2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Thermodynamics / रासायनिक उष्मागतिकी

JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Heat of reaction

  • question_answer
    \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to {{H}_{2}}O;\,\Delta H=-68.39\,kcal\]                 \[K+{{H}_{2}}O+\]Water \[\to KOH(aq)+\frac{1}{2}{{H}_{2}};\,\Delta H=-48\,kcal\]                 \[KOH+\]Water \[\to KOH(aq);\,\Delta H=-14\,kcal\]                 The heat of formation of \[KOH\] is (in kcal)        [CPMT 1988]

    A)                 \[-68.39+48-14\]              

    B)                 \[-68.39-48+14\]

    C)                 \[68.39-48+14\]               

    D)                 68.39 + 48 + 14

    Correct Answer: B

    Solution :

           Aim: \[{{K}_{(S)}}+\frac{1}{2}{{O}_{2}}_{(g)}+\frac{1}{2}{{H}_{2(g)}}\to KO{{H}_{(S)}}\]            eq. (ii) + eq. (i) ? eq. (iii) gives                                 \[\Delta H=-48+(-68.39)-(-14)\]\[=-68.39-48+14\].


You need to login to perform this action.
You will be redirected in 3 sec spinner