JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank

done 2nd and 3rd law of thermodynamics and Entropy Total Questions - 68

• question_answer1)
  For a reversible spontaneous change \[\Delta S\] is
  A)
                  \[\frac{\Delta E}{T}\]      done clear
  B)
                  \[\frac{P\,\Delta V}{T}\] done clear
  C)
                  \[\frac{q}{T}\]   done clear
  D)
                  RT log K done clear
  View Solution play_arrow

• question_answer2)
  When disorder of a system increases, the change is said to be
  A)
                  Exothermic         done clear
  B)
                  Non-spontaneous done clear
  C)
                  Endothermic      done clear
  D)
                  Spontaneous done clear
  View Solution play_arrow

• question_answer3)
  The spontaneous flow of heat is always
  A)
                  From low to high pressure done clear
  B)
                  From high to high pressure done clear
  C)
                  Unidirectional from lower temperature to higher temperature done clear
  D)
                  Unidirectional from the higher to lower temperature done clear
  View Solution play_arrow

• question_answer4)
  Mixing of non-reacting gases is generally accompanied by
  A)
                  Decrease in entropy done clear
  B)
                  Increase in entropy done clear
  C)
                  Change in enthalpy done clear
  D)
                  Change in free energy done clear
  View Solution play_arrow

• question_answer5)
  An irreversible process occuring isothermally in an isolated system leads to
  A)
                  Zero entropy done clear
  B)
                  An increase in the total entropy of the system done clear
  C)
                  A decrease in the total entropy of the system done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer6)
  The entropy values (in JK-1 mol-1) of H2(g) = 130.6, Cl2(g) = 223.0 and HCl(g) = 186.7 at 298 K and 1 atm pressure. Then entropy change for the reaction                 \[{{H}_{2(g)}}+C{{l}_{2(g)}}\to 2HC{{l}_{(g)}}\] is                                               [BHU 2005]
  A)
                  + 540.3  done clear
  B)
                  + 727.3 done clear
  C)
                  ? 166.9  done clear
  D)
                  + 19.8 done clear
  View Solution play_arrow

• question_answer7)
  Which of the following is the least random state of water
  A)
                  Ice done clear
  B)
                  Liquid water done clear
  C)
                  Steam done clear
  D)
                  All present same random state done clear
  View Solution play_arrow

• question_answer8)
  Which one of the following process is non-spontaneous
  A)
                  Dissolution of \[CuS{{O}_{4}}\] in water done clear
  B)
                  Reaction between \[{{H}_{2}}\] and \[{{O}_{2}}\] to form water done clear
  C)
                  Water flowing down hill done clear
  D)
                  Flow of electric current from low potential to high potential done clear
  View Solution play_arrow

• question_answer9)
  Which of the following is zero during adiabatic expansion of the gas
  A)
                  \[\Delta T\]         done clear
  B)
                  \[\Delta S\] done clear
  C)
                  \[\Delta E\]         done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer10)
  The entropy of crystalline substances at absolute zero going by the third law of thermodynamics should be taken as [J & K 2005]
  A)
                  100 done clear
  B)
                  50 done clear
  C)
                  Zero done clear
  D)
                  Different for different substances done clear
  View Solution play_arrow

• question_answer11)
  In which state, the matter have highest entropy
  A)
                  Solid      done clear
  B)
                  Liquid done clear
  C)
                  Gas        done clear
  D)
                  Equal in all done clear
  View Solution play_arrow

• question_answer12)
  Which of the following pairs of a chemical reaction is certain to result in spontaneous reaction ? [CBSE PMT 2005]
  A)
                  Exothermic and decreasing disorder done clear
  B)
                  Endothermic and increasing disorder done clear
  C)
                  Exothermic and increasing disorder done clear
  D)
                  Endothermic and decreasing disorder done clear
  View Solution play_arrow

