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NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    The "thermite reaction' involving the reaction between ferric oxide and metallic aluminium produces molten iron. Given that \[2A1+3/2{{O}_{2}}\to A{{l}_{2}}{{O}_{3}};\Delta {{H}_{1}}=-400\,kcal/mol\] \[2Fe+3/2{{O}_{2}}\to F{{e}_{2}}{{O}_{3}};\Delta {{H}_{2}}=-200\,kcal/mol.\] What is \[\Delta H\] for the formation of 1 mole of iron?

    A) \[-100kcal\]

    B) \[-200\text{ }kcal\]

    C) \[+100\text{ }kcal\]      

    D) \[+200\text{ }kcal\]

    Correct Answer: A

    Solution :

    [a] I-II. gives, \[2Al+F{{e}_{2}}{{O}_{3}}\to 2Fe+A{{l}_{2}}{{O}_{3}}\] we have \[-400-\left( -200 \right)=-200\]; For one mole of iron the value is \[-100\] cal


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