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  3. 11th Class
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11th Class Chemistry Sample Paper Chemistry Sample Paper-1

  • question_answer
    The heat of combustion of \[{{C}_{x}}{{H}_{y'}}\]carbon and hydrogen are a, b and c cal respectively. The heat of formation of \[{{C}_{x}}{{H}_{y}}\] will be

    A)  \[-\left( xb+\frac{yc}{2}+\frac{a}{2} \right)cal\]

    B)  \[-\left( xb+\frac{yc}{2}-a \right)cal\]

    C)  \[\left( xb-\frac{yc}{2}+\frac{a}{2} \right)cal\]

    D)  \[\left( xb-\frac{yc}{2}-\frac{a}{2} \right)cal\]

    Correct Answer: B

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