JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank

done First law of thermodynamics and Hess law Total Questions - 58

• question_answer1)
  The first law of thermodynamics is only
  A)
                  The law of conservation of energy done clear
  B)
                  The law of conservation of mass done clear
  C)
                  The law of conservation of momentum done clear
  D)
                  Both A and B done clear
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• question_answer2)
  A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If \[\Delta H\] is the enthalpy change and \[\Delta E\] is the change in internal energy, then      [KCET 2005]
  A)
                  \[\Delta H>\Delta E\]     done clear
  B)
                  \[\Delta H<\Delta E\] done clear
  C)
                  \[\Delta H=\Delta E\] done clear
  D)
                  The relationship depends on the capacity of the vessel done clear
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• question_answer3)
  Which of the following is always negative for exothermic reaction?          [BCECE 2005]
  A)
                  DH          done clear
  B)
                  DS done clear
  C)
                  DG          done clear
  D)
                  None of these done clear
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• question_answer4)
  The relation between \[\Delta E\] and \[\Delta H\] is [MP PET 1992; MP PMT 1996; MP PET/PMT 1998]
  A)
                  \[\Delta H=\Delta E-P\,\Delta V\]             done clear
  B)
                  \[\Delta H=\Delta E+P\,\Delta V\] done clear
  C)
                  \[\Delta E=\Delta V+\Delta H\] done clear
  D)
                  \[\Delta E=\Delta H+P\,\Delta V\] done clear
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• question_answer5)
  At constant T and P, which one of the following statements is correct for the reaction, \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\to C{{O}_{2}}(g)\]                 [AIIMS 1982, 83; KCET 1988; BHU 1995; MP PET 1997, 99]
  A)
                  \[\Delta H\] is independent of the physical state of the reactants of that compound done clear
  B)
                  \[\Delta H\,>\,\Delta E\] done clear
  C)
                  \[\Delta H\,<\,\Delta E\] done clear
  D)
                  \[\Delta H=\Delta E\] done clear
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• question_answer6)
  For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, \[\Delta \text{U}\] and w correspond to      [AIIMS 2005]
  A)
                  \[\Delta \text{U}<0,\ w=0\]        done clear
  B)
                  \[\Delta \text{U}=0,\ w<0\] done clear
  C)
                  \[\Delta \text{U}>0,\ w=0\]        done clear
  D)
                  \[\Delta \text{U}<0,\ w>0\] done clear
  View Solution play_arrow

• question_answer7)
  Which is not the correct relation between enthalpy \[(\Delta H)\]and intrinsic energy \[(\Delta E)\]         [EAMCET 1992]
  A)
                  \[\Delta H=\Delta E+\,P\,\Delta V\] done clear
  B)
                  \[\Delta H\,=\,\Delta E\,+\,n\,RT\] done clear
  C)
                  \[\Delta H=\Delta E\,-\,P\,\Delta V\] done clear
  D)
                  \[\Delta E=\Delta H\,-\,P\,\Delta V\] done clear
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• question_answer8)
  The law of Lavoisier and Laplace illustrates [KCET 1989]
  A)
                  The principle of conservation of energy done clear
  B)
                  Equivalence of mechanical and thermal energy done clear
  C)
                  The principle of conservation of matter done clear
  D)
                  Equivalence of mechanical and chemical energy done clear
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• question_answer9)
  For the reaction \[{{N}_{2}}+3{{H}_{2}}\]⇌\[2N{{H}_{3}};\,\Delta H=\] [Roorkee 2000; CBSE PMT 1991, 2002]
  A)
                  \[\Delta E-RT\] done clear
  B)
                  \[\Delta E-2RT\] done clear
  C)
                  \[\Delta E+RT\]                 done clear
  D)
                  \[\Delta E+2RT\] done clear
  View Solution play_arrow