• question_answer13)
  When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in Kelvin would be             [IIT 2005]
  A)
                  \[\frac{T}{{{2}^{(2/3)}}}\]             done clear
  B)
                  T + \[\frac{2}{3\times 0.0821}\] done clear
  C)
                  T              done clear
  D)
                  T - \[\frac{2}{3\times 0.0821}\] done clear
  View Solution play_arrow

• question_answer14)
  9.0 gm of \[{{H}_{2}}O\] is vaporised at \[{{100}^{o}}C\] and 1 atm pressure. If the latent heat of vaporisation of water is \[x\,J/gm\], then \[\Delta S\] is given by
  A)
                  \[\frac{x}{373}\]               done clear
  B)
                  \[\frac{18x}{100}\] done clear
  C)
                  \[\frac{18x}{373}\]          done clear
  D)
                  \[\frac{1}{2}\times \frac{18x}{373}\] done clear
  View Solution play_arrow

• question_answer15)
  The  \[\Delta S\] for the vaporisation of 1 mol of water is 88.3  J/mole K. The value of \[\Delta S\] for the condensation of  1 mol of vapour will be
  A)
                  88.3 J/mol K        done clear
  B)
                  \[{{(88.3)}^{2}}\] J/mol K done clear
  C)
                  ? 88.3 J/mol K    done clear
  D)
                  \[\frac{1}{88.3}\] J/mol K done clear
  View Solution play_arrow

• question_answer16)
  For which reaction from the following, \[\Delta S\] will be maximum [AlIMS 1982, 83, 94; AMU 2000]
  A)
                  \[Ca(s)+\frac{1}{2}{{O}_{2}}(g)\to CaO(s)\] done clear
  B)
                  \[CaC{{O}_{3}}(s)\to CaO(s)+C{{O}_{2}}(g)\] done clear
  C)
                  \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] done clear
  D)
                  \[{{N}_{2}}(g)+{{O}_{2}}(g)\to 2NO(g)\] done clear
  View Solution play_arrow

• question_answer17)
  The occurrence of a reaction is impossible if [AIIMS 1982, 91; MP PET 1997; MP PMT 1999; DPMT 2002]
  A)
                  \[\Delta H\] is +ve ; \[\Delta S\] is also + ve but \[\Delta H<T\Delta S\] done clear
  B)
                  \[\Delta H\] is ? ve ;  \[\Delta S\] is also ? ve  but \[\Delta H\,>\,T\Delta S\] done clear
  C)
                  \[\Delta H\] is  ? ve ; \[\Delta S\] is + ve done clear
  D)
                  \[\Delta H\] is + ve ;  \[\Delta S\] is ? ve done clear
  View Solution play_arrow

• question_answer18)
  If the enthalpy of vaporization for water is 186.5 kJ \[mo{{l}^{-1}}\], the entropy of its vaporization will be [CPMT 1988; DCE 2000]
  A)
                  \[0.5\,J{{K}^{-1}}mo{{l}^{-1}}\] done clear
  B)
                  \[1.0\,J{{K}^{-1}}mo{{l}^{-1}}\] done clear
  C)
                  \[1.5\,J{{K}^{-1}}mo{{l}^{-1}}\] done clear
  D)
                  \[2.0\,J{{K}^{-1}}mo{{l}^{-1}}\] done clear
  View Solution play_arrow

• question_answer19)
  Which of the following statement is true. The entropy of the universe   [MP PMT 1993; CET Pune 1998]
  A)
                  Increases and tends towards maximum value done clear
  B)
                  Decreases and tends to be zero done clear
  C)
                  Remains constant done clear
  D)
                  Decreases and increases with a periodic rate done clear
  View Solution play_arrow

• question_answer20)
  When enthalpy and entropy change for a chemical reaction are \[-2.5\,\times {{10}^{3}}\,cal\] and \[7.4\,cal\] \[{{\deg }^{-1}}\] respectively. Predict the reaction at \[298\,K\] is [AFMC 1998; MH CET 1999; CBSE PMT 2000]
  A)
                  Spontaneous     done clear
  B)
                  Reversible done clear
  C)
                  Irreversible         done clear
  D)
                  Non-spontaneous done clear
  View Solution play_arrow

