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CMC Medical CMC-Medical Ludhiana Solved Paper-2015

  • question_answer
    For the reaction \[C+{{O}_{2}}\xrightarrow{{}}C{{O}_{2}},\]what are the signs of \[\Delta H\] and \[\Delta S\]respectively?

    A)  Positive, negative

    B)  Negative, positive

    C)  Negative, negative

    D)  Positive, positive

    Correct Answer: B

    Solution :

                    In the given reaction, one molecule is formed from one carbon gaseous atom and one oxygen molecule. Energy is released with the bond formation.  Therefore, \[\Delta H\] is negative.  The molecules with more atoms have greater entropy, therefore \[\Delta S\]is positive.


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