• question_answer10)
  If \[\Delta H\] is the change in enthalpy and \[\Delta E\] the change in internal energy accompanying a gaseous reaction KCET 1989; CBSE PMT 1990]
  A)
                  \[\Delta H\] is always greater than \[\Delta E\] done clear
  B)
                  \[\Delta H<\Delta E\] only if the number of moles of the products is greater than the number of the reactants done clear
  C)
                  \[\Delta H\] is always less than \[\Delta E\] done clear
  D)
                  \[\Delta H<\Delta E\] only if the number of moles of the products is less than the number of moles of the reactants done clear
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• question_answer11)
  ?The resultant heat change in a reaction is the same whether it takes place in one or several stages.? This statement is called [MP PMT/PET 1988; MP PMT 1989]
  A)
                  Lavoisier and Laplace law done clear
  B)
                  Hess's law done clear
  C)
                  Joule's law done clear
  D)
                  Le?chatelier's principle done clear
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• question_answer12)
  Hess's law of constant heat summation in based on [MP PET 2001]
  A)
                  \[E=m{{c}^{2}}\] done clear
  B)
                  Conservation of mass done clear
  C)
                  First law of thermodynamics done clear
  D)
                  None of the above done clear
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• question_answer13)
  Consider the reaction : \[{{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}\] carried out at constant temperature and pressure. If \[\Delta H\] and \[\Delta U\] are the enthalpy and internal energy changes for the reaction, which of the following expression is true            [AIEEE 2005]
  A)
                  \[\Delta H=0\]   done clear
  B)
                  \[\Delta H=\Delta U\] done clear
  C)
                  \[\Delta H<\Delta U\]    done clear
  D)
                  \[\Delta H>\Delta U\] done clear
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• question_answer14)
  Which of the following is the correct equation [CBSE PMT 1996]
  A)
                  \[\Delta U=\Delta Q-W\]              done clear
  B)
                  \[\Delta W=\Delta U+\Delta Q\] done clear
  C)
                  \[\Delta U=\Delta W+\Delta Q\]               done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer15)
  Hess law is applicable for the determination of heat of [AIIMS 1998; Pb. PET/PMT 1999]
  A)
                  Reaction              done clear
  B)
                  Formation done clear
  C)
                  Transition            done clear
  D)
                  All of these done clear
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• question_answer16)
  Enthalpy for the reaction \[C+{{O}_{2}}\to C{{O}_{2}}\] is [DPMT 1987, 91]
  A)
                  Positive                done clear
  B)
                  Negative done clear
  C)
                  Zero       done clear
  D)
                  None done clear
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• question_answer17)
  During an isothermal expansion of an ideal gas its [CBSE PMT 1991]
  A)
                  Internal energy increases done clear
  B)
                  Enthalpy decreases done clear
  C)
                  Enthalpy remains unaffected done clear
  D)
                  Enthalpy reduces to zero done clear
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• question_answer18)
  The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at \[{{25}^{o}}C\] is         [CMC Vellore 1991]
  A)
                  \[2.303\times 298\times 0.082\,\log \,2\] done clear
  B)
                  \[298\times {{10}^{7}}\times 8.31\times 2.303\,\log \,2\] done clear
  C)
                  \[2.303\times 298\times 0.082\,\log \,0.5\] done clear
  D)
                  \[8.31\times {{10}^{7}}\times 298-2.303\,\log \,0.5\] done clear
  E)
                  \[2.303\times 298\times 2\,\log \,2\] done clear
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• question_answer19)
  The law of conservation of energy states that [NCERT 1984]
  A)
                  The internal energy of a system is constant done clear
  B)
                  The heat content of a system is constant done clear
  C)
                  Energy is neither created nor destroyed done clear
  D)
                  There is an equivalence between energy and mass done clear
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• question_answer20)
  The enthalpies of the elements in their standard states are assumed to be
  A)
                  Zero at 298 K done clear
  B)
                  Unit at 298 K done clear
  C)
                  Zero at all temperatures done clear
  D)
                  Zero at 273 K done clear
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• question_answer21)
  The heat \[Q\] for a reaction at constant volume is equal to
  A)
                  \[{{H}_{P}}-{{H}_{R}}\]  done clear
  B)
                  \[{{H}_{R}}-{{H}_{P}}\] done clear
  C)
                  \[{{E}_{P}}-{{E}_{R}}\]    done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer22)
  Which of the following expressions represents the first  law of thermodynamics [MP PET 1996, 2000; AFMC 1997; BHU 1999; AMU 2000; KCET (Med.) 2000, 01; CBSE PMT 2000; MP PMT 2002]
  A)
                  \[\Delta E=-q+W\]           done clear
  B)
                  \[\Delta E=q-W\] done clear
  C)
                  \[\Delta E=q+W\]            done clear
  D)
                  \[\Delta E=-q-W\] done clear
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• question_answer23)
  In a reversible isothermal process, the change in internal energy is
  A)
                  Zero       done clear
  B)
                  Positive done clear
  C)
                  Negative              done clear
  D)
                  None of these done clear
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• question_answer24)
  A schematic plot of \[\ln {{K}_{eq}}\]versus inverse of temperature for a reaction is shown below The reaction must be     [AIEEE 2005]
  A)
                  Exothermic done clear
  B)
                  Endothermic done clear
  C)
                  One with negligible enthalpy change done clear
  D)
                  Highly spontaneous at ordinary temperature done clear
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• question_answer25)
  Hess law of heat summation includes     [AFMC 1992]
  A)
                  Initial reactants only done clear
  B)
                  Initial reactants and final products done clear
  C)
                  Final products only done clear
  D)
                  Intermediates only done clear
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• question_answer26)
  An ideal gas at constant temperature and pressure expands, then its     [BHU 1998]
  A)
                  Internal energy remains same done clear
  B)
                  Internal energy decreases done clear
  C)
                  Internal energy increases done clear
  D)
                  Entropy first increases and then decreases done clear
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• question_answer27)
  The internal energy of a substance [KCET 1998; AFMC 2001; AIIMS 2001]
  A)
                  Increases with increase in temperature done clear
  B)
                  Decreases with increase in temperature done clear
  C)
                  Can be calculated by the relation \[E=m{{c}^{2}}\] done clear
  D)
                  Remains unaffected with change in temperature done clear
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• question_answer28)
  The relation between change in internal energy \[(\Delta E)\], change in enthalpy \[(\Delta H)\] and work done (W) is represented as                 [AFMC 1999]
  A)
                  \[\Delta H=\Delta E+W\]              done clear
  B)
                  \[W=\Delta E-\Delta H\] done clear
  C)
                  \[\Delta E=W-\Delta H\]               done clear
  D)
                  \[\Delta E=\Delta H+W\] done clear
  View Solution play_arrow

