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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    For the complete reduction of a molecule of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]the number of electrons are required

    A)  3               

    B)  4

    C)  5               

    D)  6

    Correct Answer: D

    Solution :

     Six electrons are required for the complete reduction of a molecule of\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}.\] \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{-}}+6{{e}^{-}}\xrightarrow[{}]{{}}2C{{r}^{3+}}+7{{H}_{2}}O\]


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