• question_answer21)
  The total entropy change for a system and its surroundings increases, if the process is
  A)
                  Reversible           done clear
  B)
                  Irreversible done clear
  C)
                  Exothermic         done clear
  D)
                  Endothermic done clear
  View Solution play_arrow

• question_answer22)
  For chemical reactions, the calculation of change in entropy is normally done
  A)
                  At constant pressure done clear
  B)
                  At constant temperature done clear
  C)
                  At constant temperature and pressure both done clear
  D)
                  At constant volume done clear
  View Solution play_arrow

• question_answer23)
  When the value of entropy is greater, then the ability of work
  A)
                  Is maximum       done clear
  B)
                  Is minimum done clear
  C)
                  Is medium           done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer24)
  Which of the following is true for the reaction \[{{H}_{2}}O(l)\]⇌\[{{H}_{2}}O(g)\] at \[{{100}^{o}}C\] and 1 atmosphere [KCET 1991; AIIMS 1996]
  A)
                  \[\Delta E=0\]    done clear
  B)
                  \[\Delta H=0\] done clear
  C)
                  \[\Delta H=\Delta E\]     done clear
  D)
                  \[\Delta H=T\Delta S\] done clear
  View Solution play_arrow

• question_answer25)
  The enthalpy change for the transition of liquid water to steam, \[\Delta {{H}_{vap}}=37.3\,kJ\,mo{{l}^{-1}}\] at \[373\,K\]. The entropy change for the process is             [MP PET 1994]
  A)
                  \[111.9\,J\,mo{{l}^{-1}}{{K}^{-1}}\]          done clear
  B)
                  \[37.3\,J\,mo{{l}^{-1}}\,{{K}^{-1}}\] done clear
  C)
                  \[100\,J\,mo{{l}^{-1}}{{K}^{-1}}\]              done clear
  D)
                  \[74.6\,J\,mo{{l}^{-1}}{{K}^{-1}}\] done clear
  View Solution play_arrow

• question_answer26)
  When a solid is converted into liquid, entropy [MP PET 1993, 95; MP PMT 1996]
  A)
                  Becomes zero   done clear
  B)
                  Remains the same done clear
  C)
                  Decreases           done clear
  D)
                  Increases done clear
  View Solution play_arrow

• question_answer27)
  In a spontaneous process, the entropy of the system and its surroundings           [MP PET 1996; NCERT 1975]
  A)
                  Equals zero done clear
  B)
                  Decreases done clear
  C)
                  Increases             done clear
  D)
                  Remains constant                 done clear
  View Solution play_arrow

• question_answer28)
  The positive value of \[\Delta S\] indicates that [MP PMT 1997]
  A)
                  The system becomes less disordered done clear
  B)
                  The system becomes more disordered done clear
  C)
                  The system is in equilibrium position done clear
  D)
                  The system tends to reach at equilibrium position done clear
  View Solution play_arrow

• question_answer29)
  For reaction \[2Cl(s)\to C{{l}_{2}}(s)\], the signs of \[\Delta H\] and \[\Delta S\] respectively are                [KCET 1996]
  A)
                  +, ? done clear
  B)
                  +, + done clear
  C)
                  ?, ?        done clear
  D)
                  ?, + done clear
  View Solution play_arrow

• question_answer30)
  The enthalpy of water is \[386\,kJ\]. What is entropy of water [BHU 1997]
  A)
                  0.5 kJ     done clear
  B)
                  1.03 kJ done clear
  C)
                  1.5 kJ     done clear
  D)
                  22.05 kJ done clear
  View Solution play_arrow

• question_answer31)
  For which of the processes is \[\Delta S\] negative           [Pb. PMT 1998]
  A)
                  \[{{H}_{2}}(g)\to 2H(g)\] done clear
  B)
                  \[{{N}_{2}}(g)\,1atm\to {{N}_{2}}(g)\,8\,atm\] done clear
  C)
                  \[2S{{O}_{3}}(g)\to 2S{{O}_{2}}(g)+{{O}_{2}}(g)\] done clear
  D)
                  \[{{C}_{(diamond)}}\to {{C}_{(graphite)}}\] done clear
  View Solution play_arrow