• question_answer29)
  The enthalpy of neutralization of which of the following acids and bases is nearly \[-13.6\,Kcal\]                [Roorkee 1999]
  A)
                  HCN and NaOH done clear
  B)
                  HCl and KOH done clear
  C)
                  HCl and NaOH   done clear
  D)
                  HCl and NH4OH done clear
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• question_answer30)
  Work done during isothermal expansion of one mole of an ideal gas from 10 atm to 1 atm at 300 K is (Gas constant = 2)            [AIIMS 2000]
  A)
                  938.8 cal.             done clear
  B)
                  1138.8 cal. done clear
  C)
                  1381.8 cal.           done clear
  D)
                  1581.8 cal. done clear
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• question_answer31)
  Joule-Thomson expansion is       [JIPMER 2000]
  A)
                  Isobaric done clear
  B)
                  Isoenthalpic done clear
  C)
                  Isothermal          done clear
  D)
                  None of these done clear
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• question_answer32)
  In which of the following \[\Delta E=\Delta H\]  [MP PMT 2001]
  A)
                  \[{{N}_{2}}{{O}_{4}}(g)\] ⇌ \[2N{{O}_{2}}(g)\] done clear
  B)
                  \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\] ⇌ \[2S{{O}_{3}}(g)\] done clear
  C)
                  \[{{H}_{2}}(g)+{{I}_{2}}(g)\] ⇌ \[2HI(g)\] done clear
  D)
                  \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\] ⇌ \[{{H}_{2}}O(l)\] done clear
  View Solution play_arrow

• question_answer33)
  In an adiabatic expansion of an ideal gas [KCET (Med.) 2001; MH CET 2000]
  A)
                  \[W=-\Delta E\]                done clear
  B)
                  \[W=\Delta E\] done clear
  C)
                  \[\Delta E=0\]    done clear
  D)
                  \[W=0\] done clear
  View Solution play_arrow

• question_answer34)
  For the reaction \[C{{H}_{3}}COOH(l)+2{{O}_{2}}(g)\] ⇌ \[2C{{O}_{2}}(g)+2{{H}_{2}}O(l)\] at \[{{25}^{o}}C\] and 1 atm. pressure, \[\Delta H=-874\,kJ.\] Then the change in internal energy \[(\Delta E)\] is ?.       [Orissa JEE 2002]
  A)
                  ? 874 kJ done clear
  B)
                  ? 871.53 kJ done clear
  C)
                  ? 876.47 kJ          done clear
  D)
                  + 874 kJ done clear
  View Solution play_arrow

• question_answer35)
  In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true        [CBSE PMT 2002]
  A)
                  \[\Delta E=W=Q=0\]       done clear
  B)
                  \[\Delta E\ne 0,\,Q=W=0\] done clear
  C)
                  \[\Delta E=W\ne 0,\,Q=0\]          done clear
  D)
                  \[\Delta E=Q\ne 0,\,W=0\] done clear
  View Solution play_arrow

