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BCECE Engineering BCECE Engineering Solved Paper-2005

  • question_answer
    Oxidation number of S in\[SO_{4}^{2-}:\]

    A) + 6                                         

    B) + 3

    C) + 2                         

    D)        - 2

    Correct Answer: A

    Solution :

    Key Idea: The sum of oxidation states of at elements in an ion is equal to charge on it. Let the oxidation state of S in \[SO_{4}^{2-}=x\]                 \[\therefore \]  \[x+(-2\times 4)=-2\]                 or            \[x=+\,6\]


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