JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank

done Activation energy, Standard free energy and Degree of dissociation and Vapour density Total Questions - 9

• question_answer1)
  The vapor density of completely dissociated \[N{{H}_{4}}Cl\]  would be                                 [NCERT 1974]
  A)
                  Slight less than half that of                                                                                         \[N{{H}_{4}}Cl\] done clear
  B)
                  Half  that of                                                                                         \[N{{H}_{4}}Cl\] done clear
  C)
                  Double that of                                                                                         \[N{{H}_{4}}Cl\]   done clear
  D)
                  Determined by the amount of solid                                                                                         \[N{{H}_{4}}Cl\]  in the experiment done clear
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• question_answer2)
  In an equilibrium reaction for which                                                                                   \[\Delta {{G}^{0}}=0\] , the equilibrium constant                                                                                                   \[K=\]                                                 [BHU 1987]
  A)
                  0              done clear
  B)
                  1 done clear
  C)
                  2              done clear
  D)
                  10 done clear
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• question_answer3)
  For a system in equilibrium                                                                                          \[\Delta G=0\]  under conditions of constant                                     [KCET 1992, 2005]
  A)
                  Temperature and pressure done clear
  B)
                  Temperature and volume done clear
  C)
                  Energy and volume done clear
  D)
                  Pressure and volume done clear
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• question_answer4)
  A reaction attains equilibrium when the free energy change accompanying it is  [KCET 1989]
  A)
                  Positive and large            done clear
  B)
                  Zero done clear
  C)
                  Negative and large          done clear
  D)
                  Negative and small done clear
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• question_answer5)
                                                                 \[\Delta {{G}^{0}}(HI,\,g)\cong +1.7\,kJ\] . What is the equilibrium constant  at                                                                                          \[{{25}^{o}}C\]  for                                                                                               \[2HI(g)\]  D                                                                             \[{{H}_{2}}(g)+{{I}_{2}}(g)\]                 [KCET 1992]
  A)
                  24.0        done clear
  B)
                  3.9 done clear
  C)
                  2.0          done clear
  D)
                  0.5 done clear
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• question_answer6)
  The standard state gibbs free energy change for the given isomerization reaction cis-2-pentene ⇌ trans ?2 -pentene is                                                                                        \[-3.67\,kJ/mol\]  at \[400K\]. If more trans-2-pentene is added to the reaction vessel, then [CBSE PMT 1995; BHU 1999; AFMC 2000]
  A)
                  More cis ?2?pentene is formed done clear
  B)
                  Equilibrium is shifted in the forward direction done clear
  C)
                  Equilibrium remains unaffected done clear
  D)
                  Additional trans?2?pentene is formed done clear
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• question_answer7)
  In a reversible reaction, the catalyst        ­­[KCET 2003]
  A)
                  Increases the activation energy of the backward reaction             done clear
  B)
                          Increases the activation energy of the forward reaction done clear
  C)
                  Decreases the activation energy of both, forward and backward reaction done clear
  D)
   Decreases the activation energy of forward reaction done clear
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• question_answer8)
  For the reaction                                             \[{{H}_{2}}(g)+{{I}_{2}}(g)\] ⇌                                                                                               \[2HI(g)\] ,  the equilibrium constant changes with [IIT 1981; MNR 1983, 85; NCERT 1984; MP PMT 1987, 97; MP PET/PMT 1988; CPMT 1976, 90; UPSEAT 2000]
  A)
                  Total pressure done clear
  B)
                  Catalyst done clear
  C)
                  The amounts of                                                                                            \[{{H}_{2}}\]  and                                                                                             \[{{I}_{2}}\]  taken done clear
  D)
                  Temperature done clear
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• question_answer9)
  Calculate                                                                                      \[\Delta G{}^\circ\] for conversion of oxygen to ozone                                                                     \[3/2\ {{O}_{2}}(g)\to {{O}_{3}}(g)\] at 298 K, if                                                                                            \[{{K}_{p}}\] for this conversion is                                                                              \[2.47\times {{10}^{-29}}\]                 [DPMT 2004]
  A)
                                                                                  \[163\ kJ\ mo{{l}^{-1}}\] done clear
  B)
                                                                 \[2.4\times {{10}^{2}}\ kJ\ mo{{l}^{-1}}\] done clear
  C)
                                                                                 \[1.63\ kJ\ mo{{l}^{-1}}\]                                                                               done clear
  D)
                                                                \[2.38\times {{10}^{6}}\ kJ\ mo{{l}^{-1}}\] done clear
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