• question_answer32)
  Identify the correct statement regarding entropy [CBSE PMT 1998; BHU 2001]
  A)
                  At \[{{0}^{o}}C\], the entropy of a perfectly crystalline substance is taken to be zero done clear
  B)
                  At absolute zero of temperature, the entropy of a perfectly crystalline substance is \[+ve\] done clear
  C)
                  At absolute zero of temperature, the entropy of all crystalline substances is taken to be zero done clear
  D)
                  At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero done clear
  View Solution play_arrow

• question_answer33)
  One mole of an ideal gas at \[300K\] is expanded isothermally from an initial volume of 1 litre to 10 litres. The change in energy for this process is \[(R=2\,cal\,mo{{l}^{-1}}{{K}^{-1}})\] [CBSE PMT 1998]
  A)
                  163.7 cal               done clear
  B)
                  850.2 cal done clear
  C)
                  1381.1 cal            done clear
  D)
                  Zero done clear
  View Solution play_arrow

• question_answer34)
  If \[900\,J/g\] of heat is exchanged at boiling point of water, then what is increase in entropy     [BHU 1998]
  A)
                  43.4 J/mole         done clear
  B)
                  87.2 J/mole done clear
  C)
                  900 J/mole          done clear
  D)
                  Zero done clear
  View Solution play_arrow

• question_answer35)
  A container has hydrogen and oxygen mixture in ratio of  4 : 1 by weight, then   [BHU 1998]
  A)
                  Internal energy of the mixture decreases done clear
  B)
                  Internal energy of the mixture increases done clear
  C)
                  Entropy of the mixture increases done clear
  D)
                  Entropy of the mixture decreases done clear
  View Solution play_arrow

• question_answer36)
  If 0.75 mole of an ideal gas expands isothermally at \[{{27}^{o}}C\] from 15 litres to 25 litres, the maximum work obtained is [AFMC 1999]
  A)
                  8.40 J     done clear
  B)
                  9.34 J done clear
  C)
                  10.86 J   done clear
  D)
                  10.43 J done clear
  View Solution play_arrow

• question_answer37)
  In which of the following conditions a chemical reaction can not occur    [AMU 1999]
  A)
                  \[\Delta H\] and\[\Delta S\] increase and \[T\Delta S>\Delta H\] done clear
  B)
                  \[\Delta H\] and \[\Delta S\] decrease and \[\Delta H>T\Delta S\] done clear
  C)
                  \[\Delta H\] increases and \[\Delta S\] decreases done clear
  D)
                  \[\Delta H\] decreases and \[\Delta S\] increases done clear
  View Solution play_arrow

• question_answer38)
  An engine operating between \[{{150}^{o}}C\] and \[{{25}^{o}}C\] takes 500 J heat from a higher temperature reservoir if there are no frictional losses, then work done by engine is [MH CET 1999]
  A)
                  147.7 J   done clear
  B)
                  157.75 J done clear
  C)
                  165.85 J done clear
  D)
                  169.95 J done clear
  View Solution play_arrow

• question_answer39)
  The entropy of a perfectly crystalline solid at absolute zero is [AMU 2000]
  A)
                  Positive                done clear
  B)
                  Negative done clear
  C)
                  Zero       done clear
  D)
                  Not definite done clear
  View Solution play_arrow

• question_answer40)
  Which of the following conditions will always lead to a non-spontaneous change               [AMU 2000; KCET (Med.) 2000]
  A)
                  Positive \[\Delta H\] and positive \[\Delta S\] done clear
  B)
                  Negative \[\Delta H\] and negative \[\Delta S\] done clear
  C)
                  Positive \[\Delta H\] and negative \[\Delta S\] done clear
  D)
                  Negative \[\Delta H\] and positive \[\Delta S\] done clear
  View Solution play_arrow

