JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank

done Bond energy Total Questions - 10

• question_answer1)
  If the bond dissociation energies of \[XY,\,{{X}_{2}}\]and \[{{Y}_{2}}\] (all diatomic molecules) are in the ratio of 1 : 1 : 0.5 and \[{{\Delta }_{f}}H\] for the formation of \[XY\] is \[-200\,kJ\,mol{{e}^{-1}}\]. The bond dissociation energy of \[{{X}_{2}}\] will be         [AIEEE 2005]
  A)
                  \[100\,kJ\,mo{{l}^{-1}}\]               done clear
  B)
                  \[800\,kJ\,mo{{l}^{-1}}\] done clear
  C)
                  \[300\,kJ\,mo{{l}^{-1}}\]               done clear
  D)
                  \[400\,kJ\,mo{{l}^{-1}}\] done clear
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• question_answer2)
  Energy required to dissociate 4 gm of gaseous hydrogen into free gaseous atoms is 208 kcal at \[{{25}^{o}}C\]. The bond energy of \[H-H\] bond will be [CPMT 1989; MP PET 2000; J & K 2005]
  A)
                  104 kcal                done clear
  B)
                  10.4 kcal done clear
  C)
                  1040 kcal              done clear
  D)
                  104 cal done clear
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• question_answer3)
  The bond dissociation energy needed to form benzyl radical from toluene is ..... than the formation of the methyl radical from methane    [IIT 1994]
  A)
                  Less       done clear
  B)
                  Much done clear
  C)
                  Equal     done clear
  D)
                  None of the above done clear
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• question_answer4)
  Which one of the following bonds has the highest average bond energy (kcal/mol)         [CPMT 1994]
  A)
                  \[S=O\]                done clear
  B)
                  \[C\equiv C\] done clear
  C)
                  \[C\equiv N\]    done clear
  D)
                  \[N\equiv N\] done clear
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• question_answer5)
  The bond dissociation energies of gaseous \[{{H}_{2}},\,C{{l}_{2}}\] and \[HCl\] are 104, 58 and 103 kcal respectively. The enthalpy of formation of \[HCl\] gas would be [MP PET 1997; MP PMT 1999, 2001]
  A)
                  ? 44 kcal               done clear
  B)
                  44 kcal done clear
  C)
                  ? 22 kcal               done clear
  D)
                  22 kcal done clear
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• question_answer6)
  The first ionization energy for Li is 5.4 eV and electron affinity of Cl is 3.61eV. The \[\Delta H\] (in kJ/mol) for the reaction \[Li(g)+Cl(g)\to L{{i}^{+}}+C{{l}^{-}}\] is (if resulting ions do not combine with each other) \[(1\,eV=1.6\times {{10}^{-19}}J)\] [MP PMT 2000, 03]
  A)
                  70           done clear
  B)
                  100 done clear
  C)
                  170         done clear
  D)
                  270 done clear
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• question_answer7)
  Given that \[C(g)+4H(g)\,\to \,C{{H}_{4}}(g);\,\Delta H=-166\,kJ\] The bond energy \[C-H\] will be                                [AMU 2002]
  A)
                  208 kJ/mole done clear
  B)
                  ? 41.6 kJ/mole done clear
  C)
                  832 kJ/mole done clear
  D)
                  None of these done clear
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• question_answer8)
  The \[H-H\] bond energy is 430 kJ \[mol\] and \[Cl-Cl\] bond energy is \[240\,kJ\,mo{{l}^{-1}}.\,\,\Delta H\] for \[HCl\] is \[-90\,kJ\]. The \[H-Cl\] bond energy is about [BVP 2003]
  A)
                  \[180\,kJ\,mo{{l}^{-1}}\]               done clear
  B)
                  \[360\,kJ\,mo{{l}^{-1}}\] done clear
  C)
                  \[213\,kJ\,mo{{l}^{-1}}\]               done clear
  D)
                  \[425\,kJ\,mo{{l}^{-1}}\] done clear
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• question_answer9)
  If enthalpies of methane and ethane are respectively 320 and 360 calories then the bond energy of \[C-C\] bond is [UPSEAT 2003]
  A)
                  80 calories           done clear
  B)
                  40 calories done clear
  C)
                  60 calories           done clear
  D)
                  120 calories done clear
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• question_answer10)
  If the bond energies of \[H-H\], \[Br-Br\] and \[HBr\] are 433, 192 and 364 \[kJ\,mo{{l}^{-1}}\] respectively, the \[\Delta {{H}^{o}}\] for the reaction, \[{{H}_{2}}(g)+B{{r}_{2}}(g)\to 2HBr(g)\] is [CBSE PMT 2004]
  A)
                  + 261 kJ done clear
  B)
                  ? 103 kJ done clear
  C)
                  ? 261 kJ done clear
  D)
                  + 103 kJ done clear
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