• question_answer36)
  Hess law is based on       [MH CET 2002]
  A)
                  Law of conservation of mass done clear
  B)
                  Law of conservation of energy done clear
  C)
                  Enthalpy is a state function done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer37)
  For the reaction, \[{{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\to \,\,3C{{O}_{2}}(g)+4{{H}_{2}}O(l)\] at constant temperature, \[\Delta H-\Delta E\] is              [CBSE PMT 2003]
  A)
                  ? RT       done clear
  B)
                  + RT done clear
  C)
                  ? 3RT     done clear
  D)
                  + 3RT done clear
  View Solution play_arrow

• question_answer38)
  According to Hess?s law, the heat of reaction depends upon [MP PMT 2003]
  A)
                  Initial condition of reactants done clear
  B)
                  Initial and final conditions of reactants done clear
  C)
                  Intermediate path of the reaction done clear
  D)
                  End conditions of reactants done clear
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• question_answer39)
  The value of \[\Delta H-\Delta E\] for the following reaction at \[{{27}^{o}}C\] will be \[2N{{H}_{3}}(g)\,\to \,{{N}_{2}}(g)+3{{H}_{2}}(g)\]    [Kerala (Med.) 2002]
  A)
                  \[8.314\times 273\times (-2)\]   done clear
  B)
                  \[8.314\times 300\times (-2)\] done clear
  C)
                  \[8.314\times 27\times (-2)\]     done clear
  D)
                  \[8.314\times 300\times (2)\] done clear
  View Solution play_arrow

• question_answer40)
  For which of the following \[\Delta E=\Delta H\]                [MP PET 2003]
  A)
                  \[{{N}_{2}}{{O}_{4}}(g)\] ⇌ \[2N{{O}_{2}}(g)\] done clear
  B)
                  \[2S{{O}_{2}}(g)+{{O}_{2}}(g)\] ⇌ \[2S{{O}_{3}}(g)\] done clear
  C)
                  \[{{H}_{2}}(g)+C{{l}_{2}}(g)\] ⇌ \[2HCl(g)\] done clear
  D)
                  \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\] ⇌ \[{{H}_{2}}O(l)\] done clear
  View Solution play_arrow

• question_answer41)
  One mole of an ideal gas is allowed to expand freely and adiabatically into vacuum until its volume has doubled. A statement which is not true concerning this expression is [Pb. PMT 1998]
  A)
                  \[\Delta H=0\]   done clear
  B)
                  \[\Delta S=0\] done clear
  C)
                  \[\Delta E=0\]    done clear
  D)
                  \[W=0\] done clear
  View Solution play_arrow

• question_answer42)
  At \[{{27}^{o}}C,\] one mole of an ideal gas is compressed isothermally and reversibly from a pressure of 2 atm to 10 atm. The values of \[\Delta E\] and q are \[(R=2)\]           [BHU 2001]
  A)
                  0, ? 965.84 cal done clear
  B)
                  ? 965.84 cal, + 965.84 cal done clear
  C)
                  + 865.58 cal, ? 865.58 cal done clear
  D)
                  ? 865.58 cal, ? 865.58 cal done clear
  View Solution play_arrow

• question_answer43)
  The work done by a system is 8 joule, when 40 joule heat is supplied to it. What is the increase in internal energy of system [BHU 2001]
  A)
                  25 J         done clear
  B)
                  30 J done clear
  C)
                  32 J         done clear
  D)
                  28 J done clear
  View Solution play_arrow

• question_answer44)
  A system absorb 600J of heat and work equivalent to 300J on its surroundings. The change in internal energy is [Pb. PMT 2004]
  A)
                  300 J      done clear
  B)
                  400 J done clear
  C)
                  500 J      done clear
  D)
                  600 J done clear
  View Solution play_arrow

• question_answer45)
  Work done during isothermal expansion of one mole of an ideal gas from 10 atom. to 1 atm at 300K is    [BHU 2004]
  A)
                  4938.8 J done clear
  B)
                  4138.8 J done clear
  C)
                  5744.1 J done clear
  D)
                  6257.2 J done clear
  View Solution play_arrow

• question_answer46)
  If gas, at constant temperature and pressure expands then its [MH CET 2003]
  A)
                  Entropy increases and then decreases done clear
  B)
                  Internal energy increases done clear
  C)
                  Internal energy remains the same done clear
  D)
                  Internal energy decreases done clear
  View Solution play_arrow

