KVPY Sample Paper KVPY Stream-SX Model Paper-21

  • question_answer
    (i) \[C(graphite)+{{O}_{2}}(g)\to C{{O}_{2}}(g):\Delta r{{H}^{\circ }}=xKJmo{{l}^{-1}}\]
    (ii) \[C(graphite)+\frac{1}{2}{{O}_{2}}(g)\to CO(g):\Delta rH{}^\circ =ykJmo{{l}^{-1}}\]
    (iii) \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\to CO(g):\Delta rH{}^\circ =z\,kJ\,mo{{l}^{-}}\]
    Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct?

    A) \[x=y+z\]

    B) \[z=x+y\]

    C) \[y=2z-x\]

    D) \[x=y-z\]

    Correct Answer: A

    Solution :

    (ii) + (iii) = (ii) y + z =x.

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