• question_answer41)
  Following data is known about melting of a compound AB. \[\Delta H=9.2\,kJ\,mo{{l}^{-1}}\], \[\Delta S=0.008\,kJ\,{{K}^{-1}}mo{{l}^{-1}}\]. Its melting point is               [Pb. PMT 2000; AIIMS 2000]
  A)
                  736 K     done clear
  B)
                  1050 K done clear
  C)
                  \[1150\,K\]         done clear
  D)
                  \[{{1150}^{o}}C\] done clear
  View Solution play_arrow

• question_answer42)
  The volume of a gas decreases from \[500\,cc\] to \[300\,cc\] when a sample of gas is compressed by an average pressure of 0.6 atm. During this process 10 J of heat is liberated. The change in internal energy is              [Pb. PMT 2000]
  A)
                  ? 2.16 J done clear
  B)
                  12.156 J done clear
  C)
                  2.16 J     done clear
  D)
                  101.3 J done clear
  View Solution play_arrow

• question_answer43)
  The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.690 and \[205\,J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}(g)\] is  [CPMT 2001]
  A)
                  \[1.86\,J{{K}^{-1}}\]        done clear
  B)
                  \[1.96\,J{{K}^{-1}}\] done clear
  C)
                  \[2.81\,J{{K}^{-1}}\]        done clear
  D)
                  \[2.86\,J{{K}^{-1}}\] done clear
  View Solution play_arrow

• question_answer44)
  Which of the following endothermic processes are spontaneous              [CBSE PMT 2001]
  A)
                  Melting of ice    done clear
  B)
                  Evaporation of water done clear
  C)
                  Heat of combustion        done clear
  D)
                  Both A and B done clear
  View Solution play_arrow

• question_answer45)
  For the reaction \[{{H}_{2}}O(s)\] ⇌ \[{{H}_{2}}O(l)\] at \[{{0}^{o}}C\] and normal pressure        [KCET 2001]
  A)
                  \[\Delta H>T\Delta S\]   done clear
  B)
                  \[\Delta H=T\Delta S\] done clear
  C)
                  \[\Delta H=\Delta G\]    done clear
  D)
                  \[\Delta H<T\Delta S\] done clear
  View Solution play_arrow

• question_answer46)
  One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of \[{{27}^{o}}C\]. If the work done during the process is 3 kJ, the final temperature will be equal to \[({{C}_{v}}=20\,J{{K}^{-1}})\] [KCET 2000; AFMC 2000; AIIMS 2001]
  A)
                  150 K     done clear
  B)
                  100 K done clear
  C)
                  \[{{26.85}^{o}}C\]            done clear
  D)
                  295 K done clear
  View Solution play_arrow

• question_answer47)
  The entropy change, in the conversion of one mole of liquid water at 373 K to vapour at the same temperature is (Latent heat of vaporization of water, \[\Delta {{H}_{vap}}=2.257\,kJ/g)\] [AFMC 2002; KCET 2002]
  A)
                  105.9\[J{{k}^{-1}}\]         done clear
  B)
                  \[107.9\,\,J{{k}^{-1}}\] done clear
  C)
                  \[108.9\,\,J{{k}^{-1}}\]   done clear
  D)
                  \[109.9\,\,J{{k}^{-1}}\] done clear
  View Solution play_arrow

• question_answer48)
  A heat engine absorbs heat \[{{Q}_{1}}\] at temperature \[{{T}_{1}}\] and heat \[{{Q}_{2}}\] at temperature \[{{T}_{2}}\]. Work done by the engine is \[({{Q}_{1}}+{{Q}_{2}})\]. This data      [AIEEE 2002]
  A)
                  Violates Ist law of thermodynamics done clear
  B)
                  Violates Ist law of thermodynamics if \[{{Q}_{1}}\] is ?ve done clear
  C)
                  Violates Ist law of thermodynamics if \[{{Q}_{2}}\] is ?ve done clear
  D)
                  Does not violate Ist law of thermodynamics done clear
  View Solution play_arrow

