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NEET Sample Paper NEET Sample Test Paper-83

  • question_answer
    The free energy change for the following reactions are given below \[{{C}_{2}}{{H}_{2}}(g)+\frac{5}{2}{{O}_{2}}(g)\xrightarrow{{}}\,\,2C{{O}_{2}}(g)+{{H}_{2}}O(l)\]\[\Delta G{}^\circ =-\,394\,J\] \[C(s)+{{O}_{2}}(g))\,\,\xrightarrow{{}}\,\,C{{O}_{2}}(g);\]\[\Delta G{}^\circ =-1234\,J\] \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\xrightarrow{{}}\,\,{{H}_{2}}O\,(l)\] \[\Delta G{}^\circ =-237\,kJ\] Calculate the standard free energy change for the reaction? \[{{\operatorname{H}}_{2}}\left( g \right)+2C\left( s \right) \xrightarrow{{}}\,\,{{C}_{2}}{{H}_{2}}\left( g \right)\]

    A)  - 2259 kJ                     

    B)  209 kJ

    C)  +2259 kJ                    

    D)  - 209 KJ

    Correct Answer: B

    Solution :

    \[{{C}_{2}}{{H}_{5}}+\frac{5}{2}{{O}_{2}}(g)\xrightarrow{{}}2C{{O}_{2}}+{{H}_{2}}O\] \[\Delta G{}^\circ =\,\,-1234\,kJ\]                                   ... (i) \[\operatorname{C}\,+\,\,{{O}_{2}}\,\xrightarrow{{}}\,\,C{{O}_{2}}\,\,\,\Delta G{}^\circ =\,\,-394\,kJ\]   ... (ii) \[\operatorname{H}+\frac{1}{2}{{O}_{2}}\,\,\xrightarrow{{}}\,{{H}_{2}}O\,\,\,\Delta G{}^\circ =-\,237kJ\]        ? (iii) Eq.,\[\left( ii \right)\times 2+Eq.\left( iii \right)-Eq.\left( i \right)\] \[\Delta G{}^\circ =2\left( -\,394 \right)+\left( -\,237 \right)-\left( \,-1234 \right)\] \[\Delta G{}^\circ =209kJ\]


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