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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]
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]
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]
question_answer4) Which one of the following bonds has the highest average bond energy (kcal/mol) [CPMT 1994]
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]
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]
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]
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]
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]
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]
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