• question_answer49)
  Equal volumes of monoatomic and diatomic gases at same initial temperature and pressure are mixed. The ratio of specific heats of the mixture \[({{C}_{p}}/{{C}_{v}})\] will be [AFMC 2002]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  1.67        done clear
  D)
                  1.5 done clear
  View Solution play_arrow

• question_answer50)
  The law formulated by Dr. Nernst is        [Kerala (Med.) 2002]
  A)
                  First law of thermodynamics done clear
  B)
                  Second law of thermodynamics done clear
  C)
                  Third law of thermodynamics done clear
  D)
                  Both A and B done clear
  View Solution play_arrow

• question_answer51)
  The unit of entropy is     [CBSE PMT 2002]
  A)
                  \[J\,mo{{l}^{-1}}\]           done clear
  B)
                  \[JK\,mo{{l}^{-1}}\] done clear
  C)
                  \[J\,mo{{l}^{-1}}{{K}^{-1}}\]        done clear
  D)
                  \[{{J}^{-1}}{{K}^{-1}}mo{{l}^{1}}\] done clear
  View Solution play_arrow

• question_answer52)
  The entropy changed involved in the conversion of 1 mole of liquid water at 373 K to vapour at the same temperature will be \[[\Delta {{H}_{\text{vap}}}=2.257kJ/gm]\]                                         [MP PET 2002]
  A)
                  0.119 kJ done clear
  B)
                  0.109 kJ done clear
  C)
                  0.129 kJ done clear
  D)
                  0.120 kJ done clear
  View Solution play_arrow

• question_answer53)
  When a liquid boils, there is        [JIPMER 2002]
  A)
                  An increase in entropy done clear
  B)
                  A decrease in entropy done clear
  C)
                  An increase in heat of vaporization done clear
  D)
                  An increase in free energy done clear
  View Solution play_arrow

• question_answer54)
  Which one of the following has \[\Delta {{S}^{o}}\] greater than zero [AIIMS 2003]
  A)
                  \[CaO+C{{O}_{2}}(g)\]⇌ \[CaC{{O}_{3}}(s)\] done clear
  B)
                  \[NaCl\,(aq)\] ⇌ \[NaCl(s)\] done clear
  C)
                  \[NaN{{O}_{3}}(s)\] ⇌ \[N{{a}^{+}}(aq)+NO_{3}^{-}(aq)\] done clear
  D)
                  \[{{N}_{2}}(g)+3{{H}_{2}}(g)\] ⇌ \[2N{{H}_{3}}(g)\] done clear
  View Solution play_arrow

• question_answer55)
  The molar heat capacity of water at constant pressure is \[75\,\,J{{K}^{-1}}mo{{l}^{-1}}\]. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand the increase in temperature of water is           [CBSE PMT 2003]
  A)
                  6.6 K      done clear
  B)
                  1.2 K done clear
  C)
                  2.4 K      done clear
  D)
                  4.8 K done clear
  View Solution play_arrow

• question_answer56)
  The work done to contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process    [MP PMT 2003]
  A)
                  + 590 joules        done clear
  B)
                  ? 334 joules done clear
  C)
                  + 334 joules        done clear
  D)
                  ? 590 joules done clear
  View Solution play_arrow

• question_answer57)
  Highest entropy is in       [BVP 2003]
  A)
                  Hydrogen            done clear
  B)
                  Water done clear
  C)
                  Graphite              done clear
  D)
                  Mercury done clear
  View Solution play_arrow

• question_answer58)
  \[\underset{{{S}^{o}}(298\,K)\,{{K}^{-1}}mo{{l}^{-1}}}{\mathop{{{H}^{+}}(aq)}}\,+\underset{-10.7}{\mathop{O{{H}^{-}}(aq)}}\,\xrightarrow{{}}\underset{+70}{\mathop{{{H}_{2}}O(l)}}\,\]                 Standard entropy change for the above reaction is  [DPMT 2004]
  A)
                  \[60.3\,J{{K}^{-1}}mo{{l}^{-1}}\]                done clear
  B)
                  \[80.7\,J{{K}^{-1}}mo{{l}^{-1}}\] done clear
  C)
                  \[-70\,J{{K}^{-1}}mo{{l}^{-1}}\]  done clear
  D)
                  \[+10.7\,J{{K}^{-1}}mo{{l}^{-1}}\] done clear
  View Solution play_arrow

