Identify the correct statement regarding a spontaneous process


41) In an exothermic reaction, the reactants


42) The variation of heat of reaction with temperature is given by an equation known as


43) In an endothermic reaction


44) An adiabatic process is one in which


45) Which of the following processes is not accompanied by increase of entropy?


46) Which of the following conditions is not favourable for the feasibility of a process?


47) In which of the following cases, the reaction is spontaneous at all temperatures?


48) In an adiabatic expansion of an ideal gas


49) Which of the following reaction represents enthalpy of formation of AgCl?


50) For a reversible process at equilibrium, the change in entropy may be expressed as


51) Free energy is related to enthalpy and entropy changes as


52) For an equilibrium state.


53) Which of the following neutralisation reactions is most exothermic?


54) Which of the following equations represents standard heat of formation of methane?


55) The units of entropy are


56) Which of the following quantities is not a state function?


57) In an isothermal expansion of an ideal gas


58) For a spontaneous endothermic reaction


59) The heat of combustion of yellow phosphorus and red phosphorus are -9.91 kJ and -8.78 kJ respectively. The heat of transition of yellow phosphorus to red phosphorus is


60) For an ideal gas, the joule Thomson co-efficient is equal to


61) The entalpies of combustion of some fuels are given below. Which of these has lowest efficiency as fuel per gram?


62) Which of the following statements / relationships is not correct?


63) When 1000 ml of a 1M solution of sulphuric acid is neutralised by a strong base in dilute solution. The standard enthalpy of neutralisation is


64) Which of the following salts will have maximum cooling effect when 0.5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt?


65) Which of the following properties of a system undergoing change at a constant temperature and pressure is a measure of the maximum useful work that the system can do?


66) Which of the following values of heat of formation indicates that the product is least stable?


67) In which of the following neutralisation reaction. the heat of neutralisation will be highest?


68) For a reaction to be spontaneous at all temperatures


69) The enthalpy of neutralisation of any strong acid and strong base is nearly equal to


70) For a reaction to occur spontaneously


71) For n moles of an ideal gas


72) Which of the following expressions is true?


73) When an ideal gas is suddenly allowed to expand adiabatically into an evacuated container, then


74) Molar heat capacity of water in equilibrium with ice at constant pressure is


75) The bond energies of C - C, C = C, H- H and C - H linkages are 350, 600, 400 and 410 kJ per mol respectively. The heat of hydrogenation of ethylene is


76) Two moles of an ideal gas is expanded isothermally and reversibly from 1 L to 10 L at 300 K. The enthalpy change (in kJ) for the process is


77) For a reaction to proceed simultaneously.


78) When 1 mole of a gas is heated at constant volume, temperature is raised from 298K to 308K. Heat supplied to the gas is 500J. Then which statement is correct


79) If the system does not exchange heat with the surrounding, the process is


80) Which of the following is an intensive property?


81) System in which there is no exchange of matter work or energy with the surrounding is


82) Considering entropy (s) as a thermodynamic parameter, the criterion for the spontaneity of any process is


83) The enthalpy of a monoatomic gas at T kelvin is


84) A reaction occurs spontaneously if


85) Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?


86) Which of the following are not state functions?
(I) q + w
(II) q
(III) w
(IV) H - TS


87) Thermodynamically the most stable from of carbon is


88) Which of these species has a standard enthalpy of formation equal to zero?


89) Which one of the following demonstrates a decrease in entropy?


90) Which of the following is correct option for free expansion of an ideal gas under adiabatic condition?


91) When an ideal gas is allowed to expand adiabatically into an evacuted vessel then


92) A gas expands from 1.5 L to 6.5 L against a constant pressure of 0.5 atm and during this process, the gas also absorbs 100 J of heat. The change in internal energy is


93) Which of the following is not true regarding entropy?


94) the standard enthalpy of combustion of solid boron is equal to


95) The state of maximum entropy for water is


96) The net energy change in a reversible cyclic process is


97) Which of the following set contain only all extensive or intensive properties?


98) Which of the following statements is false?


99) In thermodynamics, a process is called reversible when


100) Which of the following expression is true?


101) The total entropy change for a system and its surroundings increases, if the process is


102) The change in entropy of an ideal gas during a reversible isothermal expansion is


103) For which of the following reaction, the change in enthalpy is equal to change in internal energy?


104) 4.6 g of iron combines with sulphur evolving 8.27 kJ. The heat of formation of iron sulphide is


105) Which of the following statement is not correct?


106) In which of the following, entropy decreases: