11th Class Physics Thermodynamical Processes Question Bank

done Critical Thinking Total Questions - 52

• question_answer1)
  Adsorption of gases on solid surface is generally exothermic because     [IIT JEE (Screening) 2004]
  A)
                  Enthalpy is positive         done clear
  B)
                  Entropy decreases done clear
  C)
                  Entropy increases            done clear
  D)
                  Free energy increase done clear
  View Solution play_arrow

• question_answer2)
  Two mole of an ideal gas is expanded isothermally and reversibly from 1 litre ot 10 litre at \[300K\]. The enthalpy change (in \[kJ\]) for the process is [IIT JEE (Screening) 2004]
  A)
                  11.4 kJ   done clear
  B)
                  ?11.4 kJ done clear
  C)
                  0 kJ         done clear
  D)
                  4.8 kJ done clear
  View Solution play_arrow

• question_answer3)
  Heat of neutralization of strong acid against strong base is constant and is equal to [EAMCET 1980; AFMC 1989; DPMT 1991; MP PET 1999; BHU 1999; MP PMT 1995]
  A)
                  13.7 kcal               done clear
  B)
                  57 kJ done clear
  C)
                  \[5.7\times {{10}^{4}}\] J              done clear
  D)
                  All of the above done clear
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• question_answer4)
  The value of heat generated when 36.5 gm \[HCl\] and 40 gm of \[NaOH\] reacts during neutralization [NCERT 1984; CPMT 1993]
  A)
                  76.5 kcal               done clear
  B)
                  13.7 kcal done clear
  C)
                  More than 13.7 kcal        done clear
  D)
                  108 kcal done clear
  View Solution play_arrow

• question_answer5)
  When a gas undergoes adiabatic expansion, it gets cooled due to             [DCE 2002]
  A)
                  Loos of kinetic energy done clear
  B)
                  Fall in temperature done clear
  C)
                  Decrease in velocity done clear
  D)
                  Energy used in doing work done clear
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• question_answer6)
  The heat content of a system is called
  A)
                  Internal energy done clear
  B)
                  Entropy done clear
  C)
                  Free energy       done clear
  D)
                  Enthalpy done clear
  View Solution play_arrow

• question_answer7)
  To calculate the amount of work done in joules during reversible isothermal expansion of an ideal gas, the volume must be expressed in    [KCET (Med.) 2001]
  A)
                  \[{{m}^{3}}\] only            done clear
  B)
                  \[d{{m}^{3}}\] only done clear
  C)
                  \[c{{m}^{3}}\] only          done clear
  D)
                  Any one of them done clear
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• question_answer8)
  In an isobaric process, the ratio of heat supplied to the system \[(dQ)\] and work done by the system \[(dW)\] for diatomic gas is                 [AFMC 2002]
  A)
                  1 : 1        done clear
  B)
                  7 : 2 done clear
  C)
                  7 : 5        done clear
  D)
                  5 : 7 done clear
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• question_answer9)
  The enthalpy change for the reaction of 50.00 ml of ethylene with 50.00 ml of \[{{H}_{2}}\] at 1.5 atm pressure is \[\Delta H=-0.31\,kJ\]. The value of \[\Delta E\] will be  [DPMT 2004]
  A)
                  ?0.3024 kJ           done clear
  B)
                  0.3024 kJ done clear
  C)
                  2.567 kJ done clear
  D)
                  ?0.0076 kJ done clear
  View Solution play_arrow

• question_answer10)
  Enthalpy of solution of \[NaOH\] (solid) in water is \[-41.6\,kJ\,mo{{l}^{-1}}\]. When \[NaOH\] is dissolved in water, the temperature of water           [UPSEAT  2004]
  A)
                  Increase               done clear
  B)
                  Decreases done clear
  C)
                  Does not change              done clear
  D)
                  Fluctuates indefinitely done clear
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• question_answer11)
  In which of the following entropy decreases ? [CPMT 1988, 94; MP PMT 2000]
  A)
                  Crystallization of sucrose from solution done clear
  B)
                  Rusting of iron done clear
  C)
                  Melting of ice done clear
  D)
                  Vaporization of camphor done clear
  View Solution play_arrow

• question_answer12)
  For conversion C (graphite) ® C (diamond) the \[\Delta S\] is [MP PMT 2001; MP PET 2003]
  A)
                  Zero       done clear
  B)
                  Positive done clear
  C)
                  Negative              done clear
  D)
                  Unknown done clear
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• question_answer13)
  For a reaction \[\Delta H=9.08\,kJ\,mo{{l}^{-1}}\] and \[\Delta S=35.7\,J{{K}^{-1}}mo{{l}^{-1}}\] Which of the following statements is correct for the reaction [AMU (Engg.) 2000]
  A)
                  Reversible and Isothermal done clear
  B)
                  Reversible and Exothermic done clear
  C)
                  Spontaneous and Endothermic done clear
  D)
                  Spontaneous and Exothermic done clear
  View Solution play_arrow

• question_answer14)
  For a reaction to occur spontaneously    [CBSE PMT 1995]
  A)
                  \[(\Delta H-T\Delta S)\] must be negative done clear
  B)
                  \[(\Delta H+T\Delta S)\] must be negative done clear
  C)
                  \[\Delta H\] must be negative done clear
  D)
                  \[\Delta S\] must be negative done clear
  View Solution play_arrow

• question_answer15)
  The total amount of energy in the universe is fixed, but [AMU (Engg.) 1999]
  A)
                  Disorder is increasing     done clear
  B)
                  Lightning is increasing done clear
  C)
                  Matter is increasing        done clear
  D)
                  Gravitation is decreasing done clear
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• question_answer16)
  If for a given substance melting point is \[{{T}_{B}}\] and freezing point is \[{{T}_{A}}\], then correct variation shown by graph between entropy change and temperature is [DCE 2001]
  A)
                   done clear
  B)
    done clear
  C)
    done clear
  D)
      done clear
  View Solution play_arrow

• question_answer17)
  In endothermic reaction, the value of change in enthalpy \[(\Delta H)\] is [Pb. CET 2001]
  A)
                  Positive                done clear
  B)
                  Negative done clear
  C)
                  Zero       done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer18)
  Which of the following would be expected to have the largest antropy per mole               [MP PMT 2004]
  A)
                  \[S{{O}_{2}}C{{l}_{2}}(s)\]            done clear
  B)
                  \[S{{O}_{2}}C{{l}_{2}}(g)\] done clear
  C)
                  \[S{{O}_{2}}C{{l}_{2}}(l)\]             done clear
  D)
                  \[S{{O}_{2}}(g)\] done clear
  View Solution play_arrow

• question_answer19)
  The enthalpies of formation of \[A{{l}_{2}}{{O}_{3}}\] and \[C{{r}_{2}}{{O}_{3}}\] are \[-1596\,kJ\] and \[-1134\,kJ\] respectively. \[\Delta H\] for the reaction \[2Al+C{{r}_{2}}{{O}_{3}}\to 2Cr+A{{l}_{2}}{{O}_{3}}\] is           [KCET 2003]
  A)
                  \[-2730\,kJ\]      done clear
  B)
                  \[-462\,kJ\] done clear
  C)
                  \[-1365\,kJ\]      done clear
  D)
                  \[+\,2730\,kJ\] done clear
  View Solution play_arrow

• question_answer20)
  Heat of reaction at constant volume is measured in the apparatus
  A)
                  Bomb calorimeter            done clear
  B)
                  Calorimeter done clear
  C)
                  Pyknometer       done clear
  D)
                  Pyrometer done clear
  View Solution play_arrow

• question_answer21)
  Which of the following gas has the highest heat of combustion
  A)
                  Methane             done clear
  B)
                  Ethane done clear
  C)
                  Ethylene done clear
  D)
                              Acetylene done clear
  View Solution play_arrow

• question_answer22)
  The amount of heat measured for a reaction in a bomb calorimeter is     [AIIMS 1991]
  A)
                  \[\Delta G\]        done clear
  B)
                  \[\Delta H\] done clear
  C)
                  \[\Delta E\]         done clear
  D)
                  \[P\Delta V\] done clear
  View Solution play_arrow

• question_answer23)
  For an endothermic reaction where \[\Delta H\] represents the enthalpy of the reaction in kJ/mole, the minimum value for the energy of activation will be [IIT JEE 1992; MP PET 1993]
  A)
                  Less than \[\Delta H\]    done clear
  B)
                  Zero done clear
  C)
                  More than \[\Delta H\] done clear
  D)
                  Equal to \[\Delta H\] done clear
  View Solution play_arrow

• question_answer24)
  The heat of neutralization of a strong acid by a strong base is nearly equal to       [MP PET 1993; BCECE 2005]
  A)
                  + 57.32 J               done clear
  B)
                  ?  57.32 kJ done clear
  C)
                  + 13.7 J done clear
  D)
                  ? 13.7 kJ done clear
  View Solution play_arrow

• question_answer25)
  A Beckmann thermometer is used to measure [Kurukshetra CEE 2002]
  A)
                  High temperature            done clear
  B)
                  Low temperature done clear
  C)
                  Normal temperature      done clear
  D)
                  All temperature done clear
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• question_answer26)
  The heat required to raise the temperature of a body by 1 K is called      [AIEEE 2002]
  A)
                  Specific heat      done clear
  B)
                  Thermal capacity done clear
  C)
                  Water equivalent             done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer27)
  Mechanical work is specially important in system that contain     [Kerala (Med.) 2002]
  A)
                  Solid-liquid          done clear
  B)
                  Liquid-liquid done clear
  C)
                  Solid-solid           done clear
  D)
                  Amalgam done clear
  E)
                  Gases done clear
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• question_answer28)
  ?The quantity of heat which must be supplied to decompose a compound into its element is equal to the heat evolved during the formation of that compound from the elements.? This statement is known as
  A)
                  Hess's law done clear
  B)
                  Joule's law done clear
  C)
                  Le?chatelier's principle done clear
  D)
                  Lavoiser and Laplace law done clear
  View Solution play_arrow

• question_answer29)
  Hess law deals with         [BHU 1979]
  A)
                  Changes in heat of reaction done clear
  B)
                  Rate of reaction done clear
  C)
                  Equilibrium constant done clear
  D)
                  Influence of pressure on volume of a gas done clear
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• question_answer30)
  For which one of the following reactions, \[\Delta H\] is not equal to \[\Delta E\]              [IIT JEE 1995]
  A)
                  \[{{H}_{2(g)}}+{{I}_{2(g)}}\]⇌ \[2H{{I}_{(g)}}\] done clear
  B)
                  \[{{C}_{(s)}}+{{O}_{2(g)}}\]⇌\[C{{O}_{2(g)}}\] done clear
  C)
                  \[{{N}_{2(g)}}+3{{H}_{2(g)}}\]⇌\[2N{{H}_{3(g)}}\] done clear
  D)
                  \[HC{{l}_{(aq)}}+NaO{{H}_{(aq)}}\]⇌\[NaC{{l}_{(aq)}}+{{H}_{2}}O\] done clear
  View Solution play_arrow

• question_answer31)
  The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at \[{{25}^{o}}C\] increases the temperature of 18.94 kg of water by \[{{0.632}^{o}}C\].If the specific heat of water at \[{{25}^{o}}C\] is 0.998 cal/g-deg, the value of the heat combustion of benzoic acid is               [CPMT 1999; BHU 2000]
  A)
                  771.1 kcal            done clear
  B)
                  871.2 kcal done clear
  C)
                  881.1 kcal done clear
  D)
                  981.1 kcal done clear
  View Solution play_arrow

• question_answer32)
  For a hypothetic reaction \[A\to B\], the activation energies for forward and backward reactions are 19 kJ/mole and 9 kJ/mole respectively. The heat of reaction is [CBSE PMT 2000]
  A)
                  28 kJ      done clear
  B)
                  19 kJ done clear
  C)
                  10 kJ      done clear
  D)
                  9 kJ done clear
  View Solution play_arrow

• question_answer33)
  The enthalpy of neutralization of \[HCN\] by \[NaOH\] is \[-12.13\,kJ\,mo{{l}^{-1}}\]. The enthalpy of ionisation of \[HCN\] will be [BHU 1997]
  A)
                  4.519 kJ done clear
  B)
                  45.10 kJ done clear
  C)
                  451.9 kJ done clear
  D)
                  45.19 kJ done clear
  View Solution play_arrow

• question_answer34)
  In thermodynamics, a process is called reversible when [AIIMS 2001]
  A)
                  Surroundings and system change into each other done clear
  B)
                  There is no boundary between system and surroundings done clear
  C)
                  The surroundings are always in equilibrium with the system done clear
  D)
                  The system changes into the surroundings spontaneously done clear
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• question_answer35)
  Which of the following unit represents largest amount of energy              [AMU 2001]
  A)
                  Calorie  done clear
  B)
                  Joule done clear
  C)
                  Erg         done clear
  D)
                  Electron volt done clear
  View Solution play_arrow

• question_answer36)
  Which of the following will have the highest bond energy [MP PMT 1990]
  A)
                  \[{{F}_{2}}\]       done clear
  B)
                  \[C{{l}_{2}}\] done clear
  C)
                  \[B{{r}_{2}}\]     done clear
  D)
                  \[{{I}_{2}}\] done clear
  View Solution play_arrow

• question_answer37)
  \[{{C}_{\text{(graphite)}}}+{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\]                 \[\Delta H=-94.05\,kcal\,mo{{l}^{-1}}\] \[{{C}_{\text{(diamond)}}}+{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g);\,\]\[\Delta H=-94.50\,kcal\,mo{{l}^{-1}}\] therefore                                            [DPMT 2001]
  A)
                  \[{{C}_{\text{(graphite)}}}\,\to \,{{C}_{\text{(diamond)}}}\]; \[\Delta H_{298K}^{o}=-450\,cal\,mo{{l}^{-1}}\] done clear
  B)
                  \[{{C}_{\text{(diamond)}}}\,\to \,{{C}_{\text{(graphite)}}};\] \[\Delta H_{298K}^{o}=+450\,cal\,mo{{l}^{-1}}\] done clear
  C)
                  Graphite is the stabler allotrope done clear
  D)
                  Diamond is harder than graphite done clear
  View Solution play_arrow

• question_answer38)
  Enthalpy of formation of two compounds x and y are ? 84 kJ and ? 156 kJ respectively. Which of the following statements is correct     [CBSE PMT 2001]
  A)
                  x is more stable than y done clear
  B)
                  x is less stable than y done clear
  C)
                  Both x and y are unstable done clear
  D)
                  x and y are endothermic compounds done clear
  View Solution play_arrow

• question_answer39)
  For the process dry ice \[\xrightarrow{{}}\,C{{O}_{2}}(g)\]            [KCET 2000]
  A)
                  \[\Delta H\] is positive while \[\Delta \rho \] is negative done clear
  B)
                  Both \[\Delta H\] and \[\Delta \rho \] are negative done clear
  C)
                  Both \[\Delta H\] and \[\Delta \rho \] are positive done clear
  D)
                  \[\Delta H\] is negative while \[\Delta \rho \] is positive done clear
  View Solution play_arrow

• question_answer40)
  For melting of 3 moles of water at \[{{0}^{o}}C\] the \[\Delta {{G}^{o}}\] is [MP PMT 2001]
  A)
                  Zero       done clear
  B)
                  + ve done clear
  C)
                  ? ve        done clear
  D)
                  Unpredictable done clear
  View Solution play_arrow

• question_answer41)
  The equilibrium constant of a reaction at \[298\,K\] is \[5\times {{10}^{-3}}\] and at \[1000\,K\] is \[2\times {{10}^{-5}}\]. What is the sign of \[\Delta H\] for the reaction     [Pb. CET 1998]
  A)
                  \[\Delta H=0\]   done clear
  B)
                  \[\Delta H\] is negative done clear
  C)
                  \[\Delta H\] is positive   done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer42)
  Which of the following has lowest fusion temperature [MP PET 2003]
  A)
                  Naphthalene     done clear
  B)
                  Diamond done clear
  C)
                  NaCl      done clear
  D)
                  Mn done clear
  View Solution play_arrow

• question_answer43)
  Consider the reactions                 \[C(s)+2{{H}_{2}}(g)\to C{{H}_{4}}(g),\Delta H=-x\,kcal\]                 \[C(g)+4H(g)\to C{{H}_{4}}(g),\,\Delta H=-{{x}_{1}}\,kcal\]                 \[C{{H}_{4}}(g)\to C{{H}_{3}}(g)+H(g),\,\Delta H=+y\,kcal\]                 The bond energy of \[C-H\] bond is         [JIPMER 1997]
  A)
                  \[y\,kcal\,mo{{l}^{-1}}\]                done clear
  B)
                  \[{{x}_{1}}\,kcal\,mo{{l}^{-1}}\] done clear
  C)
                  \[x/4\,kcal\,mo{{l}^{-1}}\]           done clear
  D)
                  \[{{x}_{1}}/4\,kcal\,mo{{l}^{-1}}\] done clear
  View Solution play_arrow

• question_answer44)
  Given the bond energies \[N\equiv N,\,\,H-H\] and \[N-H\] bonds are \[945,\,436\] and \[391\,kJ\,mol{{e}^{-1}}\] respectively, the enthalpy of the following reaction \[{{N}_{2}}(g)+3{{H}_{2}}(g)\to 2N{{H}_{3}}(g)\] is [EAMCET 1992; JIPMER 1997]
  A)
                  \[-93\,kJ\]           done clear
  B)
                  \[102\,kJ\] done clear
  C)
                  \[90\,kJ\]             done clear
  D)
                  \[105\,kJ\] done clear
  View Solution play_arrow

• question_answer45)
  The relation between \[\Delta G\] and \[E\] for a cell is \[\Delta G=-nFE\]; the cell reaction will be spontaneous if                [MP PET 1995]
  A)
                  \[G\] is negative               done clear
  B)
                  \[G\] is positive done clear
  C)
                  \[E\] is negative                done clear
  D)
                  \[E\] is positive done clear
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• question_answer46)
  Which of the following is not a correct statement? [AMU (Engg.) 2002]
  A)
                  When \[\Delta G\] is negative, the process is spontaneous done clear
  B)
                  When \[\Delta G\] is zero, the process is in a state of equilibrium done clear
  C)
                  When \[\Delta G\] is positive, the process is non-spontaneous done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer47)
  If at 298 K the bond energies of \[C-H,\,C-C,\] \[C=C\] and \[H-H\] bonds are respectively 414, 347, 615 and 435 kJ \[mo{{l}^{-1}}\], the value of enthalpy change for the reaction \[{{H}_{2}}C=C{{H}_{2}}(g)+{{H}_{2}}(g)\to {{H}_{3}}C-C{{H}_{3}}(g)\] at 298 K will be   [AIEEE 2003]
  A)
                  + 250 kJ done clear
  B)
                  ? 250 kJ done clear
  C)
                  + 125 kJ done clear
  D)
                  ? 125 kJ done clear
  View Solution play_arrow

• question_answer48)
  The equation                 \[\frac{1}{2}{{H}_{2}}+\frac{1}{2}C{{l}_{2}}\to HCl\] (\[\Delta {{H}_{298}}=-22060\,kcal\]) means [CMC Vellore 1991]
  A)
                  The heat absorbed when one gram molecule of \[HCl\] is formed from its elements at \[{{25}^{o}}C\] is 22.060 kcal done clear
  B)
                  The heat given out when one gram molecule of \[HCl\] is formed from its elements at 298 K is 22.060 kcal done clear
  C)
                  The heat absorbed when one atom of hydrogen reacts with one atom of chlorine to form one molecule of  \[HCl\] at \[{{25}^{o}}C\] and one atmospheric pressure is 22.060 kcal done clear
  D)
                  The heat absorbed when one gram equivalent of \[HCl\] is formed from its elements at 298 K is 22.060 kcal done clear
  E)
                  The intrinsic heat of one molecule of \[HCl\] is 22.060 kcal more than the intrinsic heats of one atom of hydrogen and one atom of chlorine done clear
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• question_answer49)
  The \[{{H}_{2}}O(g)\] molecule dissociates as                 (i)  \[{{H}_{2}}O(g)\to H(g)+OH(g);\,\Delta H=490\,kJ\]                 (ii) \[OH(g)\to H(g)+O(g);\,\Delta H=424\,kJ\]                 The average bond energy (in kJ) for water is
  A)
                  490         done clear
  B)
                  424 done clear
  C)
                  914         done clear
  D)
                  914/2 done clear
  View Solution play_arrow

• question_answer50)
  When \[50c{{m}^{3}}\] of \[0.2\,N\,{{H}_{2}}S{{O}_{4}}\] is mixed with \[50c{{m}^{3}}\] of \[1\,N\,KOH\], the  heat liberated is          [KCET 2004]
  A)
                  11.46 kJ done clear
  B)
                  57.3 kJ done clear
  C)
                  573 kJ    done clear
  D)
                  573 J done clear
  View Solution play_arrow

• question_answer51)
  Following reaction occurring in an automobile \[2{{C}_{8}}{{H}_{18}}(g)+25{{O}_{2}}(g)\to 16C{{O}_{2}}(g)+18{{H}_{2}}O(g).\] The sign of \[\Delta H,\,\Delta S\] and \[\Delta G\] would be               [CBSE PMT 1994; KCET 1999]
  A)
                  +, ?, +   done clear
  B)
                  ?, +, ? done clear
  C)
                  ?, +, +   done clear
  D)
                  +, +, ? done clear
  View Solution play_arrow

• question_answer52)
  For the reaction \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\,\,\to \,\,{{H}_{2}}O(l),\,\Delta H=-285.8\,\,kJ\,\,mo{{l}^{-1}}\]\[\Delta S=-0.163\,kJ\,mo{{l}^{-1}}{{K}^{-1}}.\] What is the value of free energy change at \[{{27}^{o}}C\] for the reaction?                 [KCET 1999]
  A)
                  \[-236.9\,kJ\,mo{{l}^{-1}}\]         done clear
  B)
                  \[-\,281.4\,kJ\,mo{{l}^{-1}}\] done clear
  C)
                  \[-\,334.7\,kJ\,mo{{l}^{-1}}\]      done clear
  D)
                  \[+334.7\,kJ\,mo{{l}^{-1}}\] done clear
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