• question_answer47)
  For the reaction                 \[PC{{l}_{5}}(g)\to PC{{l}_{3}}(g)+C{{l}_{2}}(g)\]                [MH CET 2004]
  A)
                  \[\Delta H=\Delta E\]     done clear
  B)
                  \[\Delta H>\Delta E\] done clear
  C)
                  \[\Delta H<\Delta E\]     done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer48)
  Enthalpy \[(H)\] is equal to          [MH CET  2004]
  A)
                  Internal energy E done clear
  B)
                  Product of pressure (P) and volume (V) of gas done clear
  C)
                  Internal energy E+PV done clear
  D)
                  Work (W) done by a system done clear
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• question_answer49)
  \[\Delta {{E}^{o}}\] of combustion of isobutylene is \[-X\,kJ\,mo{{l}^{-1}}\]. The value of \[\Delta {{H}^{o}}\] is                  [DCE 2004]
  A)
                  \[=\Delta {{E}^{o}}\]       done clear
  B)
                  \[>\Delta {{E}^{o}}\] done clear
  C)
                  \[=0\]    done clear
  D)
                  \[<\Delta {{E}^{o}}\] done clear
  View Solution play_arrow

• question_answer50)
  One mole of an ideal gas is allowed to expand reversibly and adibatically from a temperature of \[{{27}^{o}}C\]. If the work done during the process is \[3\,kJ\], then final temperature of the gas is \[({{C}_{V}}=20\,J/K)\]    [Pb. CET 2002]
  A)
                  100 K     done clear
  B)
                  150 K done clear
  C)
                  195 K     done clear
  D)
                  255 K done clear
  View Solution play_arrow

• question_answer51)
  Which of the following is correct regarding the internal energy of a substance    [Pb. CET 2002]
  A)
                  It is a state function done clear
  B)
                  It increases with increase in temperature done clear
  C)
                  It can be calculated by experiment done clear
  D)
                  It remains unaffected with change in temperature done clear
  View Solution play_arrow

• question_answer52)
  For the gaseous reaction,                 \[{{N}_{2}}{{O}_{4}}\to 2N{{O}_{2}}\]     [Pb. CET 2003]
  A)
                  \[\Delta H<\Delta E\]     done clear
  B)
                  \[\Delta H=\Delta E\] done clear
  C)
                  \[\Delta H=0\]   done clear
  D)
                  \[\Delta H>\Delta E\] done clear
  View Solution play_arrow

• question_answer53)
  \[2C+{{O}_{2}}\to 2CO;\,\,\Delta H=-220\,kJ\] Which of the following statement is correct for this reaction [BVP 2004]
  A)
                  Heat of combustion of carbon is 110 kJ done clear
  B)
                  Reaction is exothermic done clear
  C)
                  Reaction needs no initiation done clear
  D)
                  All of these are correct done clear
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• question_answer54)
  An ideal gas expands in volume from \[1\times {{10}^{-3}}{{m}^{3}}\] to \[1\times {{10}^{-2}}{{m}^{3}}\] at 300 K against a constant pressure of \[1\times {{10}^{5}}N{{m}^{-2}}\]. The work done is          [AIEEE 2004]
  A)
                  270 kJ    done clear
  B)
                  ?900 kJ done clear
  C)
                  ?900 J    done clear
  D)
                  900 kJ done clear
  View Solution play_arrow

• question_answer55)
  Internal energy is             [AFMC 2004]
  A)
                  Partly potential and partly kinetic done clear
  B)
                  Totally kinetic done clear
  C)
                  Totally potential done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer56)
  For which of the reaction \[\Delta H=\Delta E\]                  [MP PET 2004]
  A)
                  \[{{N}_{2}}+3{{H}_{2}}\]⇌\[2N{{H}_{3}}\]       done clear
  B)
                  \[{{N}_{2}}+{{O}_{2}}\to 2NO\] done clear
  C)
                  \[2Na+C{{l}_{2}}\to 2NaCl\]        done clear
  D)
                  \[PC{{l}_{5}}\to PC{{l}_{3}}+C{{l}_{2}}\] done clear
  View Solution play_arrow

• question_answer57)
  The work done during the expansion of a gas from a volume of \[4d{{m}^{3}}\] to \[6d{{m}^{3}}\] against a constant external pressure of \[3atm\] is (\[1L\,atm\,=101.32\,J\])             [CBSE PMT 2004]
  A)
                  + 304 J   done clear
  B)
                  ?304 J done clear
  C)
                  ? 6 J       done clear
  D)
                  ?608 J done clear
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• question_answer58)
  For the reaction, \[{{A}_{(s)}}+2{{B}_{(g)}}\to 4{{C}_{(s)}}+{{D}_{(l)}}\]. \[\Delta H\] and \[\Delta U\] are related as ???      [Orissa JEE 2004]
  A)
                  \[\Delta H=\Delta U\]    done clear
  B)
                  \[\Delta H=\Delta U+3RT\] done clear
  C)
                  \[\Delta H=\Delta U+RT\]             done clear
  D)
                  \[\Delta H=\Delta U-3RT\] done clear
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