• question_answer59)
  One mole of water at \[{{100}^{o}}C\] is converted into steam at \[{{100}^{o}}C\] at a constant pressure of 1 atm. The change in entropy is [heat of vaporisation of water at \[{{100}^{o}}C=540\,cal/gm\]]       [Pb. PMT 2004]
  A)
                  8.74        done clear
  B)
                  18.76 done clear
  C)
                  24.06     done clear
  D)
                  26.06 done clear
  View Solution play_arrow

• question_answer60)
  For a car not engine, the source is at \[500K\] and the sink at \[300K\]. What is efficiency of this engine [BHU 2004]
  A)
                  0.2          done clear
  B)
                  0.4 done clear
  C)
                  0.6          done clear
  D)
                  0.3 done clear
  View Solution play_arrow

• question_answer61)
  Heat require to raise the temperature of 1 mol of a substance by \[{{1}^{o}}C\] is called                [DCE 2002]
  A)
                  Specific heat      done clear
  B)
                  Molar heat capacity done clear
  C)
                  Water equivalent             done clear
  D)
                  Specific gravity done clear
  View Solution play_arrow

• question_answer62)
  Maximum entropy will be in which of the following [DCE 2004]
  A)
                  Ice          done clear
  B)
                  Liquid water done clear
  C)
                  Snow     done clear
  D)
                  Water vapours done clear
  View Solution play_arrow

• question_answer63)
  The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.740 and 205 \[J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}\] is        [Pb. CET 2001]
  A)
                  \[2.76\,J{{K}^{-1}}\]        done clear
  B)
                  \[2.12\,J{{K}^{-1}}\] done clear
  C)
                  \[1.12\,J{{K}^{-1}}\]        done clear
  D)
                  \[1.40\,J{{K}^{-1}}\] done clear
  View Solution play_arrow

• question_answer64)
  Which law of thermodyanamics help in calculating entropy at different temperatures     [Pb. CET 2003]
  A)
                  First law               done clear
  B)
                  Second law done clear
  C)
                  Third law              done clear
  D)
                  Zeroth law done clear
  View Solution play_arrow

• question_answer65)
  Entropy is maximum in case of   [BVP 2004]
  A)
                  Steam   done clear
  B)
                  Water at \[{{0}^{o}}C\] done clear
  C)
                  Water at \[{{4}^{o}}C\]  done clear
  D)
                  Ice done clear
  View Solution play_arrow

• question_answer66)
  Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is [CBSE PMT 2004]
  A)
                  \[\Delta {{S}_{system}}>0\] only done clear
  B)
                  \[\Delta {{S}_{surroundings}}>0\] only done clear
  C)
                  \[\Delta {{S}_{system}}+\Delta {{S}_{surroundings}}>0\] done clear
  D)
                  \[\Delta {{S}_{system}}-\Delta {{S}_{surroundings}}>0\] done clear
  View Solution play_arrow

• question_answer67)
  A process is taking place at constant temperature and pressure. Then    [KCET 2004]
  A)
                  \[\Delta H=\Delta E\]     done clear
  B)
                  \[\Delta H=T\Delta S\] done clear
  C)
                  \[\Delta H=0\]   done clear
  D)
                  \[\Delta S=0\] done clear
  View Solution play_arrow

• question_answer68)
  The enthalpy of vapourization of a liquid is \[30\,kJ\,mo{{l}^{-1}}\] and entropy of vapourization is \[75\,J\,mo{{l}^{-1}}K\]. The boiling point of the liquid at 1 atm is                 [IIT JEE (Screening) 2004]
  A)
                  250K      done clear
  B)
                  400K done clear
  C)
                  450K      done clear
  D)
                  600K done clear
  View Solution play_arrow